- Second Class Postage Paid at Menlo Park, CA Address Correction Requested FOR THE IMAGINATIVE SMALL COMPUTER USER! I VOL. 8 NO.5 ISSUE 44 ALSO PUBLISHED BY PEOPLE'S COMPUTER COMPANY: DR. DOBB's JOURNAL of COMPUfER Calisthenics & Dr. Oobb's Journal is a highly respected reference journal which fills a unique and Orthodontia solid niche within the microcomputing world. We publish discussions and examples of general purpose system tools, articles on OUR READERS SAY: legislation or trends affecting computerists, a consumer watchdog column, as well as a "Your level of information is fantastic .. the best I" variety of monthly columns designed to guide and help readers wend their way "Dr. Dobb's has presented some of the through the confusion of a new and bur­ best and most intelligent software for the geoning industry. advanced hobbyist. Please, please stay that way I" Recent issues have included: ' An AII·CP/M "Keep up the heavy software, non­ Issue, including an overview of CP/M·compatible commercial, short miscellaneous, unslick, software, the history of CP/M, utilities, inter­ lots of letters approach: it's unique preters, etc. - Mathematical Typography by among Byte, Interface Age, Kilobaud, Donald Knuth - A Microprocessor-Assisted etc," Graphics System ' Interfacing a Home Computer J to a Large Scale System - Improvements to 8080 PILOT 93065JOHNSB09 Dl 22 5 l BYRON JOHNSCN ~Y8 l 356 LAGUNA !ERR S 1M! VALLEY . CA 93065 • Editors' Noles Slafr lO-DAY FREE TRIAL Send for ollr FREE Ciltalog Things at PCC are changing. RecreatfOllal Edilors Compuring has a new slick format, we hope Bob Albrecht March/April 1980 you find it an improvement. There are per· Tracy Deliman Volume 8, Issue 5 $100 FREE ACCESSORIES Hazeltine sonnel changes too. This is the last issue to Don Inman be edited by the four-headed Dragon (Bob Ramon Zamora WITH 16K or 32K PET Immediate Delivery- Albrecht, Tracy Deliman, Don inman, and W","" you buy. IlK Or 321< PET, apply $100 ' ..... 'd PET Copy Ediior KUIOOriH. FREE! Ju, t ,nd,e818 0n your o,dar !hl l you hav.' Ramon Zamora). Begin ning next issue, Dennis AJlison, long_time PCC President, will take Sara Le Forge reduced thl COSI of you, Icc• .,o,l... by $100. SUPER SALEI Publisher TermInal Package with 8K PETs over. The Dragonfolk will continue as con· tributing editors; look for them in the Com­ Ann Merchberger SPECIAL FEATURES . .. ... .. .. S .. Spec.. '_ uierTown USA project, and as authors on these ' ,' ;:. : ,;.- 1500$995 Production Manager .. ...... .. PET ACCESSORIES pages and elsewhere. Carole Cullenbine 1\ REG $1069 4 RECREATION APPLE II HI-RES GRAPHICS Artist Comrno<:lO •• Dual FlOppy DISk Om. Changing Directions AJeeca Harrison by Arthur Wells, Jr. Commodore Print'" (tr>(;ltOn I"""') . Typesetters .. 5195 CommodOre Punt.., nractor leed) Recreational Computf,zg is a magazine of the 18 CRYPTARITH MS • m Second e ...e nt-trom Commoder•. Phyllis Adams .......•...........•.......•. S9t5 Commodor. PET S&rvlce Kit .' future. Even in thi, age of electroni c commu_ Laura Mendell by John Davenport Crehore ,$1,295 Bee~r- Tells wnen laPe i. load&<l nicalion and com pulers, printed periodicals Proofreader 20 PROGRAMMING PROBLEMS & SOLUTIONS ..... $1.295 Petuni.