DOCSLIB.ORG

Computers&Electronics

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Computers&Electronics Computers&Electronics EPTEMBER 1983 formerly Popular Electronics $1 75 Improving Timex/Sinclair Data -Tape Loading Sony's New Personal Desktop Computer System Computerized Video Drawings Made Easy One -Shot Testing of Multiple Circuit Points 11-11,.# 1 1 1 .\\I. 1 r1 I A i f - .... f-7'I '1TTTT7 . II 1 ] _P .I- P _ 1 110S6 t!J OtJI1ndn7 210 OCOr131121nW 0519 0 N21060 é't 113N)121y0 1 o 1,873O OTbT T60W0S19 )1210 260i0^z view 140 14 7 1t ating System Simplified BUY A BANANA. SAVE A BUNCH. Meet the Banana',"the very business reports, etc.) tractor tough, versatile, portable, and feed (for precise alignment and reliable dot-matrix printer from quick loading), parallel or serial Gorilla:" interface (take your pick), self - At $249.95 retail it's an ideal inking ribbon cassette (for long and inexpensive companion for life and easy installation), 10 personal computers like Apple portable pounds in weight, and (or Apple"look alikes'such as compatibility with so many of the Franklin""orAlbern, most popular personal computers Commodore; "I'll S-80,` Kaypro;" on the market. Timex," Osborne;'etc. Plus its print head features a After that, it's merely com- unique single -hammer design that parable to other printers that can eliminates a lot of moving parts, to cost up to three times as much: eliminate a lot of annoying repairs. 10" carriages (to handle standard That's the Banana: silly name, 9'/2" paper), 80 columns, graphics serious service. It's everything capability, 10 characters per inch the expensive dot-matrix printers (expandable to 5 cpi) draft -quality are... print (for perfectly acceptable Except expensive. form letters, data processing, - , . -t>a( o..,:" Leading Edge Products Inc., 225 Turnpike Street, Canton, Massachusetts 02021 Toll -free: 1-800-343-6833; In Massachusetts(617) 828-8150. Telex 951-624. E NO. 20 .r INFORy/ ARD Here's why we're Number One. When it comes to logic probes, more people purchase Global Specialties! Because you can spend twice as much and not get the speed. precision, flexibility and accuracy offered by our four logically -priced probes-including our remarkable True multi -family new 150 MHz ECL Probe. Not to mention the versatility, performance: reliability and durability we've become famous for. DTL, TTL, CMOS. Or ECL'! But we don't stop there. When it comes to logic testing, Global Specialties does the complete job. With our DP -1 auto -sensing digital signal injector-for fast, easy stimulus -response testing at an economical $83.00*. Plus a line of multi -channel Logic Monitors that provide an inside picture of circuit activity at up to 40 nodes simultaneously. And each product has an idea - filled applications manual-as well as an unmatched line of highly -functional accessories, to extend its versatility still more. With Global Specialties, there's no need to compromise on performance. Or value. Discover for yourself why we're the number -one logical choice! Easy -to -use Memory and Pulse functions Full readout Interchangeable thin - indications-HI, LOW profile power cords PULSE (instead of awkward. heavy or coiled cords) Overload and AC -line - Unsurpassed reliability- high - protected performance proven impedance input Linear input impedance All eliminates errors due to specs conservative non -uniform loading and guaranteed Half the price for equal Complete line of (or better) performance interchangeable probe tips and - Circuit -powered with grounding wires. reverse -voltage including easy protection clip, banana plug. alligator clip jumpers and variety of power cords - - - f: 151 r. -i ;.el - : Trr 1 . smoes y- Standard LP -1, only $50.00', with latching memory-captures pulses as fast as 50 nsec, to 10MHz, guaranteed Economy LP-2, $32.00', guaranteed to 50 nsec, 1.5 MHz High-speed LP -3 with memory, only $77.00', guaranteed to 10 nsec (6 nsec, typical) and 50 MHz! New ECL LP -4', $150.30; the new industry standard-with memory, guaranteed to 4 nsec (2 nsec, typical) at 150 MHz! 