TRS-80:The Million- Your Judgement Thoughtfully

We Take the Mystery Out of Computers.. .

What is a computer? giving you the time to exercise TRS-80:The Million- your judgement thoughtfully. Dollar Breakthrough Not so many years ago, the pocket calculator we now take What Can a Computer Do? TRS-80 systems are capable of for granted could have passed for performing all of these opera- a powerful computer, worth a Large computers are well known tions, and quite a few more not great deal of money. Today, how- in the business world for their mentioned. Although TRS-80 is a ever, there is much more to the ability to do bookkeeping, bdling, small computer, it offers comput- definition of a computer. payroll, inventory control, and ing power that would have cost fast analysis of data. more than a million dollars just a Computers work not only with few years ago. And now there numbers, but with alphanumeric Because computers work with are two TRS-80 systems! -the data-names, words, stock alphanumeric information, they Model I and the all-new Model 11 numbers. A computer can be can sort a mailing list by name, "strictly business" computer. programmed to repeat the same address or other criteria, spot The chart on page 5 will give you I function over and over. It can log- slow-moving inventory items, a feeling for the relative 1; ically evaluate information given write purchase orders based on capabilities of the two systems. B to it, and act on its findings. It sales trends . . . or simply catalog Your nearby Radio Shack store, can store large volumes of data your butterfly collection. Com- authorized dealer or Computer for future use or reference. It can puters can become teachers, lab Center can help you select the converse with its operator. assistants-even entertainers TRS-80 system and accessories that play all lnds of fascinating you need for your particular Obviously, a computer is much games, from chess to space war. application. more than just a "number- cruncher." It is literally an extension of the mind. It is to man's mind what the lever is to hsarm -a machine capable of increas- ing his effectiveness. It can free you from repetitive exercises which do not require human judgement. It can provide facts and figures with extreme speed,

@ 1979Tandy Corporat~on,Fort Worth, Texas 76109. Retatl prices m this catalog may vary at indlmduaf stores and clealers. The Company cannot be l~able fatypographical or plctonal errors What the Expanding World of TRS-80is About. . .

It's About Business It's About Service It's Over 100,000 Systems and the New Model I1 Before and After Sold and TRS-80's 2-Megabyte System. . . You Buy. . . Growing Acceptance as the "Standard" Although thousands of TRS-80 You can order a TRS-80 at over Small Computer Model I systems are used com- 7000 locations worldwide. And mercially some applications re- our 50 new Computer Centers When we introduced TRS-80 quire more memory and hgher are ready to assist you with Model I in 1977, we did not an- speed than Model I offers. after-the-sale training, service ticipate the incredible demand Rather than stretch the expan- and expert advice! for small computers. sion limits of Model I to meet Today, our factories operate these additional requirements, around the clock to meet this Radio Shack designed and built demand, which is still growing. an entirely new computer . . . TRS-80 Model 11. Radio Shack revolutionized the industry by budding affordable Model I1 offers twice the speed of computers (instead of just talk- Model I with memory storage up ing about them). And we're in to 2 mdlion bytes. Model 11 com- the business to stay! pares favorably with systems like IBM's 51 10 -and costs 33% to 66 % less!

a. :4 . -4 r-i Model I1 Systems and Accessories. See Pages 18-23 Blladel I Systems and Accessories. See Pages 6-17 3$ It's the Benefits It's About Value . . . It's About of Modular Design. . . Continuing Support. . . TRS-80 Model I systems start at You can buy the Model I or I1 sys- $499. Last year's price was $599. In addition to the sensational tem that's required for today's The reason for the cut is the effi- Model 11, we've introduced new jobs -and expand later to meet ciency of mass production, and hardware items and many new growing (or changing) needs. we're passing along the savings! software packages for Model I. I Our promise: We'll sell you what TRS-80's traditional economy Radio Shack wants to be your you need, not more, not less, and continues with Model 11, which small computer company and you wi~save money ! provides more power-per-dollar you can be sure of our support than any other small computer! . . . today and tomorrow! Over 100,000 Owners Know TRS-80's

Benefits important side effect -the logi- of the most important to our fam- cal approach to problem solving. ily and to the education of our Small Businesses More TRS-80 systems are used in child that we have ever seen." Save Time and the classroom than any other What's Behind the Cut Costs type of computer! And Radio Success of TRS-80? Shack supports TRS-80 with Small-business owners have teacher guides, course materials Availability TRS-80 Model I is in learned TRS-80 gives them an and service. stock in most Radio Shack stores. effective, yet affordable "head You can see and try one before start" on the competition. Tedi- you buy Model I1 is displayed in ous paperwork like payroll and The Most Popular Radio Shack Computer Centers, inventory can be handled by Personal Computer but you can order from any Radio TRS-80, and this allows a busi- in the World Shack outlet. nessman to spend more time on At home, thousands use TRS-80 It's easy to use. Level I's superb the really productive areas of systems to manage budgets, manual makes learning to pro- his job. catalog valuables, educate and gram fast, simple and fun. And Larger businesses that own (or entertain with fascinating Radio Shack's prerecorded have access to) a full-blown games. Most owners (now well software permits an operator mainframe computer have found over 100,000)regard their TRS-80 with little or no experience to use I TRS-80 is ideal for jobs too small as an investment. A father tells Model I or Model 11 for a variety to be cost effective on the big us his TRS-80 investment "is one of jobs. computer. TRS-80 saves time It's expandable. Even the smallest because it handles small jobs Model I system can be expanded without interrupting the big to our largest Model I business computer's schedule, and there's system. Model 11 expands, just as usually no waiting to use the easily to meet growing or chang- TFB-80 system. ing needs. After the sale. Radio Shack pro- TRS-80 Goes to School vides the answers you need be- Schools everywhere now rely on fore -and after- you buy Our TRS-80 as an aid in teaching Computer Centers offer classes math, language arts, even com- in programming and each has a puter programminq and its very service facility. And we're constantly adding software and accessories to increase the versatility of both Model I and Model II. TRS-80System Selection Guide

Figures refer to Ra&o Shack software Other * Expected quantities for software may give Merent quantities. software to be offered in the near future TRS-80 Model I and Model I1 Specifications The TRS-80 Model I Microcomputer System

Radio Shack's TRS-80 Microcomputer System is fully wired, tested and U.L. Inside the keyboard is listed for electrical safety -you can put it to work immediately! It's ideal for the computer's "brain." finances, education, accounting, lab use -even for home entertainment. And it's the computer with a full line of accessories being delivered now with more A powerful 2-80 microprocessor to come in the future! serves as the central processing unit (CPU).Programs and data Basic TRS-80 systems include a 22" video monitoc Realistic battery/AC cas- are stored in internal "memory sette recorder, power suppl~user's manual and a cassette tape for playing chips." Our lowest-priced TRS-80 , Blackjack and Backgammon. computer contains 4096 bytes , The TRS-80 comes to you ready to be programmed either from prerecorded (4K) of user memory, or RAM (a : cassette tape or from the keyboard. A "program"is simply a set of step-by- byte being roughly equivalent to step instructions telling your TRS-80 what you want it to do. The TRS-80's one typewritten character and programs are written in easy-to-learn, plain-English BASIC programming made up of eight electrical language (BASIC stands for "Beginner's All-purpose Symbolic Instruction signals called "bits").It can be Code" . The Level I user's manual includes a beginner's course in BASIC that '11 expanded to 16K within the I have you "talking" to your computer in no time. keyboard unit and to 48K by i using the Expansion Interface with additional memory options. And now, every new 16K TRS-80 New Lower Prices! includes a calculator-style numeric keypad (available as TRS-80 Model I an option on 4K computers). Systems Now Low As Note: the 2-80 is an 8-bit microprocessor and can address a total of 64K of memory. Both ROM and 16K Model Level I 4K RAM are addressed in the TRS- Pictured 80, along with some internal "overhead." In a 48K RAM configuration, the last memory address is 65,535 -the usual ending address for a 64K computer. The "Read-only Memory" chips contain the "BASIC interpreter" software. The interpreter ac- for Business, Education or Personal Use

