Surprpart Far

sinclair 7281 - spectres - 81 and

QOLUNE ? piso sinciair

1066 - 1560 - 2663

computers

HAPPY EASTER

Welcome to anather- issue of Timelinez, At the last P.U.C.

VIEW FROM RAN-TOP meetings an obser— vatian was made

concerning the printing af Sinc— Link within this publication. It seems that due to the size and bulk of the text files Cin other words: a lot of kbutes af text eccupies toc manu pases® that conmeisct of SincLink, in affect; ‘comsume® most aqvatliahble room Where articles and projects could be printed. The result of this happened with the January and Februaryu i989 issues. Other observations made were concern— ima the ‘size of text and the unorthodaxed format desian’. may help for those tao look at the format as an cautline. Yes, mares chamaes pave occured im

the paci for SincLink, however s the changes fave been for the better. The concern aver the text size something Like be- ina stuck between a rock and a Richt hs dust imagine takine the SinmcLink section of the February issue and expanding the text to Timelinez format. That means 4 columns comverted ta = aver 3 pages. The result would give you up to and maybe over 12 pages. And that's for an 8 i-Z2 x il page. SincLink is nmormatlyu past— ed up on an & i/f2 id page. Sa you can see all the work that ts involved in creating SincLink. With all this saids and starting with this issue, StincLink sub— scribers will receive their pub— Lication within a Timelinez cover. If you have mot paid for the above, you will anlu receive Timelinez. For those who have Faid for both will receive both. See Timelinez Information for the addresses tao both publica-— tions if imterested in subscrib— img to both.

The Editors....

me. af ey 22 get a Ps 2 , : es | es | Ld

ISSUE &3

1989 $2.58

\_TIMEX/sinclair User Croup Nevs—Magazine—~

MARCH

SR ee es.

NOGRAT

Thank uou very much for your

interest in the Sinclair Horth America Users Group. We apala— gize that we were unable toa re-— turn any inquiries sooner, but as this has become a ‘one man show’ we were unable to answer gall correspondence in a@ timely manner. Thank you For your Ppa tience. With this correspondence we would Like ta bring you up te date on the latest activities of & .NH.U.C.

So what have we been daing all this time? Plenmtyu!! Firstilus we drafted a charter that was de—- eianed toa allow for most provi- sions including expansion. This Wae a veru time comcuming task. The Charter nas been sent ta tne Florida State Secretary af State and wast approved om December 27; 19S. ALL funds up to mow have been held and were deposited imto a checking account on Dec. 31; 1986.

ie have. with the help of the Libraru Committee, established a format to work the Pubtic Domain Software Library. We currently hove cet up Librarians for the following machines and formats:

Head Librarian.......Frank Davis Assist. Head Librarian..Tim Word

2H-S1, TS-1666, TS-1566 Cassette, Larken 00S

Tim Ward, Tony Willing

Spectrum, TS-2ZH66

Cassette co. 2 Sees ee ee Cank Davis A&I Microdrive and Wafadrive.......:.-Andy Hradesky Frank Davis Aerco....e202e2e222Fete Fischer Learken — To Be Announced Gliger 00S......-Paul Holmorens Wittlie Jones, Cary Lessenberry Portugal TNH -— To Be Announced

‘|| TIMELINEZ nevs—magazine is published | TIMEXsinclair pand ts 8 Copyright 1987 bu American iMicroa Systems, Sam Joce, CA 9Sizi1. | user group il TIMELINES may be freely copied for non-— || Commerc tart use onlu. Reproduction in bas Heus- Magazine | whole or in part for commercial means | i i

is prohibited by law.

SUBSCRIPTIONS: 415.66 a year for ten

SUPPORT FOR: i} issues CU.S.-funds ontu — make checks ti TIMEXs inc lair is | Ali other countries please write for 1666, 1566, 2666 details on surface and air mail rates.

Sinclair's

EE 2% Spectrum+ 128K Quantum Leap <GL> || is any change in your current mailing

i¢ ee ee to prevent delay or even loss

3 jaf service.