'LP -4 probe exclisively for use with ECL. For DTL, TTL or CMOS, select LP -1, -2 or -3. Compact, high -impact, human -engineered case -free for 70 Fulton Terr. New Haven, CT 06509 (203) 624-3103. TWX 710-465-1227 GLOBAL Call toll details OTHER OFFICES San Francisco(415) 646-0611. TWO 910-372.7992 Europe Phone Saffron -Walden 0799-21682, TLX 817477 1-800- 6077 Canada: Len Finkler ltd.. Downsvrew. Ontano SPECIALTIES Duri ness43- CORPORATION Suggested U S resale Prices. specifications subject to change without notice ® Copyright 1981 Global Specialties Corporation. Circle No. 46 on Free Information Card Computers&Electronics SEPTEMBER 1983 VOLUME 21, NUMBER 9 FEATURE ARTICLES A NEW BREED OF COMPUTER PRODUCTS Am 32 Joe Desposito/A roundup of recent innovative computers and related products. UNIX THE EASY WAY 43 David Fiedler/Fundamentals of the Unix operating system. 1 1 II FAST AND EASY GRAPHICS WITH A I LOW-COST TOUCH TABLET ' 5 1 Joe Desposito/Enables computerists to bypass a computer keyboard, while creating drawings. THE MODULARIZED COMPUTER-SONY'S 59 NEW SMC-70 Stan Veit/A hands-on look at a unique small computer system. A COMPUTERIZED DIALING SYSTEM FOR THE TRS-80 MODEL II 64 James Barbarello/Enhance utility of TRS-80 in LES SOLOMON ON COMPUTER HARDWARE office -type applications. 26 Invisible Short Circuits In Digital Equipment. COMPUTER SOURCES LEARNING 16 -BIT MICROCOMPUTER TECHNOLOGY 27 72 George Meyerle/Part 7: How to use the monitor to create software. 85 ENTERTAINMENT ELECTRONICS Len Feldman/Digital TV-How Soon? A MULTIPLE TEST-POINT MONITOR 76 George Gooder/Measures volts at a number of circuit THE ELECTRONICS SCIENTIST points simultaneously. 90 Forrest M. Mims, III/Homemade Electroscopes and Experimenting with a Geiger Counter. BEEP! BEEP! 79 James Antonakos/Add a power-failure sensor to any ac DEPARTMENTS digital clock. IMPROVING TIMEX/SINCLAIR TAPE LOADING 80 Tim Stoner/Reduce troublesome dropouts and noise problems. EDITORIAL/Art Salsberg 6 Compuphobia. A VIC-20 CASSETTE ADAPTER 84 Bernard J. Sheehan/Interface for the VIC-20 allows any audio cassetter recorder to be used. 12 LETTERS COLUMNS 16 NEW PRODUCTS 103 COMPUTER MART/ELECTRONICS CLASSIFIED COMPUTER VIDEO GAMES 22 112 ADVERTISERS' INDEX COVER ART BY A. DANIELS monthly COPYRIGHT 0 1983 BY ZIFF-DAVIS PUBLISHING COMPANY. All rights reserved. Computers 8 Electronics (ISSN 0032.4485) September 1983, Volume 21, Number 9. Published by Ziff. for Posses- Davis Publishing Co., at One Park Ave., New York, NY 10016. Richard P. Friese, President; Selwyn Taubman, Treasurer; Bertram A. Abrams, Secretary. One year subscription rate U.S. and sions. 515.97: Canada. 520.97; all Other countries. 523.97 (cash orders only, payable in U.S. currency). Second Class Postage Paid at New York, N.Y. 10016 and at additional mailing offices. Authorized as second class mail by the Post Office Dept., Ottawa, Canada. and for payment of postage in cash. POPULAR ELECTRONICS including ELECTRONICS WORLD trademark registered. In- dexed in the Reader's Guide to Periodical Literature. Ziff -Davis also publishes Boating. Car and Driver, Cycle, Flying, Popular Photography, Skiing, Stereo Review, Electronic Experimenter's Handbook, and Tape Recording 8 Buying Guide. POSTMASTER: Send address changes to COMPUTERS 8 ELECTRONICS. Circulation Dept. P.O. Box 2774, Boulder, CO 80302. Please allow at least eight 2 Computers & Electronics HUGE ELEK-TEK DISCOUNTS EXTRA BONUS TI -99/4A COMPUTER KEYBOARD SAVE $180 br TEXAS FREE PHP1200 PERIPHERAL EXPANSION -BOX `v INSTRUMENTS with purchese of Eny 3 following items: TI -99/4A Keyboard 149.00 PMP 176 95 212 Cod M. 1280 1.69.3 1646 061 .121 RA'a. MP 1P0 v C Cea C+bd MP 040 D., 05.605.6Cad Less Mfr. Rebate 50.00 DIM PnD2.'P 11Prpr,Mnd544. Price After Rebate 99.00 PNP 12591.Pe4r S.I9m 0-3 11.6 TN'a 1,1/'ax 911 1.1.4 90 156.0 Ser,l Limited Time Offer LIWITED fIME OFFER Mfr. Elek. Mfr. Elio. Mfr. Elek- Sugg. Tek Sugg. Tak Sugg. Tek Model Name Ret. Price Model Name Ret. Price Model flame Rel. Price CONSOLE PMM 3029 44ton 6 56666 II (Sod SMta Speech n PMC 0044 11.9916 Morse Comp.« (.0 RE 40wtl01 22500 44990 5400416 3 6064.14401 3995 3200 POD 560 -I 1ne969136 466 E.p44n and Enne. Ext.». PE RIPME R9LS PO4 3029 4641046n I (Sold 96 Sp.96 SASIC o EdrlcM.rr.44. Canm4r0 Mo0u4 POP 1200 18010 t995 400 9.090.0.1 1.00nson Box 24995 Sy* 0 400ommM010( . 1995 3200 PMP 1220 RS232 Cad 17495 13000 PMM 69 Dv90n (Sad 549 Speech.. 610 5000 Junto 43 36N Menory E 6rneon and En» POP 1240 DM Como. Carp 10124 D99 040690. 669 664.2 59646r 62.66a3d) . 3995 3390 lee.« BA5^. a Ed4344aa.m6a Ca0m4nd 4ofu4 1995 IEO 00 I 1900 un 099 C9nl016 24995 P014 3050 Romeo.. 3995 ]]00 '090..01 POP 1250 1....on Sy6.n 3.19 Dra 1D94 D0. PM4 x51 Nun4rtlonl II 3995 3200 AdoO.. re 14066.. 4661u4 531,., (Dr.lOped by Sc. 466I Cont.. 990691 39995 29510 66610 U]Sdd 4 6410 WAR.11 940. PM4 99961 Dw raro 3059 3 Xal.duK 5padro-+ w ( S15be.cnn 4 646 496696 25% 2490 POP 1260 Memory E.rn.4 Ord (329 RAM) 29995 21500 .0). 5995 4500 POD 562 M9.On 1166L4 2995 2400 POP 1270 PCdr C.d 1329 RAM Merey E.pen.on 4,04.00) 24995 18000 V0M 3000 tlSiW. 5p 1 SUM ro-i..4941415dd 666 PND 545 616 C.009 . 2095 2400 POP 1500 Bad State Spe.cnn Synne9M21 4995 110 00 19 59 95 4590 POD 5949 TM 0604 2995 2400 POP ,600 400010 Coupes 070.0 22495 14500 PM4 3061 St19.K SpI17,y-4r 5(50d 51.
Load more

Recommended publications
  • The Art of Unix Programming Next the Art of Unix Programming
    The Art of Unix Programming Next The Art of Unix Programming Eric Steven Raymond Thyrsus Enterprises <[email protected]> Copyright © 2003 Eric S. Raymond Revision History Revision 0.0 1999 esr Public HTML draft, first four chapters only. Revision 0.1 16 November 2002 esr First DocBook draft, fifteen chapters. Released to Mark Taub at AW. Revision 0.2 2 January 2003 esr First manuscript walkthrough at Chapter 7. Released to Dmitry Kirsanov at AW production. Revision 0.3 22 January 2003 esr First eighteen-chapter draft. Manuscript walkthrough at Chapter 12. Limited release for early reviewers. Revision 0.4 5 February 2003 esr Release for public review. Revision 0.41 11 February 2003 esr Corrections and additions to Mac OS case study. A bit more about binary files as caches. Added cite of Butler Lampson. Additions to history chapter. Note in futures chapter about C and exceptions. Many typo fixes. Revision 0.42 12 February 2003 esr Add fcntl/ioctl to things Unix got wrong. Dedication To Ken Thompson and Dennis Ritchie, because you inspired me. Table of Contents Requests for reviewers and copy-editors Preface Who Should Read This Book How To Use This Book Related References Conventions Used In This Book Our Case Studies Author's Acknowledgements I. Context 1. Philosophy Culture? What culture? The durability of Unix The case against learning Unix culture What Unix gets wrong What Unix gets right Open-source software Cross-platform portability and open standards The Internet The open-source community Flexibility in depth Unix is fun to hack The lessons of Unix can be applied elsewhere Basics of the Unix philosophy Rule of Modularity: Write simple parts connected by clean interfaces.
