Sinclair ZX80 / ZX81 / Z88 Forums

Short programs written using SHREB 3.0 (Software Hi-Res Extended BASIC).

SHREB manual...

https://sinclairzxworld.com/viewtopic.php?f=10&t=1441

Hardware required: Static RAM in the 8K-16K area for the WRX display file.

Greg

wow. a ZX81 can do that? Back in the day, static RAM was hundreds of dollars so I never got to see it. Nowadays it's only $4

The programs says "DICK WAGNER CCATS 12/90". What is CCATS? timexsinclair.com says that Dick was the editor of the CCATS User Group newsletter. I looked at this newsletter online and it's from my neck of the woods in Oregon

Clackamas Computer Applied Training Society "Computing the Future - In Clackamas County"

Wow again. I was there several times a year circa 1988 (my grandparents lived in Clackamas county). But I didn't know about users groups back then i was living on the Pacific ocean in a very rural area. In fact I only knew four other people that had Sinclair machines. Now i see there was an active user's group not too far away. In 1991 when I was on vacation in California i went to a user group meeting at Stanford but they were only talking about Sinclair QL or something i'd never heard of before ...

Come to think about it, one of the reasons I went to the Stanford meeting was me and my friend were discussing how neat it would be have HiRes. We even called an old advert about it. It was a guy in New York, but the lady on the phone said he had "moved to Israel" ...

CATS=Capitol Area Timex/Sinclair Users Group (C.A.T.S.)

This program came from one of their newsletters.

https://archive.org/details/cats-newsle ... an%201984/

Static RAM may have been expensive back then but I doubt hundreds of dollars as I would have been too cheap to buy it at that price!

Greg

Circle² by Mel Richardson from Sinc-Link v4n6.

Produces odd symmetrical-asymmetric images

I've modified the original program to display full screen images.

I've also included a standard ZX81 version of the program.
This is handy as a "preview" app as the Hi-Res version
can take quite a long time to complete.

Tested in emulation only using sz81 and EO. Set speed to
maximum on both.


Greg

GCHarder,
Thanks for the CATS Newsletter link. I was a member in 1985-1986 before moving back home from DC. I may have submitted an article or two for it. I'll have to look at them when I get a chance.

Chaos Game by Bob Werner

from

Sinc-Link v08n5 Sept-Oct '90

Includes SHREB and ZX81 versions.

I've modified the program for full screen display.

Also, there was a slight bug in the original program, line...

230 LET roll=INT(.5+RND*3)

has 4 possible outcomes 0, 1, 2 or 3 which distorts the results.

This line should be...

230 LET roll=INT(RND*3)+1

which has 3 possible outcomes 1, 2 or 3.

Greg

Hey! There's a wikipedia article on this: Chaos game

The ZX81 version works fine

For the WRX version, I used EightyOne configured for:
* 16K
* WRX graphics
* RAM in 8K area

And to speed it up, changed the Speed to 32x (the fastest setting available) with frame skipping. I've never used the speed setting before but it's handy for this program

MODified Shapes For IBM by Paul W. Carlson
from
COMPUTE! v08n06 May, 1986

MODified Shapes For T/S by Peter McMullin
from
Sinc-Link v4n3 (MODified Triangles) and
Sinc-Link v4n6 (MODified Squares)

The Sinc-Link programs were originally designed for the John Oliger video mod for the T/S 1000.

I wish I could get one of these and JOBASIC!

More info...

https://www.timexsinclair.com/product/v ... e-project/

Tested in emulation only using sz81 and E0. Enable WRX mode and
8k-16k RAM before LOADing.

I've also included "Spectrum" and "QuickBASIC" versions of the
programs.

Download QB64 to load and run the QB programs.

Greg

Works on real ZX81 with Zxpand too, only the quit key doesn't work so have to wait for display finish or stop manually if you want to move on but apart from that bloody great stuff as usual Greg!