wai doesn't appear to wait for an interrupt. If I enable only the vsync the attached .prg should draw one dot every frame, so slowly draw a line from 0,0. (The colour is the value of ISR.) So should be $01 (vsync) + $08 (aflow)
In the emulator as wai is not held, the image is all $08 apart from the one tick where vsync is set. I've included a second .prg where there is no wai, and the output is the same indicating that it is not actually doing anything.
Yazwh0
commented
1 year ago
waidoesn't appear to wait for an interrupt. If I enable only the vsync the attached .prg should draw one dot every frame, so slowly draw a line from 0,0. (The colour is the value of ISR.) So should be $01 (vsync) + $08 (aflow)In the emulator as
waiis not held, the image is all $08 apart from the one tick where vsync is set. I've included a second .prg where there is nowai, and the output is the same indicating that it is not actually doing anything.example.zip