-PI. y mu" C hom PET The AOM·y., Is industry'. t.,ollte dumb term,nll for are one of the best ways to disseminate timely Nancy Heubach Video Butler · Anach anOIM' CRT information. When PCC first Slarted in 1972, by Bob Albrecht & Don Albers PCC Newspaper was the only publication Marketing Director 24 DEUCIO US FUNCTIONS # I nol on kIY·) TNW Bi~Dir. RS-232 printer X-face . deVOled 10 personal and reCTeational com_ Gavin W. Cull en 1;::~~fr~~~~~~W~~Rs--l ComboKIM I IA,- Petuni Singl.a Boaraand Video Compute, BuU., . by Rita Levinson & Ted Kahn roles puting. TodlY everyone has trouble keeping Adverlising &. Irom CommOdore) "" '" II. 1920 euy-!<>-rftad c ~ . r.ct"" in 24 row, of SO lette rl Circulation Manager 30 A NEW ALGORITHM FOR CHESS, PART VI Typewri1er"lyle ~eyboa'd up with the proliferation of computer maga­ 1 RlJ..2"32 C Int.. dace extension POn Zin es. Most magazines have fo llowed the model Michael Madaj by David Chelberg & David Watters 1S-lnch 9·lnch Oi~ct eurOO, • .,dr ....ng we established; oflen they are more effectiye Promotion Altist 41 MORE PROGRAMM ING PROBLEMS & than we have been at PCC. They have had the Sahnla Pannuli SALE' $169 advantage of greater resources (PCC operates SOLUTIONS as a non· profit and has always been a boot­ Sustaining Subscribers by Charles Somerville & Len Lindsay OJOwn,,, strap operation). We don't have the subscrip­ tion base Or the advertising revenues of our Bi ll GOdbout Electronics VIDEO MONITOR competilion. Bul we do have a vis ion of the Byte Publications GAMES Zenllh'. Ilr.t color video dl. play future. Paul, Lori and Tom Calhoun de.lgned .pecilically lor compute,... Louis R. Patzke apple II How will Recreat/mlal Compl/ring change, 9 GAMES CATALOG p/fIs Ttli. '~'I""h mO<1itor i. ZIMt• • I".t cofor "'O&(l ol'~IY Mostly it will be a change of focus and an Retaining Subscribers desig<>e<l ."""ih,,"lIy tor cornpUi"" Fe.tu,,," include expansion of coverage. We want to answer the 12 GALAXY II ou!omallc colo, _. colo, p<"oc ....i ng Ino degaul'lng question, "What would I use 1I personal com· Algorithmics, Inc. by Brett A. Tondreau purer to do?". We believe in the innovative Gerald Bowman FAIRY CHESS Color Monitor $499.00 and creative abilit y of humankind; all too 15 often the other computer magazines (and we David R. Dick by Herbert Kohl too, sad to say) have aVOided the hard problems. Mark Elgin 10i fJlilr 29 AN AM INAL SOLUTION A Calculator, A Sy.tem, Recreations and amusemel1lS will continue to John B. Fried 16K Applin Plus-SI 1951 1"" Sloo 1n f'M ,ee8510.11S) be RC's main thrust, but reCTeations will be by Ashley Henshaw 32K Applall Plus -SIMS Il k. SI50 In f'M ,cceuorilS) A Whole New Stand.rd. interpreted very broadly. We will try to show Scott B. Guthery TRS·80, TINY TREK 'SKApplell Plus -S1'95 ,..,S200ln f'M'Cees,o,I",,) W. A. Kelley 32 HP-41C. how computers can be used in an effective by Milan D. Chepko and innovative way to ilJlprove the quality of William M. Richman II " . "2~ life. We view t he computer as a 1001, Ihe key Phillip A. Smith 33 RAGING ROBOTS .. S<&95 " 10seph A. WeisbeCker C.rd .......... .... ........ $200 to mainlaining individuali ly in an increasingly by Larry Hatch .. .... .... .... ....•. 599 technological society. We want 10 provide Brett Wilson Interl.ce ..... $2:25 windows into the technology to allow every­ 34 'FROGS' FOR THE APPLE ....... ... .............. $5K one access to the tool. A personal computer by Earl Keyser ,,~ should be more than an expensive paperweight. ...... $225 ""_-.__ ... ns.t..::"_._ _ 'C-., ...... .. 35 PLAYING SIMONTM ON THE PET ,. --__0.,..". You Can Help _._£._ ..... by Steve Gull CII ,., • THE SYSTEM. .......,..,. Modulet. $45 Inc'fl'$1 Clpaoly 10 319 I'''!'''''''' We need your ideas. We need your arlicles, IN STOCK NOW! ~\~~~~~~~'~!"_ . $180 Record' P'OO,"m. literate articles on all aspects of computing 'U lAT" SOFTWARE EVERV ITEM IN nus .. OVERTISEMEJf1" IS IN STOCK & dOla 0<110 b,-nk Mlg·c. ,O O 0""/1"0 . __.«_ . ", .. NO RUDY TO SHIP. EXCEPT WHERE NOTEO The PrIn .... $320 Po"O!>I. qUIet. the,ml l oper.tlon. and computer recreations. While we at PCC \"\ope' & lowe, CI$I; plOning rOUlin .... will be developing some of Ihe malerial pub­ O ""__ ... e " ... · 38 PROGRAM INSTRUCTION BUILDER Appllcotion MOdul'" IS<&S ...) Stlnd.,., PIlc ROM. lished in it is you, .... .... --_, Recreational Computing O~_ • •_· PAPER TIGER 440SPE Siolisties ROM. Ma'" ROM. Flnlr1r;i.l Decisions our readership, which will provide the most ",.. ... by Marc B. Stanis ROM. SuMlylnQ AOM _- ...... -. .-"'" The GraphIcs Printer interesting and thought-provOking articles. We _......_ .. ... 39 DATA RETRlEVAL: AN INTRODUCTION ~~.~~~;::~~ ~~~ tb':.I~:wlc'!fc~f~~~ It;:".~;:;~~ Ileed your serious articles and your off· the­ by Ramon Zamora for Apple II CIII I fo' complet" p,Od""t inle Ind opaCs' wall commellts. """,,,,",,uTQ.. .... ,...... ._ _. HP.31E·SciantWc. S<&9.95 . Hp·32E..Advlnced scien­ __ Now you can p,lnt n l~ t,arlon •. blo(:k lene ... cha'I'. tific. $66.95 . HP.33E·Prog •• mmlb\e .,,\entlli<:. S79.95 Even if you are nOI a pOlential author, we o "'c-o.,rw...... ......... g,""~,, .nd mo,e-III ~rI(f", soltwlre conlrel. And .-0"'."' ..... _._ • HI'·J7E-Busin... ffIIl""gemen1. $69.95 · HP.3SE· still want your input. What kind of articles 0 ................ " . DEPARTMENTS wilh the " "l>Inded b<!"e,. the PIper Tige, can ~old tM Aa.lnCad lin.noat $108 shOuld we be publishing? What is important _.rr__ ._... _ lext Irom on entl", 2 '· ~ne-t>y-ao.c"' umn CRT "",een CONTINUOUS MEMORY CALCULATORS Hp·33(;..S1 14 95. HP·:)oIC·51 " 95. HP·:!eC-$I-W ~ now and what will be important in the future? ......... _-- 28 PROGRAMMERS' TOOLBOX You are Out biggesl resource. We also need your financial support. To make .uo_...or ...uu . "....... 42 LETTERS INFORMATION Recreational Computing a continuing success .. ........ ~ .., .... ' ..... ,. ....• oIIlppfng ond ~.ndllng . loll .... , ..Id.nl, odd § 'Io oal... I.. ; - 'oL ~_I. '.' 44 REVIEWS we must have a larger subsCTiption base. Urge VoL'._'.' .• COlftilfued on pg. 43 CO<'er by Sa/una Pannl/tl Recreational Computing (ISSN #0164-5846) is published bimonthly by People's Computer Company, 1263 E1 Camino Real, Box E, Menlo Park, CA 94025.