CHANCE OF ADDRESS: Please notify us by calling or writing cur office if there

| ; payable to fimerican Micro Systems>. a ie TIME? To determine your expir-— | | ation date, read the month posted on ithe right side of your mailing label

For an example, “November would

imdicate that the Hovember issue of the current year would be the last issue Precetued. A form is provided elseuhere

| ta renew wour subscription. We alsa

7 aad ene motice in case you forget. An Heagrelu reneual is veru much appreciated.

| Keep the communication open and let us iknow your interests.

ii if ari

| NOTICE: Contributors to TIMELIBEZ ore ——. t of Americon Micra Systems | and opinions expressed in the contents of this publication are not necessarily | those of the ene staff or its advertisers. Aimericarn Hicro Systems will not be held liable for any damage or consequences resulting from instru- |

| DESK-TOP PUBLISHING | | FOP THE SINCLAIR GL! ee i ROQGZ ine’ e confent, It is recommended that myone attespting to modify their

| clions, assertions of faces revieu of products or companies provided in the

computer or constructing an electrical preject should seek help from sore

TIMELIRE? ere eS ee eee

IKFORMATIOR

peers jee a a a

Managing Editer: Andy Hradesky Nake all HeL Exchange €a—Edttors: correspondence ta: TYS-PUG: George Nockridse T/7S-SUUs Bill Miller—stncl ink TIMEL INEZ ST-EBZUG: chm Ezike PsOu- Box iste TCU TY’S_SIG: Mark Wahl Pacifica, CA 34644 TAS-BAN.Inc: George Featherman ATTN: Geeorse Moackridge

fidvertising: Back issues of TINE- Gil Blasingame LINE?, 7/33 thru 12°87 George Mockridae Comtact Bitl Miller

at:

Exchange: T/“S-PUG: Georse MNockridge SincLink T“S-SUU: Bill Miller «SLIk> 6675 Clifford Drive TAS-BAMN: George Featherman Cupertino, CA 95614

fidvertising Scheduie: Iesues 1°85 -— present,

Full Page: . $46.88 contact your editor at Half Page: $26.46 American Micra.

if4 Page: . - & &.88 if“& Page: - - $5.66 The PDSE Library is = = now available ta all; imerican Micra Systems covering T/Sigga—-i50G, 2175 fbere Ed. #262 T’S 2668, Spectrum and San Jose, CH 95121 the GL. (498) 276-9738 Contact American Micre CompuServe IB# 72267 ,3572 for further details.

CompuServe IB% 72166, 2011

IMELINEZ | vette

$.H.U.6. COHTINUEDR....

GARE ate bhecers Famex SPOOS -— To Be Announced

q Quantum Leap cOL> Microdrive

Ploppu Btee cos 6 seles Tim Stoddard

Softucare and Eprom — To Be Announced

We are currently assessing wheat programs qualifu for Public Domain and we are gathering pro orams at this time. We cannat Sive am accurate number of pro- srams available, but we have conservatively estimated ta have on hand approximately S54 Spec— trum and TS2665 programs and 2746 esaci and TSiGG6 programs as of January 1, 1989. We have been qgdvised that several Commercial

Programs have been released into |; the Public Oomain. GQnce all the details are arranged, an an-—

noumcement will be made.

Wie have alco been truing ta Put together a Publication Committee to determine how our Magazine will loci: comtents. Several of dents expressed interest in writing articles, sa we should have several first time uriters With some mew applications.

=. . —. amd itts

At this time cur membership rates are £12.66 for individual and $15.86 for User's Croup. We are im the process of determin— img elections. The process is ongoing through the manth of March and announcements of officers should be made oan 25) 1989.

aes

April

The current officers are:

Mel Hathanson — Acting Chairpersons Pro-Tem. Foul Hotmoren —- Acting Vice-— Chairpersons Pro-Ten. ‘JC’ Cushran — Acting Treasurer ; Pro-Tem.

John

The offices that will be voted om consist af:

let Vice-President 2nd Vice—-Precident

President Secretary Treasurer

tie ele! tie Stocelcrcit

cur respon |

| | | | | | | | | | | | | | | | | | | | | | | |

i Ficult enough

iwhyu a window

; useful. i Sone | stores

We hope that this press release will ansver most questions. We alsa anticipate your joining the arganization. There is samethinga special about a persam willing to take a chance on an idea that hes noth— ing immediately tangible ta be had for their hard earned money. It takes a@ person with visions courage, and some money that they don't need right auay! Ideas with as much scope as the one we are attempting are dif- to pull of fF with- out individuals such as the Charter Members and without your help, I really don’t think this much could have been accomplish— ed. Be proud — there are not many of you cut there. We Thank

you. Mel Nathanson i$.N.U.E6. f7215 Arbordale Or.

