Re: [hatari-devel] ikbd overrun when using midi (Bad Mood for Falcon)

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On 12.11.2022 0.28, Nicolas Pomarède wrote:
> that's because MIDI IRQ is only changed when MIDI output is enabled and 
> some bytes are received/sent.
>
> Both ACIAs for IKBD and MIDI have their IRQ line connected to the same 
> GPIP4 pin on the MFP. This means that if any of the 2 ACIAs request an 
> IRQ, then IRQ should be set at the GPIP4 side.
> On the opposite, IRQ should be cleared on GPIP4 if both ACIAs have their 
> IRQ clear.
>
> There was a bug in Hatari : if one of the 2 ACIAs cleared its IRQ, then 
> it cleared the IRQ on GPIP4, instead of checking if IRQ was still set on 
> the other ACIA and keeping IRQ set on GPIP4 :(
>
> This would definitely create some problems when IKBD and MIDI bytes are 
> sent/received at the same time.
>
> This could be the reason for Bad Mood's loss of IKBD bytes, but also for 
> MidiMaze not working after a while.
>
> Eero, can you check if there's any improvement for these 2 cases ?

Thanks, BM seems to be working fine now!

I'll test MidiMaze later (could go to next week).


	- Eero