On Wed, 25 Aug 2021, Mark Cave-Ayland wrote:
>
> Unfortunately the datasheet I was using for reference doesn't appear to
> have the relevant detail here. Have you got a reference to the datasheet
> you're using which shows what happens to the timers at the zero crossing
> point?
>
The data
On 24/08/2021 11:09, Finn Thain wrote:
We rely on a QEMUTimer callback to set the interrupt flag, and this races
with counter register accesses, such that the guest might see the counter
reloaded but might not see the interrupt flagged.
According to the datasheet, a real 6522 device counts down
We rely on a QEMUTimer callback to set the interrupt flag, and this races
with counter register accesses, such that the guest might see the counter
reloaded but might not see the interrupt flagged.
According to the datasheet, a real 6522 device counts down to , then
raises the relevant IRQ. Af