    [Show full text]
  • Electronics-Today-19
    ','Ïii'l'iiIi'I.i ANUARY 198160p High -Quality FM Tuner Project Universal Digital Tacho Computer Interface - Micro to Mainframe! Astable Design - A Fresh Approach 94999 8K ON BOARD MEMORY! 2 MICROPROCESSORS 5K RAM. 3K ROM or 4K RAM, 4K ROM (link Z80 the powerful CPU with 158 instruction, including selectable). Kit supplied with 3K RAM, 3K ROM. all 78 of the 8080, controls the MM57109 number System expandable for up to 32K memory. cruncher. Functions include +, - /, squares, roots, logs9xponenti , trig functions, inverses etc. 2 KEYBOARDS! Range 10- to 9 x 19 to .8 figures plus 2 exponent 56 Key alphanumeric keyboard for entering high level digits. language plus 16 key Hex pad for easy entry of machine code. EFFICIENT OPERATION Why waste valuable memory on sub routines for GRAPHICS! numeric processing? The number cruncher handles 64 character graphics option - includes everything internally! transistor symbols! Only £18.20 extra! MEMORY MAPPED high resolution VDU circuitry RESIDENT BASIC using discrete with extended mathematical capability. Only TTL for extra flexibility. Has its 2K own 2K memory used but more. powerful memory to give 32 lines for 64 characters. than most 8K Basics! - KANSAS CITY low error rate tape interface. 1K MONITOR resident in EPROM. PSI comp 80 SINGLE BOARD DESIGN Even keyboards and power supply Z80 Based powerful circuitry on the superb quality double scientific computer sided plated through -hole PCB. design as published in WIRELESS WORLD COMPLETE KIT Cabinet size 19.0"x15.7"x3.3". NOW ONLY Television not included in price. The kit for this outstandingly practical design by John £225 + VAT Adams published in a series of articles in Wireless World really is complete.
    [Show full text]
  • Objective Is
    Lehigh Preserve Institutional Repository Design of a microprocessor-based emulsion polymerization process control facility Dimitratos, John N. 1987 Find more at https://preserve.lib.lehigh.edu/ This document is brought to you for free and open access by Lehigh Preserve. It has been accepted for inclusion by an authorized administrator of Lehigh Preserve. For more information, please contact [email protected]. Design of a Microprocessor-based Emulsion Polymerization Process Control Facility A research report written in partial fulfillment of the requirements for the degree of Master of Science in Chemical F:ngim·ering, Lehigh University, Bethlehem, Pennsylvania by John N. Dimitratos June 1987 ,. Design of a Microprocessor-based Emulsion Polymerization .. ,_.,,-•• ·, ,, -i •:>:.·.:':' Process Control Facility ' A research report written in partial fulfillment of the requirements for the degree of Master of Science in Chemical Engineering, Lehigh University, Bethlehem, Pennsylvania by John N. Dimitratos June 1987 •1 to my father and my brother there art times when it is hard to decide what should be chosen at what price, and what endured in return for what reward. Perhaps it is still harder to stick to the decision Aristotle (384-322 B.C) Ethics, Book Ill. Abstract The explosion of microcomputer technology and the recent developments in software and hardware products introduce a new horizon of capabilities for the process control engineer. However, taking advantage of this new technology is not something easily done. H the process control engineer has to undertake such a project soon he will have to deal with the different languages the software engineer and the plant operator use.