Port FRicheu,;

ie S466S

Sas Sr eS SCREER <peertp BY LT one EER*R é

~Y SHENSON X

The follouina prosram al lous

the user to peek the screen

and find cut what color a@ par— ticular pixel’ is. The program works amlu for the Hiach Fes. mode t4 colors. I have tried to make it work for Lou Fec. mode, but have had ma tuck at all.

There is one thing to remem— ber when using the program. If you use a block command for a Particular uindou, the block appears relative to the windou The SCREEN PEEK'F dees mot work relative to any window. This is the size of the display is defined.

Hope you can find the program At the least it gives imsicght as to how the GL the screen.

1@6 118 126 136 146

REMark REMNark WINDOW CLS

x=168 :

SCREEH PEEK'R bu LT Timothy Suenson 512 ,256,6,6

y=1235

IMELIRE?

SCREEH PEEE‘R CONTINUED... .

1i5@ BLOCK 1,1;x;u;8 i6@ red=@ : green=-& 17 pix=1sierst+ Cy#1 289+ CINT tx“S> *2> ifG@ peeki=PEEK tpix> 19a im=peeki =: dectohin 266 peekit=outt 21G@ peek2=PEEK (pixti> 2208 im=peek2 +: dectcbin 236 peekZt=outt 24G bit=<tx MOD &>+i 250 green=peekif tbit> 266 red=peekZ74 tbit> 276 IF red ANDO green THEH PRINT “WHITE” 2780@ IF WOTtred> ANDO NOT Coreen. THEW PRINT “BLACK” 296 IF red AND HOTtgreen> THEN PRIHT “RED” 20@@ IF NOTtred>? AHO oareen THEN PRINT “GREEN” 31@ RENark #4#44S EE EREEEE 370 DERFine PROCedure dectobin 338 outt="" 346 FOR z=7 to @ STEP -1 358 LET temp=ine’(27= 368 IF temp>=1 THEN 378 outt=outte"1" 3ea in=in—-tINT ctemp> Ha 7=5 394 ELSE 468 outh=outte."s" 418 EWD IF 4270 WEXMT = 436 ENWD DEF ine ae ghee ss ee eet eS Sa t SS Lee 0 | einer | EERE f.. 1 ft i t i E | ———J— 0 OAC pees {@; i It is impocsible ta make any

programs foolproof because fools are soa ingenioqus. to recurses

To iterate is human:

devine.

just Like if you're

octal is decimals fingers.

Counting in counting in missing tua

just Like if you're

binary is decimals

Coumtina in counmting in att thumbe. CS

Don't sweat it’s onmly ones

and zeros.

To err is human, to really foul— up requires a computer.

i | { | | | | i | | | | | |

Dear Fellow TSers;s

im your Public

I use & the 2868 and I am currently truing ta set up a Softuare Conmmection of

Hi! I am interested Participating Domain Suapping Program. the TS-16@6, 1506,

Buying and Selling TS SW cand

some HLS .

loam looking forward ta being im contact with several TSUCG's. Mu address is: Chartes Ridauay 2816 Chestnut San Angetas TH 769R1 #°915>

Mu Phone a42-F7564

Thank you —

Tear Sir or Nadames

I would like as much information as possible on supplies, publi- cations, newsletters, softucres etc., available for mu TIMEX sinclair 2481-1886 computer.

Tf you have anu information at ail, please help me bu writing a feu lines. Thank you.

Futh M. Engel 14699 HE 18th Avenue ‘tél NH. Miami, Florida 33181

With regard to the attached label. Whu did you decide to place “Mrs” in front of my name? Have problems with “MNs"? Also the name of the toun ends with an “o"™ not an "a". Kindly cor rect the mailing label. What's the telephone number to Kevin Leung's BES?

Ed. note: Your label is correct— ed, I guess I was viewing you

optimistically. Kevin's BBS # is C4150 753-5265. My apologies for mot printing it in Jan."s issue.