cepts plain-English commands and statements from the programmer and translates them into the numeric language of the 2-00. You can access the Z-80's numeric "machine language" directly by using our "T-Bug" monitor program, available on cassette tape, or in "assembly language" by using our "EditodAssembler" tape. (Both of these tapes are suggested only for advanced programmers with a knowledge of machine and assembly language.) The Realistic cassette recorder lets you record and play your countries and are sold only over- System Prices own programs or use one of seas by Tandy Electronics out- Level I 4K. 26-1051 ...... 499.00 Radio Shack's prepared pro- lets. The computer cannot be Level I 16K. 26-1053 . . . . . 729.00 grams -simply run the cassette connected directly to a standard Level I1 4K. 26-1054 ...... 619.00 and begin computing. Other re- TV set. Level I1 16K. 26-1056 . . 849.00 corders may be used-with varying degrees of success-but only For access to other hardware, if they have automatic the TRS-80 utilizes a unique recording level capability. 40-pin bus (connector system) Specifications that can attach the TRS-80 to our The video monitor looks like a Expansion Interface, or other ex- Microprocessor: Advanced 2-80 standard television set without ternal devices. 8-bit processor. Clock speed, the channel selector. It features a 1.78 MHz. wider bandwidth than most TV Housed in the finest ABS@mate- Keyboard: Integrated, full-size, sets for a sharper display of print- rial, the TRS-80 is virtually un- 53-Key professional-type. ing and graphics. The monitor breakable. It may be left "on" for Video Display: Memory mapped, all operates on ordinary 120-volt extended periods of time with no graphics and alphanumerics con- AC, 60 Hz house current. Foreign adverse effects, as long as the trolled by BASIC commands. Cursor versions are available in other cooling vents are not obstructed. control. Automatic scrolling. Text: 16 lines of up to 64 characters with Level I. With Level 11, you may select an optional mode of 32 Inside Your TRS-80 characters per line. Graphics: 128 horizontal by 48 vertical. Graphics and text can be combined in any manner by software. Memory: Includes 4K or 16K Read- Only Memory (ROM),4K or 16K Ran- dom Access Memory (RAM). Input/Output: Computer-controlled cassette interface. Expansion port built-in. Power: Power Supply; 120VAC, 60 Hz, 50 watts. Video Monitor; 120VAC 60 Hz, 50 watts. Both U.L. listed for electrical safety. Dimensions: Keyboard, 16l/2~8x3'/2 1' Video Display, 161/2~13~/2x121'Power Supply, 2 5/8~2Y3x3l/4 1'

ABS' is a trademark of Borg Warner Choose from Two Versions of BASIC Language 1 Level I BASIC More Powerful Level I is a simplified version of Level I1 BASIC programing language. Our Level 11 is an advanced version of outstanding owner's manual lets BASIC. It offers vastly increased you learn how to program quickly computing power and additional andeady-evenifyouhaveno features as indicated below. Note prior knowledge of computers or that Level 11 intrinsic functions re- programming. Level I includes video main at 6-digit accuracy. .A detailed arapbics,250-baud cassette in- 140-pagemanual is included.Level TI I includes 23 specific error codes iut/output, floating point arithmetic. numelic arrax limited string- which can also be used to generate variables and co-and an error in order to test err& abbreviations. trapping routines.

Feature Comparison Language Comparison (Cont'd) Chart LEFT$(A$) Chart LEN(A$) FEATURE LEVEL I LEVEL 11 LET COMMAND LEVEL I LEVEL I1 Array Dimensions One No limit LIST Array names A(X) Anyr ABS (XI LLIST numeric ASC (A$) LOG(A) variable ATN(X) LPOS(0) name AUTO LPRINT Auto line number No Yes CDBL (XI MEM X CHR$(X) MID$(A$,X,Y) Cassette Speed 250Baud 50OBaud CINT(X) NEW X Compressed Prag. CLEAR NOT Storage No Yes CLEAR(X) ON X Command CLOAD ONERROR GOT0 OUT X,Y Abhreyiations Yes No CLOAD? Disk Capability No Yes CLOAD (FILE) PEEK (X) CLS POINT (X,Y) Error Codes 3 23 POKE X,Y Error Trapping No Yes CONT COS(X) POS(X) Editing NQ Yes CSAVE PRINT PRINT AT Execution time (L-II 39%faster CSAVE (FILE) PRINT@ than L-I) CSNG(X) PRINTUSING Formatted Print No Yes DATA DEFDBL PRINT# Keyboard rollover No Yes RANDOM DEFINT Logmal line lgth. 64 Char. 255 Char. READ DEFSNG REM Multi Statement DEFSTR prog. hes Yes Yes RESET(X,Y) DELETE RESTORE Named files No Yes DIM RESUME Numeric accuracy: EDIT RETURN Single precision 6 Digits 6 Digits ELSE RIGHT$(A$,X) END Double precision - 16 Digits ERL RND(1) RND(X) Numeric Variable A-Z A-Z,AA-ZZ ERR RUN Names Al-Z9 ERROR(X) Port Access No Yes EXP(X) hinter Commands NO Yes FWXJ Bog. line lgth. 64 Char. 255 Char. FOR-NEXT-STEP FRE(A$) ROM size 4K 22K FRE(0) Screen Format 16x 64 28 x 64 or GOSUB 16x32 GOT0 String length 16 Char. 255 Char, IF-THEN INKEY$ String names M,B$ Any numeric INP (XI variable name INPUT Tracing No Yes mu?'# INPUT#-X Variables names 1Char. Multi-char., INTW 8 (2 Sigmficant) TRS-80Model I Accessories You Will Want! System Dust Covers Level I1 BASIC NEW (ROM) Kit When you've mastered Level I pro- MODEL gramming language, you can move up to higher computing power with Level II. Conversionis easy -we simply exchange the ROM chips in your TRS-80 for chips containing Level II. Your local Radio Shack store can arrange for the exchange. Incor- Keep your system in top condition porate Level 11 into your 4K or 16K when it's not in use. Custom vinyl TRS-80 System RAM Level I TRS-80. covers fit snugly over systems, disk 26-1120 ...... 120.00 drives or line printers. Carrying Case Set System Cover. 26-501 ...... 7.95 Take your TRS-80 system with you 2-Pack Disk Drive Covers. wherever you go! One case holds Calculator-Style 26-502 ...... 5.95 the video monitor, the other holds Entries with the Printer Cover (for 26-1150 or 26-1152). the keyboard unit, power supply, Numeric Keypad 26-503 ...... 5.95 cassette recorder, cables and cas- -- settes. Black molded vinyl. Hand carry only-not designed for ship- ping purposes. 790° 26-500 ...... 69.00 Makes entering data a lot faster when you're used to using a standard calculator. Enter by either the keypad or typewriter keyboard TRS-80Manuals numerals. Level I User's Manual 26-1103 ...... 79.00 Dual-Section TRS-80 Our Level I manual is intended for the novice. It's a teaching manual 16K Memory Power Line Filter whose humorous, easy-to-read (RAM)/Keypad Limits AC power line interference to style makes learning fun. 232 Kit Increases TRS-80's your TRS-80 Model I system. The pages explaining the capabilities Internal Memory same outstanding filter we built into of the computer. Included with Model 11, including built-in dual, iso- TRS-80 systems or available sepa- The TRS-80 is designed for easy lated filters -one for the computer rately upgrading to a full 16K of RAM system and one for the accessory 62-2016 ...... 5.95 memory inside the keyboard unit. items. Contains 8 outlets all con- Your nearest Radio Shack store can Level I1 Reference Manual trolled by a single switch. U.L.listed. arrange for the exchange of your 4K 26-1451 ...... 39.00 This manual is included with for 16K chips and add the keypad. Level II equipment and Level 11 26-1101 ...... 230.00 conversions or is available separately 140 pages of invaluable ref- erences. Assumes the reader is TRS-80 familiar with Level I programming. Certified 26-2102 ...... 5.95 Cassettes DOWDisk BASIC Manual C-20 digital computer cassettes are A complete reference manual for ideal for storing all of your important the TRS-80 Disk Operating Sys- programs. These tapes are VidedProgram tem and Disk BASIC. Included leaderless and individually tested to with our Mini-Disk system or insure against loss of any data. Worksheets available separately 26-301 ...... 3.49 Each package contains two pads of 26-2104 ...... 5.95 50 two-sided sheets. One side is a proportional Model I screen layout TRS-80 Technical Manual Quantity Savings on chart for designing graphics or print We have gathered the schemat- Cassettes locations. The other side is a pro- ics, logic and timing diagrams for Quantity Price Each gramming worksheet with space for Level I and Level 11 plus easy-to- 1-11 3.49 program lines and variable names or read sections on circuit theory 12-23 3.09 comments. and circuit description. 24-47 2.69 26-2105 ...... 2.95 26-2103 ...... 9.95 48-up 2.29 The Keys to a More Powerful TRS-80

