Search found 3 matches

by retrofan8081
Tue Jan 12, 2021 2:52 pm
Forum: Development
Topic: Interrupt handler
Replies: 3
Views: 243

Re: Interrupt handler

Thank you! I have updated my code now and it works like I wanted it to. start: ld ix,isr ; make rom call my code instead ret ; back to basic ; ------------------------------------------------------------ isr: ld a,r ld bc,$1901 ld a,$f5 call $02b5 call $0292 call $0220 ; do whatever you need to here...
by retrofan8081
Mon Jan 11, 2021 12:36 pm
Forum: Development
Topic: Interrupt handler
Replies: 3
Views: 243

Interrupt handler

Hi all, I know this comes up from time to time and I've looked through the forum for clues and one post had something promising but I'm stuck. I'm starting to learn machine code and I'm pretty good now but I want to be able to do something like the 'nova' prgram does and that's put some thing on the...
by retrofan8081
Thu Oct 29, 2020 7:18 pm
Forum: Hardware
Topic: Is my ZX81 ULA dead?
Replies: 3
Views: 1182

Re: Is my ZX81 ULA dead?

Just guessing but maybe you should peg reset at 5v?