-. e

IMEL TNE Zoe

TS CHAOS

CHAOS is everywhere-the stars, weather, columns of smoke, biology, noise on a phone line. It is a new math. It can be studied on your TS computer.

The CHAOS equation I've selected here was used by biologist Robert May in the study of fish populations in a pond. x=rx(1l-x) where x is a stable fish population for r which is the food supply.

(What we are looking at here is the

equation. Using fish is just an example).

Lines 110 and 140 of the TS1500 Program set the initial value of x and then re- calculate x 200 times to stabalize it. Next, x is calculated 300 more times and is plotted against values of r. The result is shown in Figure 1.

In the CHAOS region from r=3 to 4, x may have one of two values, four values, or even any value between two fixed limits.

TS150@ PROGRAM CHAOS

_108@ FOR R=2.95 TO 4 STEP .@1666

1 TO 282 REX¢(1-X) Ae

TO 30a 16@ LET X=R#x#(1-x) 17@ PLOT ee et ee ee

230 LET x

3 ca

Figure 1. TS1500 CHAOS

447

by Bob Orrfelt

The TS1500 Program takes about 15 minutes to run.

To convert. the TS1500 program to a TS2068 program just eliminate the FAST and SLOW and change the STEP and PLOT. RUN this and you get Figure 2 - the same thing but with more detail.

The figure has Mandelbrot properties. It can be magnified indefinitely and similar figures will appear.Sequences of 3, 6, 9 and even 7, 14, 28 can be found. The Sinclair BASIC calculates to 8 places giving plenty of accuracy for magnifi- cation.

TS2868 PROGRAM CHAOS 2 LPRINT " TS2068 PROGRA H :

1@ FOR r=2.95 TO 4 STEP .@G4

Ta 20a 4@ LET M=Ce*xe(1l-x)

6@ FOR iz=i TO 300

7@ LET x=rexeti-x)

8@ PLOT (e5@0er-745! ,17Ssez S@ NEXT i

ba a 112 LPRINT > LPRINT

3 (Ri a Figure 2. TS2068 CHAOS.

Instead of magnifying the figure, let's back off and look at the whole figure. For values of r beyond 4 x may become negative and has no meaning. The possible value of r then is from 0 to 4. A STEP of 1/64 will give us 256 points to PLOT. The PLOT scale must be

ie a oT Ieee ee

IMELIRE? a a

TS CHAOS by Bob Orrfelt

adjusted so the figure will fit on the screen,

ing with the initial condition x=.3. Notice the first generation forms a diagonal straight line.

| | Using the fish example, for r=0 TO 1 the population crashes (no fish). From 1 TO | 3 the population increases with the food supply. From 3 to 4 is CHAOS. In the | CHAOS region the fish population will change from year to year. The wildest swings will be at r=4.

TS2068 PROGRAM CHAOS

2 LPRINT “" TS2e6s PROGRA M@ CHAOS"

4 T S-LLISt 1@ FOR r=@ TO 4.095 STEP il-vd4d

20 LET x=.3 3@ FOR i=i TO 208 4@ LET x=rf#xzti-x)

5@ NEXT i ae

6@ FOR i=1 TO 300 eel ; 7@ LET x=rexeti-x) ee | (R) a 8@ PLOT (63.754r) ,x#175 ieee

9@ NEXT i :

10@ NEXT & Figure 4. All generations.

11@ LPRINT :- LPRINT : 3 ; ;

128 COPY Figure.5..is a: pilot of-1-vser.. This

4 124 LPRINT " tRi to settle down to one, two, or four 126 LPRINT : LPRINT : LPRINT | values. If i is 175 or larger it is

plotted on the top line.

— ee

H | Y pea mbes 2. 1 e shows the number of generations it takes i i { i

Lo] Le . fu

Figuee-3. Complete plot: Figure 5. Number of generations.

What can we learn from all this? Check- ing r=4 we find the 507th generation is 99.999994% of maximum and the 508th generation goes to 0.000025%. But after all it is only an equation.

Figure 3 shows the complete plot of the equation for values of r=0 TO 4.

So far all these plots have been for a "stable population.'"' The first 200 generations have been discarded. Figure

4 shows the first 200 generations start- | (See Scientific American July '87 pg 108)

rey i) -.