TRS-80 Expansion The controllers for (electronic cir- Voice Synthesizer Interface cuits needed to control) up to four TRS-80 Mini Disk drives, a printer Now you can program your TRS-80 Expansion is a key word in the to speak. It's not a pre-recorded TRS-80 philosophy The TRS-80's and dual cassette recorders are an integral part of the Expansion Inter- human voice, but electronically modular design lets you expand to "synthesized" speech projected just the system you want. Of course, face, as are the provisions for an extra 16K or 32K of optional RAM. through a built-in speaker. It plugs you can add 16K RAM and Level I1 into your TRS-80's bus connector on BASIC to the keyboard unit. Beyond keyboard or Expansion Interface. that point, the Expansion Interface Programming spoken words is done becomes the hub of expanded The printer output port is a standard Centronics parallel circuit. This par- by typing combinations of some 60 TRS-80 computer systems. "phonemes" representing spoken allel port and our RS-232-C serial sounds. Requires Level I or 11-16K The Expansion Interface measures port allow connection of a variety of RAM preferred. I peripheral devices. Pin-out informa- 4Y2 xl6Y2 x8" and is designed to sit 26-1180 ...... 399.00 1 directly under the video monitor act- tion is provided in the owner's man- ing as a base for it. The TRS-80's ual. Each requires 120VAC, 6OHz, 50 power supply module, and an iden- watts. U.L. listed. tical one for the interface, are Experiment with "voice recognition" housed inside the interface enclo- on your TRS-80. That's right, speak sure. Space is also provided for our into a microphone attached to the optional RS-232-C Serial Inter- Expansion Interface with 0 RAM. VOXBOX and you can program your face Board. 26-1140 ...... 299.00 TRS-80 to respond to your spoken Expansion Interface with 16K RAM. words. A cable approximately 6" long con- 26-1141 ...... 448.00 nects the interface to the TRS-80 bus connector. The interface pro- Expansion Interface with 32K RAM. Computer voice recognition is a new vides output connectors for our 26-1142 ...... 597.00 field, and not fully developed, but TRS-80 printers, disk drives, dual 16K RAM Memory Expansion Kit. here's your chance to experiment cassette recorders, and an RS-232-C 26-1102 ...... 149.00 with this exciting new technology. serial port, as well as an extension Cassette Recorder. Level 11 required. of the TRS-80 bus. 26-1205 ...... 49.95 26-1181 ...... 169.95

Voice Synthesizer

VOXBOX Desks and Communications for Your TRS-80

TRS-80 Telephone Interface I1 This is the fast way to transfer data from one location to another-by telephone with the Telephone Inter- face 11. It's a full "originate/answer" acoustic coupler which allows two TRS-80's to talk to each other. You can also communicate with another computer which has "originate only" capability (like our Telephone Inter- face I.) You can pass all types of data or programs between computers, or one of you can operate the other's computer via the telephone lines. No direct connection to the telephone line is require'

TRS-80 System Desk Space-Saver Stand Attractive and functional. Keyboard only 373/4x233/4",but holdS a and Expansion Interface fit into de- TRS-80,cassette recorder, CRT, EX- skto~,with wiring pansion Interface, Quick Printer and concealed. A bay under the desk can singleor dual disk drives. Space- It's very simple to operate. JU~LU L ~ house from one to four Mini Disk Saver was designed to hold your the phone number at the location of drive units. Add a Quick Printer and TR~-O~system and stillleave ample the TRS-80 you desire to communi- there's plenty of workspace left. room for work. The low-cost answer cate with; after the connection is 27x48~27". for home or educational users. made, each telephone handset is 26-1301 ...... 199.00 26-1304 ...... 49.95 placed on its interface. Now you're Auxiliary fan kit for the bay ready to receive and transmit data. Requires RS-232 Serial Interface Card, Expansion Interface, RS-232 Communications Package and Level 11. Adds versatility to your TRS-80. RS-2324 Serial 26-1171 ...... 199.00 Interface Board 990° Specifications You can let your TRS-80 communi- Baud Rate: up to 300. Mode: Originate and cate with the "outside world" by receive, half or full duplex. Receive Sensitiv- ity: -45 dBm. Power Requirement: 24 Volts using our TRS-80 RS-232-C Serial 4C, 150 mA, supplied by U.L.listed AC Interface Board. It lets you connect ~dapter. the TRS-80 to a variety of accessories such as modems, card Communications readers, line printers and acoustic couplers. TRS-80RS-232-C Specifications Baud Rate: Switch selectable in 8 steps from The RS-232-C board mounts inside 110 to 9600 baud. Software controllable m 16 steps from 50 to 19,200 baud.Stop Bits: our Expansion Interface. A cable is Selectable 1or 2. Wordlength: Selectable 5 to provided for connection to external 8 bits. Data In/Data Out Ports: Switch revers- equipment such as Radio Shack's Ible. Logic State Sensing: Clear to send, Data Telephone Interface or perhaps your Set Ready, Carrier Detect, Ring Indicator. Software package used with Tele- Software Controllable Outputs: Data Terminal own serial line printer. Included is a Ready, Request to Send. Software Control: All phone Interface I1 allowing the comprehensive user's manual and a functions except Data Inmata Out reversmg TRS-80 to communicate with cassette tape program which allows are fully software controllable. another TRS-80 as a host terminal the TRS-80 to act as an interactive combination. Also lets you transfer terminal for communication with a Terminal Program programs between TRS-80s. Con- remote time-sharing computer Comes with tains 5 cassettes. 16K Level 11 re- system. RS-232-C Board quired. 26-1145 ...... 99.00 26-1146 ...... 29.9! TRS-80Mini-Disk System-Fast, Efficient Mass Storage

