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Re: SHREB Quickies
Posted: Sat Jul 23, 2022 7:00 pm
by 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
Moire Patterns "Fans"
Posted: Mon Aug 01, 2022 9:03 pm
by 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
Re: SHREB Quickies
Posted: Mon Aug 01, 2022 9:54 pm
by Moggy
Ok on real zeddy and spand too.
Circles
Posted: Sat Aug 20, 2022 8:10 pm
by GCHarder
Requires Static RAM at 8K-16K for WRX display file.
- Screenshots
More Moire
Posted: Sat Aug 27, 2022 7:46 pm
by GCHarder
Some more moire patterns.
Requires static RAM at 8K to 16K for WRX display.
Regards;
Greg
- Screenshots
Impossible Figures:Penrose Triangle
Posted: Sat Sep 03, 2022 6:43 pm
by 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
Re: SHREB Quickies
Posted: Sun Sep 04, 2022 6:36 pm
by jdfan1000
That’s so cool, Greg!
Would you be interested in talking with some TS enthusiasts on Zoom sometime?
David
Computer Art
Posted: Wed Sep 07, 2022 8:50 pm
by GCHarder
Spectrum to SHREB downgrade?
SHREB and Spectrum versions included.
Requires static RAM at 8K to 16K for WRX display file.
Regards;
Greg
- Screenshots
Polygons
Posted: Fri Oct 07, 2022 9:31 pm
by 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
3D Fractal Landscapes
Posted: Mon Jun 12, 2023 9:16 pm
by 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