Sinclair ZX80 / ZX81 / Z88 Forums

I have at the moment no means to test it (my dev environment is broken), but the following program should be able to fully load 1008 bytes into memory (from 0x4000 to 0x4400 - 16 bytes)... The block to be load should be saved with standard routines and should be equal or bigger than 1008 bytes (if b...

384 lines :o :o :o what type of sourcery are you trying to use?? I was thinking about the fact that since the ZX is "executing" the display and on a standard machine if I remember properly just 25% is left for the program execution, doubilng the "execution of the display" should not be possible sinc...

... Advantages: 1. will load from 4000h instead of 4009h allowing to immediately fill this space with data 2. will allow immidiate utilization and filling of system variables needed by BASIC (program will start immediately the machine code) 3. will avoid the basic program skeleton to start the mach...

Beautiful collection!!!

This is an interesting thread. Is a long time that I was thinking that in order to fully (at least to the maximum extent) utilize the 1K memory it would be good to have a extremely small piece of code that (also reusing the standard load routines) could load programs. It means that first you would l...

As an additional comment, if you don't need floating point or flicker free running screen, ZX80 basic is both more efficient on memory and much much faster!

A bit longish but very nicely done. This series of videos take you step by step to the final design: 1. https://www.youtube.com/watch?v=pVQJxV9JCSE - ZX80/81 Video circuit generated from scratch 2. https://www.youtube.com/watch?v=T5yu_0K32s8 - Video circuit revealed, hi-res display of 256 x 192 pixe...

Here online in case useful: https://archive.org/details/zx80operati ... l/mode/2up

custom keycaps might be better than stickers...
here a video with all the explanations: https://www.youtube.com/watch?v=c1G5rX_YvCA

This may be a very niche area, but I’ve recently pulled together code from the community to create a ZX80/81 emulator running on the Raspberry Pi Pico I've not a pico around me just now but for what I've seen I would like to give my plause to you @Exile !! PS: for information I'm trying to have an ...