Скачать или смотреть ZX81 Mazes - using ROM lookup for random number

https://adrianpilko.itch.io/zx81-maze
Here you see that the user has to press S to start, and during this random length of time the a 16bit count is made of the time upto the size of the ROM (8K). This starting random seed is used to lookup into the ROM addresses 0 to 8191 - the value at that address is and'd with 0x01 and then the count incremented. This gives quite a good random number, I've found better than using the r register.

z80 assembly language (assemble using pasmo)
https://github.com/AdrianPilko/zx81-m...

Trying to follow the following book and make a better random maze:
http://www.mazesforprogrammers.com/

Eventually hope to have a game where you follow through screens of random mazes collecting items and solving puzzles.
#zx81, #retrocomputing