At 12:50 PM 4/15/99 -0700, you wrote:
>
>The Tempest self-test routine doesn't use an ISR and just hits the
>"reset" and "go" with software timing. My menu is more like the "game
>mode" of Tempest in that I have an ISR that's triggered by the hardware
>at about 4ms intervals, and then every fourth time through it tells the
>vector generator to draw the display list.
>
Clay,
This might be pretty obvious (or I missed it in the code), but are you
acknowleging the irq in your isr?
i.e., does your isr look something like this in the beginning:
ISR pha ; save registers
tya
pha
txa
pha
sta INTACK ; clear irq counter
-Anders.
Received on Thu Apr 15 15:07:07 1999
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