IMELINEZ

POTENTIAL NEW MEMBERS

PLEASE COMPLETE THIS INTEREST CARO BELOW ANDO SEND YOUF 415.66 MEMBERSHIP WITH YOUR CHOICE USER GROUP TO:

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MEMBERSHIP INCLUDES FREE ACCESS TO THE POSE LIBRARIES ANDO A OHE YEAR SUBSCRIPTION TO TIMELINEZ.

USER GROUP MEETINGS ARE ALWAYS OPEH TO THE PUBLIC AT NO CHARGE. GUEST ARE HIGHLY ENCOURAGED TO ATTEND.

HAPPY COMNPUTIHG...... THE EDITORS

Deere ne a NANE:

ABBRESS:

5 (a ee ef ee

PHEKE: WERKE: HOU BIS YGU HERE ABGET BS? FRIES CONPETER ST8RE

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MEMBER/FRIEKB car aa '

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DALY CITY, COLIFORHIA 34613 (415) 878-1773

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BATES:

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MARCH 19, 1389 APETL 16, 1989 may 21, 1989

TifeXsiactair SILICON GALLEY USERS 6675 CLIFFORD BRIVE

COPERTING, CALIFGERIA 93019

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BILL AILLER

LEST GEBRESBAY GF EGCH MONTH - 7:36 COPERTING LIBEREY E

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MARCH 29, 1989 APLIL 26, 1989 maY 31, 1989

TAS-BR, TRC. RAPA BND SURCORST BAY AREA MICEO-

COMPUTER GSERS* GROG, Int. 5956 46TH AVENUE NORTE SAINT PETERSBORE, FL 33769 (813) 346-4278

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MARCH 11, 1989 BPRIL &, 1995 fay 13, 1989

IMELINEZ

bbe OMPUTER | | See

NHETUGRE — What a fisherman does when he's mot fishing.

OFFICE INFORMATION SYSTEM — The word processor who knows the moct gossip.

OHM -— Where the ‘Eart is!

OUTPUT DEVICE — A word proces— sor who can't say "NO!"

PLASMA DISPLAY -— A bloody nose.

PROGRAM - A random callectian of Buas.

RERD/-URITE HEAD - Men’ s room with a graffiti wall. oe)

RUHKRING HEAD — One which needs the handle jiagted. ,

SILICGH - A foolish prisoner.

SKEW — Interface betueen comsenting commuters.

SEEUW FAILUEE — Premature calcu- lation.

SOQFIT@REE — What hackers wear under theie hoarduare.

SOFTUARE STGRE — Frederick's of Hol buwood.

AMERICAN MICRO SYSTENS 2173 ABORN ROAD #262 SAN JOSE, CA 95121

STANDARD OPERATING PROCEDURE —

| The wou mobody does it.

TAPE PUHCH — A non-alcoholic drink that comes on a roll and sticks to your fingers.

TELEPACK — A brevery that deliv— ers.

TERMINAL INTELLIGENCE — To be soa smart it kills you!

Here are some “cookies” that I pulled off of a BBS years ago. They wight be usefull in filling small spaces in TIMELINEZ. J hope they can be of use. .secseees eran LT Ti Suenson

Digital circuits are made from analog parts.

-finy IC protected by a fst acting fuse vill protect the fuse bu bloving first.

Give: Support the helpless victies of computer error.

“Shift te the left, shift to the rioht, mask in, mask cut, Bute, Bute, Byte.

-Your proaram is sick! Shoot it and put it out of its memory. -Every interesting Progr aie has at least one variable, one branch, Gd OPE lOO seeeceeesent And at least one bus!

“If it works) Don't fix iti

Hoy ofl your PiSHes be POPed.

-Ie qmticen tering! @ rester-farian? -Basic‘is a high-level languish.

-Constonts aren't: variables don't.

“Computer proaromeers never die, they just get lost in the

cna # disk you can seek forever, 7 -l'm all for computer dating; ¥ t one te marry a Teabees cee ile. eee i, as of venwruty topey~thee-peexr ait ~~ tting theming”

ital ey

“Recursive, adrry ett Recursive. cilhon computers uouid destroy, they must first drive insane, (i programmers vant arrays.

FIRST CLASS MAIL

we nothing te Geet ETE Ripe

anal

ell

Shen eae