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Zenith Data Systems ZENITH DATA SYSTEMS All Rights Reserved Printed in the United States of America SAINT JOSEPH, MICHIGAN 49085

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Zenith Data Systems ZENITH DATA SYSTEMS All Rights Reserved Printed in the United States of America SAINT JOSEPH, MICHIGAN 49085 Copyright ©1981 Zenith Data Systems ZENITH DATA SYSTEMS All Rights Reserved Printed in the United States of America SAINT JOSEPH, MICHIGAN 49085 Page 1-2 TABLE OF CONTENTS INTRODUCTION..............................................1-3 REPLACEMENT PARTS LIST ......................9-1 Power Supply ...................................................9-1 SPECIFICATIONS ..........................................2-1 Video Circuit Board ..........................................9-1 Video Driver Circuit Board ..............................9-3 SETUP AND TESTING ...................................3-1 Terminal Logic Circuit Board ..........................9-3 Power Line Considerations .............................3-1 CPU Logic Circuit Board ..................................9-4 Cabinet Removal ...............................................3-2 Chassis Parts......................................................9-5 Testing ..............................................................3-3 Serial Interface Circuit Board ..........................9-6 SYSTEM CONFIGURATION .........................4-1 SEMICONDUCTOR IDENTIFICATION .... 10-1 ZDS System Configuration ..............................4-1 Component Number Index ........................... 10-1 Terminal Logic Circuit Board .........................4-1 Part Number Index ..........................................10-4 CPU Logic Circuit Board ..............................4-4 Serial Interface ...........................................4-7 APPENDIX ..................................................... 11-1 Memory Map ................................................4-8 ASCII Characters ............................................ 11-1 I/O Port Useage .............................................4-8 Graphic Symbols.............................................11-5 Transmitted Codes .........................................11-7 ZDS Escape Sequences ............................... 11-10 OPERATION ....................................................5-1 ZDS Escape Sequences Defined ...................11-12 Command Summary .......................................5-1 ANSI Escape Sequences ...............................11-17 Keyboard Operation ..........................................5-2 ANSI Mode Summary ..................................11-19 Normal Modes and Keys...............................5-4 ANSI Escape Sequences Defined .................11-20 Special Modes and Keys...............................5-7 The Functions of a Computer .....................11-27 Use as a Terminal .....................................5-16 Instruction Set ...............................................11-31 Demonstration Programs ..............................11-50 READJUSTMENT .......................................................6-1 s TROUBLESHOOTING ........................................... 7-1 Z80 CPU .........................................................12-1 Troubleshooting Charts ...................................7-2 INS8250 ASYNCHRONOUS SERVICE INFORMATION..............................7-5 COMMUNICATIONS ELEMENT ............13-1 INDEX ............................................................. 14-1 CIRCUIT DESCRIPTION ......................................8-1 CIRCUIT BOARD X-RAY Power Supply Circuit Board ...........................8-2 VIEWS ...........(Illustration Booklet, Page 10) Video Circuit Board........................................ 8-3 Video Driver Circuit Board ..............................8-6 Terminal Logic Circuit Board ..........................8-6 SCHEMATIC .............................................Fold-in CPU Logic Circuit Board ................................8-15 Page 1-3 INTRODUCTION This Zenith Data Systems Digital Computer is a ver- Lower-case characters that have descenders use a 5 satile, 8-bit microcomputer and a professional x 9 dot matrix. The Computer can also display 33 video terminal, both built into the same cabinet. special graphic characters that can be arranged and The computing functions and terminal operations grouped to form any number of graphic displays are both controlled by separate Z-80 and effects. The graphic symbols are formed on an microprocessors. The high quality keyboard, video 8 x 10 dot matrix. display, state-of-the art logic circuitry, and plug-in accessories make this Computer outstanding. Note that, because this Operation Manual was designed to Special keyboard and software-controllable escape be used with more than one Computer system, your sequences allow you to select and use many special Computer may vary slightly in some respects with functions. These include: the descriptive