    [Show full text]
  • Netpages White.Pdf
    White NetPages NetPages™ is a directory for the Internet modeled after the phone book—with blue, white, and yellow pages sections. In the printed version, all three sections are together. In the e-book version, the White Netpages are one book and the Blue and Yellow NetPages are one book. To access the Blue and Yellow NetPages, send mail to [email protected] for sites. Directory of email addresses for individuals & businesses on the Internet How to Make a White NetPages Listing To add your name to NetPages, send this information to [email protected]. Last name: First name: Email address: Organization name: Job title: City: State: Country: Email address used for business, per- sonal, or both: Your listing will be sent to you via email for verification publishing. Yellow NetPages listings are available for business or organizations. Contact Aldea for pricing. If you have any questions or comments, write to [email protected] or call 1-800-TO ALDEA (619-943-0101). All listees will be notified of the electronic Internet “pickup” spot after its publication. How to get more information about NetPages NetPages is published in March and September. Hardcopy NetPages are distributed at major trade shows and by U.S. mail. Electronic versions are available online (locations to be advised). •General Aldea information [email protected] •Distribution information [email protected] •Add yourself to NetPages [email protected] •Remove yourself from NetPages [email protected] •Receive a copy of frequently asked questions (FAQ) [email protected] •Request a hardcopy of NetPages from: Aldea Communications, Inc.
    [Show full text]
  • Zx Spectrum Manual
    CHAPTER Chapter 17 Graphics Summary PLOT, DRAW, CIRCLE POINT pixels In this chapter we shall see how to draw pictures on the ZX Spectrum. The part of the screen you can use has 22 lines and 32 columns, making 22*32=704 character positions. As you may remember from Chapter 16, each of these character positions is made of an 8 by 8 square of dots, and these are called pixels (picture elements). A pixel is specified by two numbers, its coordinates. The first, its x coordinate, says how far it is across from the extreme left-hand column. (Remember, x is a cross), the second, its y coordinate, says how far it is up from the bottom (wise up). These coordinates are usually written as a pair in brackets, so (0,0), (255,0), (0,175) and (255,175) are the bottom left-, bottom right-, top left- and top right-corners. The statement PLOT x coordinate, y coordinate inks in the pixel with these coordinates, so this measles program 18 PLOT INT (RND*2561, INT (RND*1761: INPUT a$: GO TO 10 plots a random point each time you press ENTER. Here is a rather more interesting program. It plots a graph of the function SJN (a sine wave) for values between 0 and 217. 10 FOR n=6 TO 255 26 PLOT n,66+80*SIN (n/l28*PII 30 NEXT n This next program plots a graph of SQR (part of a parabola) between 0 and 4: 10 FOR n=O TO 255 26 PLOT n,86*SQR b1B41 30 NEXT n Notice that pixel coordinates are rather different from the line and column in an AT item.
    [Show full text]
  • ZX Spectrum Manual
    by Steven Vickers edited by Robin Bradbeer x Second Edition 1983 N @ 1982 by Sinclair Research BASIC programming Front cover illustration by John Harris of Young Artists Contents Contents CHAPTER 1 CHAPTER 10 Introduction Page 5 Mathematical functions Page 63 A guide ot the 2X Spectrum keyboard and a including simple trigonometry description of the display t, PI. EXP. LN. SIN. COS, TAN, ASN, ACS. ATN CHAPTER 2 , Basic programmiBg concepts Page I T Programs, line numbers, editing programs CHAPTER 11 Random numbers 71 using t. + and EDIT, RUN, LIST, GO TO, Page CONTINUE, INPUT, NEW, REM, PRINT, using RANDOMIZE and RND STOP in INPUT data, BREAK CHAPTER 12 CHAPTER 3 Arrays Page 77 Decisions Page 23 String and numeric arrays IF, STOP, DIM =.<.>,<=,>=,<> CHAPTER 4 CHAPTER 13 Looping Page 29 Conditions Page 83 FOR, NEXT, TO, STEP and logical expressions Introducing FOR-NEXT loops AND, OR, NOT CHAPTER 5 CHAPTER 14 Subroutines Page 35 The character set Page 89 GO SUB. RETURN A look at the 2X Spectrum character set including graphics and how to construct your own graphic characters CHAPTER 6 CODE, CHRS. POKE, PEEK. USR. BIN READ, DATA, RESTORE Page 39 CHAPTER 7 CHAPTER 15 Expressions Page 43 More about PRINT and INPUT Page 99 Mathematical expressions using Some more complicated uses of these +.-.*.I commands using separators : , ; ‘, TAB, AT. scientific notation and variable names LINE and CLS CHAPTER 8 Strings Page 49 CHAPTER 16 Colours Page 7 07 Handling strings and slicing INK, PAPER, FLASH, BRIGHT, INVERSE, OVER, BORDER CHAPTER 9 Functions Page55 User-definable functions and others readily CHAPTER 17 available on the ZX Spectrum using DEF.