Store Large Amounts of Data The system diskette containing TRSDOS U.BI --, 5y4-bch andProganuforALPorrt and Disk BASIC must always be in your Magnetic Mini-Dmet- Instant Acceu first drive unit. TRSDOS allows you to copy a diskette (BACKUP) even in a one Radio Shack's mini-diskettes are perfect The TRS-80 Mini-Disk system is a stor- drive system. For Mini-Disk drive I, order for use with our mini-disk System. Each age medium allowing immediate access 26-1160, 499.00. For Mini-Disks 11, III or diskette is individually certified against to the large amounts of data and pro- order 26-1161,499.00 each. defects and designed to meet TRS-80 grams you will need for accounting, in- standards. Extensive testing assures ventory control, mailing lists and other 100%compatibility. Available sinalv--.z-, jobs. Up to 4 drives can be attached as 26-0305, 5.95, or in a pack of 3 as through the Expansion Interface, fur- 26-0405,16.95. nishing 49,900 to about 307,000 bytes of Quantity Savings on Blank on-line storage. The first Mini-Disk drive Diskettes -3-Packs Only you purchase includes our powerful Quantity Each TRSDOSm (Disk Operating System 1-4 16.95 software) and Disk BASIC on diskette. 5-9 15.95 10-19 13.95 This diskette allows about 50K of user 20-Up 11.95 storage space. TRSDOS and Disk BASIC use about 10K of the TRS-80's RAM, so a minimum of 16K is required, along with Level II and an Expansion Interface. Each of the diskette's 35 tracks consists of ten 256-byte sectors. Certain system Attach Up to4Drives for information and a directory are required On-Line Storage of 307,000 Bytes on each diskette, leaving 85,760 bytes of space available (each) on the second, Specifications third and fourth drive. Disk Format: 35 Tracks; 10 Sectors per Track; A 13,000-byteprogram which takes 256 Bytes per Sector; 89,600 Bytes per Disk- 3% minutes to load from cassette tape ette. Disk Size: 5V4" floppy disk. Data Ransfer Rate: 12,500 bytes-per-second. Diskspeed: Diskette Storage Box (Level II) dload in less than 20 see 300 RPM. Latency: 100 mS (average).Rack onds from disk. And you may read ------Access Time:~~~ 200 mS averaae. 600 mS to Static-free design protects up to 50 information one file after the other cross all 35 tracks.~vera~e>ackupThe: 1:10 minutes (including formatting). Memory Us- mini-diskettes. Adaptable to hold (sequential),or go directly to any sector age: TRSDOS, 4.2K RAM;Disk BASIC, 5.8K cassette tapes. Boxes are stackable. without reading the preceding files RAM.Power: 12OVAC. 60 Hz, 35 watts. U.L. Smoke-tint cover, durable molded (random). listed. Size: 6'/2~3'/zx13~/4" plastic. 6-5/16x10-1~16x7-11/16". 26-1450 ...... 19.95

