Search found 60 matches
- Thu Aug 06, 2015 9:34 am
- Forum: Development
- Topic: Time Available For Application Code On ZX81
- Replies: 22
- Views: 7643
Re: Time Available For Application Code On ZX81
Well, the easiest way to get an answer will be if somebody runs the test program on a real unmodded ZX81
- Wed Aug 05, 2015 6:46 pm
- Forum: Development
- Topic: Time Available For Application Code On ZX81
- Replies: 22
- Views: 7643
Re: Time Available For Application Code On ZX81
Andy, I don't have a real ZX81 available, it would be interesting to see what result my program (above) gives on one. My "target platform" (oh ho!) is a standard, unmodded ZX81, without any improvements, UK version. (There's no way my intended code will get done in the time available on the US versi...
- Wed Aug 05, 2015 12:17 am
- Forum: Development
- Topic: Time Available For Application Code On ZX81
- Replies: 22
- Views: 7643
Re: Time Available For Application Code On ZX81
I will write a personal apology to Americans on my software
- Tue Aug 04, 2015 7:43 pm
- Forum: Development
- Topic: Time Available For Application Code On ZX81
- Replies: 22
- Views: 7643
Re: Time Available For Application Code On ZX81
Well, 18,200 clock cycles per frame multiplied by 50 frames gives about 910,000 or .91 MHz, so they're in the same ballpark. 0.81 Mhz would be about 16,200. Maybe the EightyOne emulator is not quite accurate in this regard. *EDIT* Seeing your edit PokeMon while I was typing my reply, I take it I nee...
- Tue Aug 04, 2015 6:33 pm
- Forum: Development
- Topic: Time Available For Application Code On ZX81
- Replies: 22
- Views: 7643
Time Available For Application Code On ZX81
As mentioned in another thread, I'm re-learning the ZX81. I've been trying from various sources including here to get an accurate measure of how many clock cycles are available to the programmer per frame. So in the end I wrote a short assembly routine to test it. It simply zeroes the BC registers t...
- Sun Aug 02, 2015 9:09 pm
- Forum: Development
- Topic: Hello, I'm Restarting ZX81 Programming After... 30 Years
- Replies: 37
- Views: 11007
Re: Hello, I'm Restarting ZX81 Programming After... 30 Years
It was just to show you how I'd worked out how to set up my own display file
Yes, I know about saving space with unexpanded lines, I'm already planning cunning things with that
Yes, I know about saving space with unexpanded lines, I'm already planning cunning things with that
- Sun Aug 02, 2015 9:05 pm
- Forum: Development
- Topic: Hello, I'm Restarting ZX81 Programming After... 30 Years
- Replies: 37
- Views: 11007
Re: Hello, I'm Restarting ZX81 Programming After... 30 Years
Yes it does. It's just the display file bit at the end that mattered, not the machine code
- Sun Aug 02, 2015 8:50 pm
- Forum: Development
- Topic: Hello, I'm Restarting ZX81 Programming After... 30 Years
- Replies: 37
- Views: 11007
Re: Hello, I'm Restarting ZX81 Programming After... 30 Years
Yes, I think I'm getting the hang of it now. I just had trouble getting it to compile when I removed the "include" for the Display File, until I looked at the structure of the files and saw better how they function. This is just a test program (it does nothing of any great use except print to the di...
- Sun Aug 02, 2015 4:48 pm
- Forum: Development
- Topic: Hello, I'm Restarting ZX81 Programming After... 30 Years
- Replies: 37
- Views: 11007
Re: Hello, I'm Restarting ZX81 Programming After... 30 Years
PokeMon, I'm making progress with ZX-IDE, but I am a bit stuck with something. I want to include a "pre-drawn" display file with my program, so it loads in the screen (from which I can copy data at the start) but I can't figure out how to set this in the ZX-IDE. Can you advise please? Edit: It's oka...
- Sun Aug 02, 2015 11:42 am
- Forum: Development
- Topic: Hello, I'm Restarting ZX81 Programming After... 30 Years
- Replies: 37
- Views: 11007
Re: Hello, I'm Restarting ZX81 Programming After... 30 Years
Thanks PokeMon, I'm working my way through understanding and familiarising myself with all this