    [Show full text]
  • 1900 (Parents: 769, Clones: 1131)
    Supported systems: 1900 (parents: 769, clones: 1131) Description [ ] Name [ ] Parent [ ] Year [ ] Manufacturer [ ] Sourcefile [ ] 1200 Micro Computer shmc1200 studio2 1978 Sheen studio2.c (Australia) 1292 Advanced Programmable Video 1292apvs 1976 Radofin vc4000.c System 1392 Advanced Programmable Video 1392apvs 1292apvs 1976 Radofin vc4000.c System 15IE-00-013 ie15 1980 USSR ie15.c 286i k286i ibm5170 1985 Kaypro at.c 3B1 3b1 1985 AT&T unixpc.c 3DO (NTSC) 3do 1991 The 3DO Company 3do.c 3DO (PAL) 3do_pal 3do 1991 The 3DO Company 3do.c 3DO M2 3do_m2 199? 3DO konamim2.c 4004 Nixie Clock 4004clk 2008 John L. Weinrich 4004clk.c 486-PIO-2 ficpio2 ibm5170 1995 FIC at.c 4D/PI (R2000, 20MHz) sgi_ip6 1988 Silicon Graphics Inc sgi_ip6.c 6809 Portable d6809 1983 Dunfield d6809.c 68k Single Board 68ksbc 2002 Ichit Sirichote 68ksbc.c Computer 79152pc m79152pc ???? Mera-Elzab m79152pc.c 800 Junior elwro800 1986 Elwro elwro800.c 9016 Telespiel mtc9016 studio2 1978 Mustang studio2.c Computer (Germany) A5120 a5120 1982 VEB Robotron a51xx.c A5130 a5130 a5120 1983 VEB Robotron a51xx.c A7150 a7150 1986 VEB Robotron a7150.c Aamber Pegasus pegasus 1981 Technosys pegasus.c Aamber Pegasus with pegasusm pegasus 1981 Technosys pegasus.c RAM expansion unit ABC 1600 abc1600 1985 Luxor abc1600.c ABC 80 abc80 1978 Luxor Datorer AB abc80.c ABC 800 C/HR abc800c 1981 Luxor Datorer AB abc80x.c ABC 800 M/HR abc800m abc800c 1981 Luxor Datorer AB abc80x.c ABC 802 abc802 1983 Luxor Datorer AB abc80x.c ABC 806 abc806 1983 Luxor Datorer AB abc80x.c Acorn Electron electron 1983
    [Show full text]
  • 11 De Febrero De 2010 SISTEMAS OPERATIVOS Nivel 5 Traducción
    11 de febrero de 2010 SISTEMAS OPERATIVOS Nivel 5 Nivel de lenguaje orientado al problema Traducción (compilador) Nivel de lenguaje Nivel 4 ensamblador Traducción ensamblador Nivel de de Nivel 3 maquina del sistema operativo Interpretación parcial (S.O) Nivel de maquina Nivel 2 del sistema convencional Interpretación microprogramación Nivel 1 Nivel de microprogramació Los microprogramas son ejecutados directamente por la máquinan Nivel 0 Nivel de lógica digital Maquina Real Sistemas Operativos Como maquina ampliada: es el software cuya función es presentar al usuario el equivalente de una maquina virtual (N3) que sea más fácil de programar que el hardware implícito. Como manejo de recursos: Es el administrador de los recursos ofrecidos por el hardware para lograr un eficiente rendimiento de los mismos. Es un programa o conjunto de programas que actúan como intermediarios entre usuarios y el hardware del computador. Clase de sistemas operativos 17 de febrero Ejecución de una orden: EDIT FUENTE.TXT • Entrada de orden • Interprete de comandos y ejecución del programa • Verifica presencia de Edit en memoria sino lo pasa a un subsistema de archivos( tamaño) • El gestor de memoria asigna memoria • El cargador lo carga • Se crea el BCP • El BCP se matricula en la lista de procesos listos • El planificador elije el programa para ejecución • EDIT solicita al SO la apertura de fuente .txt • Se registra fuente.txt en archivos activos • Dialogo Teclado-pantalla • Termina: guarda, cierre, libera memoria Área de memoria de intercambio –Bufer Objetivos buscados del sistema operativo • Eficiencia: hacer las cosas con la menor cantidad de recursos • Robustez: Capaz de responder a todas las exigencias de los usuarios,” Aguante el uso y el abuso” • Escalabilidad: Capaz de atender volúmenes pequeños y grandes de trabajo, crece dependiendo de las exigencias.