Note: All accessories in this catalog may not be stocked at some stores and dealers. Powerful Disk BASIC and TRSDOS Operating Systems TRS-80 Mini-Disk System Also File Commands: Provides Powerful Enhancements to Radio Shack's Level I1 BASIC CLOSE -Closes a file which is currentlv. open.- The file must be reopened for use. DISKDUMP -A program to write a disk file to the TRSDOS Programs line printer (or v~deo)sector by sector in hex code and ASCII, 16 bytes at a time. Shows how data formats are stored on a disk. Included in TRSDOS is the software EOF -Function to check for end of file. needed to operate the disk system, plus GET -Reads a specified record from a random file certain programs for file management, into the file's associated buffer. FIELD -Specifies the format of a random file called Utilities. record. INPUT#filenumber -Reads from a sequential file. On power-up, TRSDOS is automatically KILL -Deletes a file. loaded into RAM, occupying 4.2K. An LINE INPUT -Reads an entire line of data, ignor- ing delimiters. overlay scheme is used so that only the LOAD -Loads a BASIC program from disk into needed portions of TRSDOS use RAM memory space at any given time. When Disk LOF -Returns highest physical record number used in a file. BASIC is called in, an additional 5.8K LSET/RSET -Places data into a random file buffer RAM is used. Additionally, about 280 in preparation for a write to disk. MERGE -Combines a BASIC program with bytes are required for each file the user Radio Shack Disk BASK: another program currently in memory. requests, up to 15,hence the minimum NAME (BASIC R only)-Renumber the lines in a requirement for use of a Mini-Disk TRSDOS will load and enter Disk BASIC BASIC program. RAM OPEN -Opens a file for use. This command system of 16K. whenever the command BASIC is en- specifies sequentiWrandom input or output, the tered. Typing CMD "S" under BASIC file number and file name. Radio Shack intends to continually up- PRINT#filenumber -Write to a sequential file. grade TRSDOS, adding new features will return control to TRSDOS. PUT -Writes data from a buffer to a specified record number in a random file. with each new version, so check with BASIC 2. Type BASIC 2 and the TRS-80 SAVE-Saves a BASIC program onto disk. (You your local Radio Shack store for informa- will be in Level I1 BASIC with full RAM can CLOAD a tape program, then easily put it on disk.) tion of the latest available version. For available. Disk BASIC enhances Level I1 reference, here are some of the features with the addition of several new of TRSDOS 2.2. The following functions are available to convert commands. numbers to text and back again. This way a 5-digit integer may be stored as 2 bytes rather than 5 utilities: BASIC *. Allows reloading and reentry ASCII characters, saving dmk space. into Disk BASIC from TRSDOS and re- APPEND -Adds one file to the end of another stores a program that was in resident (primarily data files). Convert to Convert to ATTRIB -Assigns or changes protective file when you exited BASIC. Type text numenc Bytes passwords with 5levels of protection to prevent mteqer MKIS CVI 2 unauthorized file access. BASICR. Enhanced Disk BASIC with singe precis~on MKS$ CVS 4 AUTO -Automatically executes a command on double precision MKDS CVD 8 power-up line renumber (NAME). BACKUP -Copies all of a diskette to another diskette (works even on a one dnve system by BASICR*. Reloads and enters BASICR swapping disks back and forth) Manual and Disks May Be CLOCK -Provldes constant time display in the from TRSDOSm and restores a program upper right corner of the v~deoscreen. that was in resident when you exited Purchased Separately COPY -Copies a file. BASICR. DATE -Sets the date which can be accessed by TIME$ in Disk BASIC. DEBUG -Machme language debugger, allowing Disk BASIC and BASICR allows either you to set break points, execute single-step in- random or sequential disk files. Pro- structions, dynamically watch registers during execution and display memory in hexldecimal grams may be stored in BASIC as ASCII or ASCII. or compressed format files. All files are DIR -Displays a directory of all files on a specified disk drive. If requested, will include logical record named. A Filespec name may consist of length, end of file and space used. an 8-character name, a 3character ex- DUMP -Stores a machine language program from memory to disk. tension, an &character password and a FORMAT -Format and verify a blank diskette. specific disk drive number. (All except Unusable sectors are marked. the file name are optional.) FREE -Dis~lavsfree sDace remainina on diskettes in all dhves. GETDISK -Copies any disk file or machine lan- Extension Commands: guage program onto cassette GETTAPE -Reads cassette data and wrltes it into CMD "D-Calls up DEBUG (see DOS). a disk file. CMD "I" -Exit to TRSDOS and issue a command. KILL -Deletes a file, makmg space avalable for CMD "R" -Restarts the 25 msec heartbeat reuse. (should he on for disk operat~ons). LIB -Displays all TRSDOS system commands CMD "T" -Turns off25 msec heartbeat. Thismust LIST -Lists a file to the video display he done before cassette YO is done. LOAD -Loads a machine language program from DEF FN -Allows user-defined functions. disk to memory DEFUSR -Defines an entry point for one of 10 user PRINT -Lists a file to the line prmter. machine language routines. PROT -Changes protection status of all non- HEX CONSTANTS -You can type-in hexadecimal system files on a diskette. and octal constants by preceding them with "&H 1. RENAME -Changes the name of a file. 01 "&." TAPEDISK -Loads svstem taDes into RAM, then INSTR -Tells vou the ~ositionof one string within to a specified disk file. another. TEST1 -Program to test the TRS-80's memory, MIDS -Allows MID$ on the left side of an equa read only and random access. tion. TEST2 -A BASIC program stress test for the en TIMES -Returns date and time as a text string. tire disk system. Time and date are set by the TIME and DATE TIME -Sets the time of day for the CLOCK display commands under TRSDOS. and TIME$ BASIC command. USRn -Calls one of 10 possible machine language TRACE -Prints the program counter on the routines. You can both send and return an argu- video display ment. Most items are available on Special Order for fast delivery Ask about delivery times. TRS-80 Library of Ready-to-RunSoftware Business- , Related (Business Software continued) (EducationalSoftware continued) Advanced Statistical Analysis. Advanced Disk BASIC Instru&on. A self-paced course Software versions of 26-1703 programs plus frequency in Disk BASIC covering DOS commands, ran- distribution. Multiple linear regression, time dom and sequential files, aU disk additions ta series analysis. Level II BASIC. 26-1705. (16K, L 11) ...... 39.95 26-2007. (16K Dxsk) ...... 29.Q5 Concrete Take-Off. Foundation and struc- Teacher Aide. Classroom management sys- Tape Mailing List. 80 names per data file tural cost estimating for contractors. Calcu- tem designed to assist teachers with student with 16K. 32K cassette system will hold 250 lates material requirements, labor compo- personal information, grade processing and names. 26-1503. (16K Level I1 required) . 19.95 nent, productivity and waste. averaging. Up to 35 students. Disk Mailing List. Selective printing from 26-1557.(32 Disk) ...... 199.95 26-1713. (16K, L IJJ ...... 29.96 one of seven key fields. Approx. 600 names Word Processor Disk. Enter and edit text on TRS-80Hands-on BCL (Basic Computer per data diskette, or 200 names on system video screen, save text on disk, output for- eracy] Padrage. Includes: Student Guide, diskette. 26-1551. (16K Disk) ...... 39.95 matted copy to printer. Buffered input for Teacher Guide, Algebra I, Program World, Business Mailing List. Fast sort in Zip Code high speed typing without dropouts. Stop Level Il BASIC Course Part I. 1, or any other sequence. 32K "Business Sys- tabs, horizontal and vertical centering, for- 26-1708. (a,L II) ...... 10O.m 1 tem"-990 names. 4 disk (48K) -2970 matted headers and footers, automatic page names. 26-1558.(32K disk) ...... 99.95 numbering, block manipulation and more. Games General Ledger I. 240 entries per session 26-1563.(32K Disk) ...... 99.95 and 1830per month with up to 100 accounts. Word Processor Cassette. Same as above BEaclrigGk Backgariunob. Fast paced fun! 26-1552.(32K Disk) ...... 99.95 with text storage on tape. 26.1802 ($K Level I) ...... 4.95 Inventory Control I. Retail inventory record 26-1505.(16K, L 11) ...... 69.95 26-1803,f4H Level II) ...... 4.95 keeping and control-up to 1000 items. "QuiQk Watson" Deduction Game. Tracks vendors, backorders, order dates, out FORTRAN and Assembly 26-1802. (4K L I or II) ...... 4.95 of stock and on-order items. Language Software Games Pack 1. Checkers, Hammurabi, Draw, 26-1553. (32K Disk) ...... 99.95 Star Pilot, Random Tic-Tac-Toe, Space Taxi. Manufacturing Inventory Control. Raw TRS-80FORTRAN. Compiler, editor, linking 26-1805, (4K, L I) ...... 19.95 1 materials inventory for 1900items. Up to 20 loader, library. 26-2201. (32K Disk) .....99.95 Casino Games. Pacb. Craps, Keno, Slot I ' finished goods per diskette. Prints bill of Disk Editor Assembler. Macro-assembler, Machine, Roulette, Wheel of Fortune and linking loader, editor, cross reference. Baccarat. 26-1806, (16K, L II) ...... 19.95 materials, material requirements and more. ' 26-1559.(32K Disk) ...... 199.95 26-2202. (32K Disk) ...... 99.95 Micro Chess. 3levels of difficulty For begin- Editor Assembler. Standard Zilog ningor advanced players. Accounts Payable. 75vendors 1000 ' transactions, or 200 vendors 800 Mnemonics for assembly language combined 26-1901. (4K,L I or II) ...... 19.95 transactions per month. Prints checks, regis- with the convenience of a text editor. For ad- Micro Movie. Draw and play back animated ter cash flow analysis and summary of activ- vanced programmers. Cassette only. "movies" on TRS-80 video monitor. ity for posting General Ledger. 26-2002. (16K, L I or 11) ...... 29.95 26-1903, (lIK, L I or 11) ...... 9.95 26-1554.(32K Disk) ...... 149.95 T-Bug. Machine language monitor. For ad- Micro Marquee. Create l-inchhigh letters Accounts Receivable. 300 customers 1000 vanced programmers. moving up your TRS-80 screen. 13characters transactions per month or 100 customers 26-2001. (4K,L I or 11) ...... 14.95 per line. 26-1904. (4K, L I or In ...... 4.95 2000 transactions per month. Prints aged re- Micro Music. Five octave range with sharps ports, monthly statements, and summary Programming Aids and flats, whole, half, quarter and eighth For posting general ledger. Renumber. Renumber all or art of BASIC notes. 26-lB02. (4K, L I or II) ...... 9.95 26-1555.(32K Disk) ...... 149.95 programs. 26-2004. (4K, L 11)~...... 9.95 Flying Saucer. Shoot 'em down in "real time" Fixed Asset Accounting. Control over fixed Double Precision Subroutines. Obtain 15 with your laser cannon. asset depreciation. digit accuracy with sine, cosine, arctangent, 26-1905. (4K, L Ior II) ...... 9.95 26-1560.(32KDisk) ...... 79.95 natural logarithm, exponential and square Invasion Force. Command a space ship via Time Accounting Package. Attorneys, CPAs root functions. 26-1704. (4K, L 11) ...... 9.95 TRS-80 keyboard. Destroy the aliens before and Job Contractors. 750 clients 1250 thev destrov vou! charges per month. Up to 26 user-defined Personal 26-1906. (16%:~I or l~)...... 24.95 charge codes, up to 5 partners with different Checkers 80. Competition "farced jump" In-Memory Information. Computerized card game with two levels of skill. rates. 26-1561. (32K Disk) ...... 199.95 filing system. 26-1502.(4K, L I or II) ....19.95 Disk Payroll. 100 employees and 14 user- 26-1907. (16K, L I or IIJ ...... 9.95 Personal Finance. Balance checkbook, &'E1izanArtificialIntelligence. Discuss your defined earnings and deductions categories. maintain monthly budget. Prints payroll checks and W-2 forms for any problems with "Eliza." 26-1602. (4K, L I) ...... 14.95 26-1908. (16K, L I or 11) .I496 state. 26-1556.(32K Disk) ...... 199.95 Budget Management. Up to 60budgeted ac- ...... Level I Cassette Payroll. Calculates counts with 25 cash expenses. 20 savings paychecks, including tax and other de- Communications transactions. 50 checks per month. Prints I ductions. Stores year-to-date and quarter- various reports. 26-1603. (16K, L 11) ....19.95 RS-232C Communications Software. 3pro- . to-date info for 11 employees. Cassette Portfolio Analysis. 3 programs: grams: "COMPAC" transmits a program or 26-1501.(4K, L I) ...... 19.95 "Buy and Sell" for stocks, funds and bonds. data. "HOSTwallows TRS-80 control from a Level I1 Cassette Payroll. 16K cassette holds "Summary" computes long and short term remote terminal. "TERM" makes TRS-80 a 15employees, 32K holds 75 and 32K Disk capital gains. "Options" tracks up to 10 dumb terminal. 26-1146. [16K, L II) ....29.95 holds 40. Prints checks and register. Sup- positions, computes returns and unrealized ports fixed-percentage state and city tax. gains. 26-1506.(16K, L 11) ...... 29.95 26-1504.(16K L II or 32K Disk) ...... 49.95 Standard & Poor's Portfolio Management Real Estate Vol. I. Stepped income analysis, and Security Selection System. A complete Important Notice compound interest, internal rate of return, stock analysis and portfolio management resale price. 26-1571.(16K,L 11) ...... 29.95 package. 26-1507. (32K Disk) ...... Ir 49.95 All Radio Shack Computer Programs Real Estate Vol. 11. Mortgage analysis. Are Distributed on an "As Is" Basis 26-1572.(16K, L 11) ...... 29.95 Educational Wi%hout Warranty Real Estate Vol. 111. Detailed property in- Math I. Teaches fundamentals of arithmetic. come calculations, appreciatioddepreciation 26-1701. (4K, L I) ...... 19.95 estimates. 26-1573.(16 K, L II) ...... 29.95 Algebra I. 6 self-paced lessons on 3 tapes. Real Estate Vol. IV. Ellwood analysis, overall 26-1702. (4K, L I) ...... 19.95 capitalization rate, graphic analysis, sensitiv- 1.0. Builder. 8 tapes with 38 programs on ity analysis. 26-1574.(16K, L 11) ...... 29.95 vocabulary, antonyms, synonyms, analogies, consesueatial damaaes resultma from the use or orrerM&lid Real Estate Vol. V. Programs for cash flow number series. 26-1706. (4K, L I or 11) . . 29.95 of such computer or compute^ Gograms and depreciation. Level I BASIC Course. Self-paced course 26-1575.(16K L 11) ...... * 29.95 teaches Level I BASIC for TRS-80.4tapes. data and run iheiystem m parallel wth ihe sgstenj Real Estate Vol. VI. Building development, 26-2003. (4K, L I) ...... 12.95 premously m use for a penod of Me adequate to msure that results of operation of the computer ar Monte Carlo time trend, decision tree Level I1 BASIC Course Part I. 4 cassettes in- program are eatlsfadow. analysis. 26-1576.(16K L II)...... * 29.95 troducing TRS-80 Level I1 BASIC. .%I Statistical Analysis. Random sample, his- 26-2005. (4K, L 11) ...... 14.95 togram, descriptive statistics. T-test, simple Level I1 BASIC Course Part 11. Interactive correlation, linear regression. self-paced course on advanced Level I1 26-1703.(4K L I) ...... 29.95 BASIC. 4 tapes. 26-2006. (16K, L 11) ....19.95 * Avadahle December, 1979 14 '1 Our Most Popular TRS-80Systems