material that is presented. • Using either ZDS or ANSI escape sequences. Some features of the Computer are: • Eight user-defined special function keys. • Alternate keypad output (for sending more • Up to 64k bytes of user-addressable memory. user-defined special codes to your computer). • Wired and tested CPU and terminal logic • Shifted keypad (so you can obtain the circuit boards. shifted keypad functions without using SHIFT key). • An internal monitor that automatically sizes the • Keyboard enable/disable. memory and initializes the unit at power- • Key-click enable/disable. up. The monitor resides in 2k or 4k bytes • Cursor-type select (underline or block). (depending on the exact configuration) of • Auto LF (line feed), auto CR (carriage re- ROM which contains load and dump routines turn). that eliminate the need for bootstrap and loader programs at turn-on. • Hold screen mode (for scrolling lines and pages). • A floppy disk drive unit and its interface • Cursor control (left, right, up, down, home). circuit board (optional, depending on the • Direct cursor addressing. configuration). • Access and use of 25th line. • A multiport serial interface circuit board. and you can also: The information is displayed on a 12" (diagonal), • Transmit page. high-quality cathode-ray tube (CRT) that can • Transmit 25th line. display 2000 characters at one time (25 rows of 80 • Insert and delete characters and lines. characters). The phosphor used in the CRT provides superb character definition. Upper-case • Enter and exit the graphics and reverse characters are formed by a 5 x 7 dot matrix. video modes. • Erase lines or page or text. • Modify baud rates. Page 1-4 The highly reliable, standard-size electronic the cursor. Plus, an alternate mode allows you to keyboard uses the universally accepted, standard interchange the shifted and unshifted functions typewriter format. Each key stroke is affirmed by an and send special codes to your Computer. audible click. These features, along with the stylish molded cabinet, A 12-key keypad duplicates the numeric key in a make this Zenith Data Systems Digital Computer a calculator format. This lets you rapidly enter numbers versatile and powerful computing center. in programs that call for just numbers. In addition, the shifted keypad functions allow you to insert and delete lines and characters, and move WARNING This equipment generates, uses, and can radiate radio frequency energy and if not installed and used in accordance with the instructions manual, may cause interference to radio communications. As temporarily permitted by regulation it has not been tested for compliance with the limits for Class A computing devices pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference. Operation, of this equipment in a residential area is likely to cause interference in which case the user, at his own expense, will be required to take whatever measures may be required to correct the interference. If this equipment does cause interference to radio or • Unplug and remove any serial I/O circuit television reception, which can be determined by board cards that are not being used. (Here turning the equipment off and on, the user is encour- again, unterminated cards can be a source aged to try to correct the interference by one or more potential interference). of the following measures: • Be certain that the computing devices are • Move the computing device away from the plugged into grounded outlet receptacles. receiver being interfered with. (Avoid using A/C cheater plugs. Lifting of the power cord ground may increase RF emission levels but also presents a lethal • Reorient the receiving antenna. shock hazard to the user). • Plug the computing device into a different AC If additional help is needed, consult the dealer or ask outlet so that the computing device and for assistance from the manufacturer. Customer ser- receiver are on different branch circuits. vice information may be found on the inside back cover of this manual or on an insert sheet supplied with this equipment. The user may also find the fol- • Disconnect and remove any I/O cables that are lowing booklet helpful: "How to Identify and Resolve not being used. (Unterminated I/O cables Radio-TV Interference Problems." This booklet is are a potential source of high RF emission available from the US Government Printing Office, levels). Washington, D.C. 20402 – Stock No. 004-000-00345-4. Page 2-1 SPECIFICATIONS CPU AND MEMORY Processor... ...................................................................... Z-80 Clock.............................................................................2.048 MHz. Memory ........................................................................48 k bytes user RAM (expandable to 64k), Z-89 series 64k bytes user. RAM, Z-90 series 8k System for ROM and RAM. 8k reserved. CRT...............................................................................12"
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