    [Show full text]
  • CP/M Sullo ZX Editoriale
    Periodico di informazione sul mondo Sinclair e Spectrum N°8 Aprile - Maggio 2005 Copyleft 2004 - 2005 Stefano Guida autore ed editore In questo numero: Editoriale 6 - Hardware 1 - CP/M sullo ZX "multipurpose" 2 - Forever demo party 7 - Puzzle-game mania I periodi invernali e primaverili ram. Si parlera' come al solito Come annunciato nel numero 3 - Doors Aqua News 7 - Novità sul fronte sono sempre ricchi di novita' sia delle notizie che sono circolate precedente ci sara' anche un Z88Dk 3 - Un Kempston mouse in ambito software, sia in quello in rete recentemente e ci sara' articolo sul demo party per tutti 7 - QL news e Sinclair hardware. Sono gia' disponibili inoltre un articolo, che personal- "Forever" proprio in occasione meetings 3 - Un lettore ci scrive nuovi giochi pronti ad essere mente reputo molto interes- della sesta edizione che si tiene 8 - Il clone del mese: 3 - Abzac News Elwro scaricati di cui e' stato dedicato sante, riguardante una nota in questo periodo con una in- un ampio spazio all'interno di rivista russa il cui scopo, oltre a tervista a Gasman che gia' 3 - Officine Oniriche 8 - Vignetta, ringraziamenti, sul questo stesso numero. Si par- quello di informare gli utenti conoscerete. Non mi resta altro 4 - Pentagon 1024 e Kay prossimo numero 2005 lera' poi dei nuovi cloni, sempre sulle ultime novita', è favorire lo che augurarvi una buona lettura! potentissimi, per poter apprez- sviluppo di software acquis- 4 - AI Tic Tac Toe zare meglio i giochi che richie- tando programmi e organiz- S.G. 5 - Nuovi giochi dono maggiori quantitativi di zando competizioni.
    [Show full text]
  • Z88 USER Issue 7 the NEW Magazine for Spectrum, Z88 and Emulators
    Z88 USER Issue 7 The NEW magazine for Spectrum, Z88 and Emulators IN THIS ISSUE: New editor drives magazine into the ground ;-) Latest Z88 software reviewed Dennis ‘Pipeview’ Groning interviewed Hacked Off: Jet Set Willy Dissected Spectrum clones from around the world Retro computing - big business muscles in AlchNews Issue 33 CONTENTS 2 CONTENTS & THANKS. Details of the articles I managed to blag for this issue. 3 EDITORIAL. A warm welcome to a new magazine. 4-5 NEWS. What’s happening. 5 WORD ON THE WEB. Some excellent sites. 6-8 BACK TO BASICS. Ken Beer looks at Sound, data and logical operators. 9-10 THE 80-LEC ROM. A new and feature filled ROM image. 11-15 HACKED OFF: JET SET WILLY. Celebrate JSW reaching the Z88 by disassembling it. 16-17 SOLVE THE CRIME. Can you find the solution to this short mystery? 18-21 RIVAL RAGS. A look at other paper based publications you can waste your mo…. Erm, I mean invest in. 22-29 SEND IN THE CLONES. Thought that the Pentagon and Scorpion were the only Spectrum clones? Prepare to be amazed at the ingenuity of Eastern Europeans! 30-31 RETROGAMING. What’s the future of old computing? 32-33 THE DENNIS GRONING INTERVIEW. A peek into the life of this remarkable Z88 programmer. 34 TRADING POST. 35 SUBSCRIPTION and ORDER DETAILS. 36 W.N. Richardson & Co. Advert. THANKS An IMMENSE thank you to the following people: BILL RICHARDSON for getting me to finally move to a paper production - I didn’t want to but it’s too late now! PAUL WHITE, for launching an excellent magazine for me to copy! Excpect legal action forcing us to close! DARREN BRANAGH for starting the Z88 magazine for me! GARRY LANCASTER and DOMINIC MORRIS for their outstanding contributions in keeping the Z88 alive.