"Engineer" For more technical applications, the "En- 16K System gineer" system combines powerful Level I1 with 16K of RAM. The new Printer Interface cable allows direct connection of the Quick 16K Level I1 Complete Printer to TRS-80's bus connection, without System (26-1056) using the Expansion Interface. Quick Print- Printer Interface er provides 80-column hard copy .and pro- Cable (26-1411) gram listings. The Space-Saver holds the Quick Printer (26-1153) entire system and provides the user with Space-Saver Desk ample work space. F (26-1304) ,

"Professional" 16K System

Mini-&sk for expanded language, fast data 16K Level 11 Complete handling and approximately 49,900 bytes of System (26-1056) user disk storage space. Quick Printer pro- Expansion Interface vides 80-column hard copy and program (26-1140) listings. System Desk holds the entlre sys- Mini-Disk System tem with plenty of work space left over. (26-1160) Quick Printer, Cable (26-1153, 26-1401) System Desk (26-1301)

"Business" 32K System Two mini-disk units gve user approximately 135,600bytes of disk storage. 32940° Vxtually all TRS-80 disk-based business 16K Level I1 Complete System (26-1056) software requires this as a minimum system. Applications include general ledger, Expansion Interface, 16K RAM (26-1141) payroll, disk mail list and more. Line Printer I1 adds real versatility and convenience to 4 2 Mini-Disk Systems (26-1160,26-1161) this system, without taking up a lot of work space. Line Printer I1 and Cable (26-1154, 26-1415) 1

