[Coco] Re: Q: Field Sync Interrupt

[Torsten Dittel]

> > What happens exactly, if you write to Bit 7 of $FF02? I know this Bit is
> > the Field Sync Interrupt Flag which (if interrupt enabled in the CC and
> > in Bit 0 of $FF03) is set when an interrupt occurs each 16.67ms and has
> > to be cleared by reading from address $FF02 within the Interrupt Service
> > Routine to allow further IRQs.

> First the Field Sync Interrupt Flag is bit 7 of $FF03 not $FF02 as you
> said. Did you mean "write to $FF03"?

Ah, yes, exactly, a typo (too less sleep last night...)
 
> If there is any effect by writing to bit 7 of $FF03, it would be
> transitory not lasting past whatever monitors the flag.

Thanks,
Torsten