    [Show full text]
  • COMPUTER ARCHITECTURE and SECURITY Information Security Series
    COMPUTER ARCHITECTURE AND SECURITY Information Security Series The Wiley-HEP Information Security Series systematically introduces the fundamentals of information security design and application. The goals of the Series are: to provide fundamental and emerging theories and techniques to stimulate more research in cryptol- ogy, algorithms, protocols, and architectures; to inspire professionals to understand the issues behind important security problems and the ideas behind the solutions; to give references and suggestions for additional reading and further study. The Series is a joint project between Wiley and Higher Education Press (HEP) of China. Publications consist of advanced textbooks for graduate students as well as researcher and practitioner references covering the key areas, including but not limited to: – Modern Cryptography – Cryptographic Protocols and Network Security Protocols – Computer Architecture and Security – Database Security – Multimedia Security – Computer Forensics – Intrusion Detection Lead Editors Songyuan Yan London, UK Moti Yung Columbia University, USA John Rief Duke University, USA Editorial Board Liz Bacon University of Greenwich, UK Kefei Chen Shanghai Jiaotong University, China Matthew Franklin University of California, USA Dieter Gollmann Hamburg University of Technology, Germany Yongfei Han Beijing University of Technology, China ONETS Wireless & Internet Security Tech. Co., Ltd. Singapore Kwangjo Kim KAIST-ICC, Korea David Naccache Ecole Normale Superieure, France Dingyi Pei Guangzhou University,
    [Show full text]
  • ZX Spectrum Files
    Publicación bimensual para usuarios de ZX Spectrum y PC Juegos LA ENTREVISTA RAGNABLOCK, FARMER JACK, Daniel Celemin MPTHRILLA, (Lord Fred) PHANTOMASA, THANATOS y BUG-EYES. EL MAPA VIGILANTE De U. S. Gold Encuesta INFORME Los resultados LOS CLONES DEL ZX SPECTRUM ZXSF 1 SUMARIO 2 - Para Empezar. MENUDO verano éste que acabamos de dejar atrás. Es increible que con tal altas 3 - Cambalache. temperaturas hayamos sido capaces de seguir en nuestro sitio y sin desmelarnos lo más 4 - En Pocas Palabras. mínimo, contando como mucho con un buen botijo lleno de agua hasta rebosar. J 6 - Novedades. Vayamos por partes: agradezco de veras la 8 - Comentarios de juegos. participación de todos aquellos usuarios en la encuesta que “impuse” en mi número anterior. 14 - El Mapa. (Vigilante, de US Gold) Tenéis que comprender que antes de encaminar profundos cambios en la realización de mi 16 - Informe. (Los clones del ZX Spectrum) revista, quería saber vuestra opinión, como ya dejé entrever al comienzo de la misma, y las 24 - Resultado de la encuesta. preguntas han sido escogidas con mucho cuidado con el fin último de poder afrontar el 25 - Quisicosas futuro inmediato de ZXSF. 26 - Emulación (Klive 1.1) Asimismo, había un sorteo de por medio y el afortunado ganador del mismo, de entre todos 28 - La Entrevista aquellos participantes en la encuesta, verá su nombre en páginas interiores. Por supuesto, los 31 - Publicaciones. juegos han salido de camino a su destinatario: que los disfrute. 32 - Contraportada. Seguimos con la serie sobre “Ragnablock” ya es una realidad y su “Las portadas de revistas” comentario pertinente lo hallaréis en el interior, así como otro de los últimos juegos de Cronosoft que, curiosamente, también puede descargarse gratuitamente desde World Of Spectrum: “Mpthrilla – The Metal Miner”, un nuevo Redacción, diseño portada y edición: plataformas basado en el minero más famoso Ignacio Prini Garcia.
    [Show full text]