"Deluxe Business" 32K System Approximately 135,600 bytes of disk stor- 16K Level 11 Complete age space from the two mini-disk systems. System (26-1056) Tractor feed line printer uses fanfold paper Expansion Interface, with feed holes in the margins and will pro- 16K RAM (26-1141) duee up to 5 carbon copies. The System * 2 Mh-Disk Systems Desk has recessed spaces for the Expan- (26-1160, 26-1161) sion Interface and keyboard with intercon- Tractor Feed Line necting wiring concealed. Line printer Printer, Cable stand leaves more desk space. (26-1152, 26-1401) System Desk (26-1301) Line Printer Stand (26-1302) TRS-80~ine Quick Printer I1 Line Printer I1 A "mini" line printer priced to fit Prints 50 characters per second on &inch Printer I everyone's budget. And best of all, it can lines of 80 characters each. Also prints TRS-80 Line Printer I is a medium-speed connect directly to your TRS-80 -it expanded (wide) letters under software 5x7 dot matrix impact printer suitable for needs no Expansion Interface. Software control. Features upper and lower case business, education and home use. It selectable for 16 to 32 character lines. letters in a 7x7 dot matrix format and uses the standard 64-character upper Prints upper and lower case and features wdl operate in both friction-feed and case ASCII character set, but does not automatic "wrap-around" when text ex- pin-feed modes. Continuous forms 9% support TRS-80 graphics. ceeds helength, so there's no data lost inches wide (original and up to two to overflow. A built-in microprocessor copies) are kept in precise alignment by It uses only fanfold paper with feed controls the printer and communications nonadjustable pins built onto the platen. holes in the margins and will produce up with other units. With three interface Also prints single sheets. When used as to 5 carbon copies. A continuous-loop choices, this versatile printer can be a friction-feed unit, inexpensive roll cloth ribbon lasts approximately as long used on a variety of computers. Get paper fits in a detachable rear bail. as a standard typewriter ribbon. low-cost, hard copy output on a Z3/8"- 26-1154 ...... 970.00 The width of the letters, or "print den- wide roll of aluminum-coated paper. In- Mod I Cable. 26-1415 ...... 29.00 sity," is continuously variable from 10 to cludes cable to connect to CPU. Mod I1 Cable. 26-4402 ...... 29.00 16.5characters per inch. Print density af- 26-1155 ...... 219.00 Roll Paper. 26-1402 ...... 19.95 fects print speed. At maximum density, Cable for Expansion Interface. Ribbons. 3-pack. 26-1413 ...... 18.95 the printers wdl produce 132-character 26-1406 ...... 19.95 91/~x11"Fanfold Paper. 26-1403 ...37.95 lines at a speed of 21 lmes per minute. Paper. (2rolls) 26-1412 ...... 3.95 Line Printer I1 Specifications Quick Printer I1 Specifications Tractor-feed is required for multiple Prmt Density' 8-inch hnes of 80 characters each copies and exact placement of type on Print Density: 18 or 9 characters per inch, software Print Speed: 50 characters per second. D~mensions. selectable (32 or 16 cpl).Print Speed: 120hnes per 15~11x5'.10lbs Power 120VAC, 60 Hz 200 watts preprinted invoices, payroll checks, etc. mmute. Paper: Aluminum coated, 2%'' wide (avail- Tractor width is adjustable from 3 to 11.5 able through Radio Shack stores). Dimensions: inches. Top of forms control is available 3-5/16x6-314x9-1/4".power: IZOVAC, 60 Hz. U.L. through software. hsted. Requires Level 11 (or Disk BASIC), a con- necting cable and Expansion Interface. Attach Uuick Printer, Line All Level I1 PRINT commands except PRINT@ can be used (preceded by an - Printer I or Line Printer I1 to "C').Includes manual. Your Level I1 TRS-80Bus 26-1152 ...... 1559.00 Mod I Printer Cable. 26-1401 ...... 39.00 without Expansion Interface Mod I1 Printer Cable. 26-4401 .....39.00 Ribbon. 3 pack. 26-1413 ...... 18.95 Paper. Fanfold 9Yzx11". 26-1403 ...37.95 Mail Labels. 26-1404 ...... 19.95 Printer Interface Came. Lets you add a complete hard copy system without usmg TRS-80 Line Printer Specifications the Expansion Interface. Connects &ectly from the TRS-80 bus connector to the Print Density: 10-16.5characters perinch (up to 132 Quick Printer or Line Printer I. characters per line). Print Width: Up to 8". Print 26-1411 ...... 59.00 Speed: 60-100 characters per second. Vertical Line Spacing: 6 lines per inch. Dimensions: 9.5 x 19.8 x Line Printer I1 Interface Cable. Interfaces with Line Printer I1 without using the 19.5". Weight: 45 lbs. Power: lZOVAC, 5W60 Hz, 3 Expansion Interface. Connects directly to TRS-80 bus connector. Amps. 360 Watts. U.L. listed. 26-1416 ...... Quick Printer TRS-80Line Delivers 150 lines per minute on 4.75- inch wide alurninum-finish paper. No Printer I11 nbbon is needed. The paper is unaf- For applications requiring higher speed fected by light, heat or humidity. Prints and full 13-inch wide, 132-character lines, all keyboard characters (except arrows), Radio Shack's new Line Printer 111 is the and upper and lower case letters. answer! This quiet, professional printer Graphics are not supported. Variable includes many outstanding features. .. character width (20,40or 80 characters even "self-test!" per line), automatic underlining and an 9x7 dot matrix upper and lower case let- audible signal are all fully software con- ters, as well as numbers, are printed at a trollable. All Level-I1 line printer com- fast 120 characters per second. For even mands are used. Features paper-empty faster "throughput," the head prints in light, print select (on/ofD,paper advance both directions as it moves across the and power onloff switch with pilot light. paper. Accurate positioning of pre- r Requires either Expansion Interface, I1 printed forms such as invoices or checks Printer Cable and Level BASIC or is easy, with controls for line-feed in in- Printer Interface Cable and Level I1 crements as small as 1/8th-line. Ex- BASIC. panded (wide) characters may be ; 26-1153 ...... 499.00 software selected for headings or em- Mod I Printer Cable. 26-1401 ...... 39.00 phasis in your printed reports. :- Mod I1 Printer Cable. 26-4401 .... .39.00 Paper. (3 rolls) 26-1405...... 16.95 The fully adjustable tractor mechanism feeds continuous forms of varying width Quick Printer Specifications Pn-ntDensity: 20,lO or 5 characters per mch, up to a maximum of 15 inches, while as- software selectable (80, 40 or 20 cpl). Print Speed: suring accurate alignment. Drive motors 150 llnes per minute. Paper: Aluminum coated roll, run only during actual printing, so Radio 4.75 wide by 131' long. (Available through Radlo Shack's Line Printer 111 can always be si- Shack stores) Dirnensfons: 41/4x13x10'/z". 10 Ibs. Power: IZOVAC, 60 Hz. 40 Watts. U.L.listed. lently awaiting your print command, on Stands either TRS-80 Model I or Model 11. Printer Line Printer Stand. Line Printer I and For the finest in fast, versatile printers, a number of others attach directly to the speclfy Radio Shack's all new, exclusive stand's crossmembers through existing Line Printer III. holes in their rubber feet. The "modesty Note: All TRS-80 printers 26-1156 ...... 1960.00 panel" turns sideways to accommodate used with a Model I require Mod I Printer Cable. 26-1401 ...... 39.00 many popular 15"-wideprinters. (Not Level I1 BASIC or Disk Mod I1 Printer Cable. 26-4401 .... .39.00 Line Printer III) . BASIC. Ribbon Cartridge. 26-1414 ...... 21.95 26-1302 ...... 99.00 14%xll"Fanfold Paper. 26-1417 .. .49.95 The Level I TRS-80 cannot Mail Labels. 26-1404 ...... 19.95 EC Line Printer I11 Stand. Puts the be used with a printer. printer right at your fingertips and frees Line Printer 111 Specifications deskspace. Includes basket. Print Density: 10 or 5 characters per inch, software 26-4302 ...... 139.00 selectable. Print Speed: 120 characters per second. Dimensions: 7-2/5x24-35x15-9/10': 42 pounds. Power: IZOVAC, 47 to 63 Hz, 85 W. Model I1-An Exciting New Member of the TRS-80Family! Easy to Operate Fast and Expandable 32K or 64K of RAM Upper and Lower Case Direct Memory Access Built-in 8"Diskette

32K,1-Disk TRS-80 Model I1 System

64K,1-Disk TRS-80 Model I1 System

Anyone accustomed to a typewriter Model 11-operates at a speed of 4 MHz will feel right at home at the Model I1 -over twice the speed of TRS-80 Model growing-needs. Three expansion con- keyboard. We kept it sunple, with as few I. Separate keyboard and vldeo pro- nectors (one parallel and two serial) "special" keys as necessary to do the lob. cessors also add to Model II's speed. allow you to connect printers, plotters, A calculator-style keypad IS provlded for digitizers, telephone communications faster, more accurate numenc entry User-Oriented and many other external devices. Inter- Model II's easy-to-read 12-inch,high- nal plug-in card slots allow for more ex- Each time you turn on Model 11, it au- pansion and enhancement options in the resolution video screen displays 24 lines tomatically "self-tests" to assure proper of 80 upper and lower case characters future. . .several are in the planning operation. Features in Model II's pro- stages now. per line. (Double-width characters -40 gramrmng language allow an operator to per line-can also be selected by your turn the system on, and be ready to run If your application requires more disk program). payroll, posting, billing or other lobs im- storage, you can plug in a Model 11 Disk Inside Model I1 mediately, without any action other than Expansion Unit with one, two or three entenng the current date. Model II is additional drives If you select an Expan- Internal memory (depending on the sys- "forgving" of operator errors, too. If you sion Unit with one or two drives, you can tem you choose) will store 32,000 or try to load a program when there's no add the others later. Of course, a 32K 64,000 characters of mformation. The re- disk in the drive, Model I1 won't hang up system (32,000characters of memory qulred "Operatmg System" software oc- hke many other computers. And, when storage) can be expanded to the full 64K cupies about 27,000 characters, with the you give Model 11 a command such as to at any tune balance available for user programs and "kill" a file, it always responds with posl- Model 11 comes with a d~skcontainmg data. The built-m 8-inch disk drive will tive feedback. ..telling you exactly what our expanded Level 111 BASIC program- store an additional 416,000 characters. it did (or did not do) in response to your ming language and our all-new, (That's equal to about 20 straight hours command. When an Operating System command-compatible "TRSDOS" operat- of typing at 70 words per minute!) The error occurs, a message appears on the mg system. This "system software" wdl three additional disk drives you can add, video screen with a numbered error be upgraded periodically with new fea- each store another 486,000 characters, code. And no flip charts or manual are tures, and we plan to offer additional bringing Model II's total memory capac- requlred if you don't remember the error programming languages for Model II m ity to about 2 mdlion characters. codes. Just type "Error 32" (or whatever the future Applications software for Experienced data processing people will the number) and Model II will respond General Ledger, Ipventory Control, Re- recognize the terms "direct memory ac- with a detailed explanation. cewables, Payroll and Malllng List IS cess" and "vectored interrupts," which avadable now, and more wdl be avallable to the average business user translate as Model I1 is Expandable soon. 32K, 1-Disk Model 11.26-4001 ...... 3450.00 faster operation and more versatility The Llke TRS-80 Model I, Model 11 systems 64K, 1-Disk Model 11.26-4002 ...... 3899.00 fast Z-80A microprocessor-the heart of are expandable to meet changing-or 32K Memory Add-on ...... 449.00 19 Level I11 BASIC and TRSDOS Disk Operating System

