SHREB Programs

[GCHarder]

The hotkeys keys aren't active until the image is completed. You could run the drawing routine in FAST mode by replacing line 9180 with 9180 FAST.

Greg

[GCHarder]

Moire patterns

Requires static RAM at 8k-16K for WRX display file.

If you have RAM between 32k and 40K, ie ZXPand, then a "Small or Large Moire" option will be available.

Tested in emulation only using sz81 and EO.

Regards;

Greg

[Moggy]

Ok on real zeddy and spand too.

[GCHarder]

Requires Static RAM at 8K-16K for WRX display file.

Screenshots

[GCHarder]

Some more moire patterns.

Requires static RAM at 8K to 16K for WRX display.

Regards;

Greg

Screenshots

[GCHarder]

and "Opus"

Programs require static RAM at 8K to 16K for WRX display file.

These programs make extensive use of SHREB's "FILL" command. As I recall this was a pretty hard routine to program.

Regards;

Greg

[jdfan1000]

That’s so cool, Greg!

Would you be interested in talking with some TS enthusiasts on Zoom sometime?

David

[GCHarder]

Spectrum to SHREB downgrade?

SHREB and Spectrum versions included.

Requires static RAM at 8K to 16K for WRX display file.

Regards;

Greg

Screenshots

[GCHarder]

There are four versions of "Polygons" included in the zip file...

Polygons-P.p ..... Pseudo-Hi Res Requires 16K ZX81 with standard ROM, LOAD "POLYGONS-P;X" in ZXPand.
Polygons-W.p ....WRX HiRes Requires 16K ZX81 with static RAM at 8K to 16K for WRX display file.
Polygons-S.tap .. Spectrum Requires Spectrum.
Polygons-Q.dos . QuickBASIC Requires DOSbox.

This is an MSDOS exe program, replace DOS with exe to run in DOSBox or load Polygons-Q.bas in QuickBASIC 4.5 running in DOSBox to avoid the exe file.

Tested in emulation only.

Enjoy;

Greg

[GCHarder]

After 35+ years here's an updated version.

3D Fractals for ZX81.

The hardware requirements...

You will need a ZX81 (or TS1500) with "64K" RAM. By this
I mean that you have to have RAM from 16K to 64K. You also
have to have 8K of static RAM, mapped 8-16K, for the
high-res display file and associated data.

I used to have the hardware to run this on a real ZX81, but
alas no longer, fortunately there are ZX81 emulators that
will do the job. The program was tested on the EightOne,
sx81 and NO$ZX emulators.

Video demo...

https://www.youtube.com/watch?v=9TCQ3sa2qLA&t=623s

Enjoy;

Greg