INP and OUT, which are no longer needed. OCT$-Converts a decimal number to an Machine language subroutines are entered octal string. easily using Model II's improved "DEBUG" PAUSE-Interrupts a "DO" file to require an utility, and previously "POKED" values such operator action, such as inserting a diskette as top of forms are handled by their own when instructed. unique commands. PURGE-Automatic "KILL" mode Lists all While BASIC programmers familiar with non-system files on a disk and asks if they Model I will feel right at home, machine lan- are to be killed. guage piogrammers will find a totally new RENUM-Renumbers program lines. and different architecture "under Model II's hood." We think you'll agree it's quite an im- RESET-Restores default system settings provement in all respects. for all devlces. SETCOM-Initiahzes commun~cationsdriv- In addition to the commands listed, Level I11 ers for the serlal ports. BASIC and Model I1 TRSDOS have the following additional commands, not part of the SPACE$-Prints a specified number of blank Model I system: spaces. SPC-Prints spaces on video display SWAP-Exchanges the values of two named AGAIN-Causes the last command exe- variables. cuted to repeat. WIDTH-Sets line wldth for video display TRS-80 Model I1 computers contain a very BUILD-Allows building a file for automatic ADDITIONAL OPERATORS: MOD, IMP, EQV, small amount of Read-Only-Memory (ROM), command entry in place of keyboard entry, XOR (Integer Division). which performs power-on diagnostics, then executed with the "DO" command. automatically loads the Operating System CREATE-Creates a named file and allo- from disk. The ROM is electrically replaced Model II's new TRSDOS responds to your cates disk storage space for it. Having pre- commands with positive feedback. If you by RAM, for a total of 32 or 64K, depending allocated space allows faster file handling in on the Model-I1system you have. say "KILL 'file-name' '', TRSDOS will BASIC. (Space can be dynamically located.) respond with " 'filename' KILLED",or Model II's 8-inch diskettes contain 76 acces- DO-Executes a file created with the " 'filename' NOT FOUND'', so you'll always sible tracks of 25 sectors each -a sector "BUILD" command. By using "AUTO DO," a know what was or was not accomplished by BASIC program may be executed on power- contains 256 bytes. A "gran" is 5 sectors. The your command. And backup (duplicatmg) of sysiem diskette (which must always be up, without operator entry. a diskette requues knowledge of a master present in Model II's built-in disk drive) has ERASE-Cancels a dimensioned array and password, which gives you additional pro- 65 tracks, or about 416,000 bytes of storage frees its memory space. gram and data security. available for your data and programs. On ERROR-Returns an explanation of a non-system diskettes, 75 tracks about These examples are taken from version 1.1 of - specified error number. 486,000 bytes -are available to the user. our Model I1 system software. Of course, FORMS-Formats the line printer-top of Radio Shack will continue to enhance the Disk rotation speed is approximately 360 forms, length and width of forms, and can Level IIVTRSDOS Operating System for RPM and data is transferred from disk at send one character to the printer for testing Model I1 with new releases. Additional lan- about 62,500 bytes per second, 5 times the forms positlonmg. guages will also be made available and will speed of TRS-80 Model I's Mini-Disk system. be announced as they are released. Our HEX$-Converts a decimal number to a abhty to expand Model II's language hexadecimal string. Model II's "Level 111 BASIC" -an expanded capabilities is enhanced because the system version of Level I1 -and a new, command- NULL-Sends blanks at the end of a line is RAM-based, and has no primary language compatible TRSDOP Disk Operating Sys- (communications). in ROM. tem occupy some 70,000 bytes on the system diskette. An overlay scheme allows it to require only about 27K of RAM, leaving 5K free in a 32K Model I1 or 37K in a 64K system. Command compatibility has been main- tained to the greatest possible extent for the convenience of Model I owners who decide to move up to the additional speed and capability of TRS-80 Model 11. The system uses numbered error messages which ap- pear on the video screen in a reversed field. For convenience, you can type the number of the message and receive a definition of that message on the screen.

The commands listed to the right are com- mon to both the TRS-80 Model I and Model I1 languages. Operating System commands are in bolder type.

A few of these commands have a slightly different use in Model 11. For example, "SYSTEM" is used to enter DOS and (option- ally) execute a DOS command with return to BASIC. A number of the commands also include more options in the Model 11 language. You will note the absence of PEEK, POKE,

TRS-80Model I1 "Starter System"

Basic, Powerful TRS-80 Model I1 System with Line Printer - Expandable as Your Needs Increase

An exceptionally affordable system with 486K bytes of disk storage (including operating system software), 64K internal memory (26-4002), a small pin-feed 9%-inch wide 80-column printer (26-1154)and a Line Printer 11 cable (26-4402).Ideal for many businesses as it stands, yet instantly ready to be expanded as your business grows.

Approximately 416,000 Free Bytes of Disk Storage

Model I1 "Step-up System"

64K System with Medium-Speed Line Printer, Line Printer Stand and Our System Desk This expanded system is the perfect answer to inventory control or payroll for small businesses. Built around the TRS-80 64K Model I1 (26-4002),the system includes the Tractor Feed Line Printer (26-1152),capable of produc- ing 132-characterlines at a speed of 21 lines per minute. Also features the Printer Cable (26-4401),Printer Stand (26-1302) and our System Desk (26-4301)that holds the entire system and still provides ample work space. Expand the memory capacity of this system by adding an optional external disk system when you need it.

Approximately 416,000 Free Bytes of Disk Storage Business System" 799800 A Very Powerful, High-Capacity System with High-speed, Wide Carriage Line Printer Compare thls versatile and powerful system with 1.5 donbytes of disk storage and 64K mternal memory (26-4002),with systems cost- ing twice as much. Includes a 2-drive external disk system (26-4161),our 15-inch 120 CPS Tractor-Feed Line Printer III (26-1156),and Model 11 System Desk (26-4301).Ideal for larger, integrated accounting systems.

Approximately 1,388,000Free Bytes of Disk Storage

Model I1 "Deluxe 2 Megabyte Business System" 873700 Our most Powerful, "Full Bore" Model I1 System. 64K,3-Disks, High-speed Printer with Stand

This expanded busmess system features approximately 2,000,000bytes of user &sk storage! 64K internal memory (26-4002) and a 3-dnve external dlsk system (26-4162)combme to give you maximum TRS-80 storage. Includes desk for Model 11 (26-4301),Line Printer 111 (26-1156) and Line Printer 111 Stand (26-4302).

Approximately 1,874,000Free Bytes of Disk Storage Radio Shack has what it takes to be your small-computer company

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Availability!TRS-80 Model I is in Expand-ability!Modular design stock at most Radio Shack stores. You means even the smallest TRS-80 can see and try it before you buy. Model I system can be expanded to Model II is on display in all 50 Radio our largest Model I business system Shack Computer Centers and 100 by using our plug-in accessories. The special computer departments in TRS-80 Model I1 business computer major cities. You can order Model 11 at expands just as easily any of our over 7000 locations. Easy operation! Our widely After the sale! Your TRS-80 is in good acclaimed Level I users manual hands with our expert technicians. makes it easy, even fun, for a novice to Over 100 company-operated repair learn computer programming. centers nationwide service only our own computers, so we know them Software!Prerecorded programs are "inside out." And all 50 Radio Shack available, now, to put your TRS-80 Computer Centers nationwide offer Model I or Model 11 to work -im- classes for everyone from beginners mediately. And we are constantly to advanced programmers. Yes, we're expanding our line of programs. in computers to stay!

The biggest name in little computersm

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