Re: [hatari-devel] IRQ for ncr5380

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 25/04/2019 à 20:35, Thomas Huth a écrit :
> On 25/04/2019 18.14, Nicolas Pomarède wrote:
> > Hi
> >
> > while looking at the code for ncr5380, I see that when IRQ is set it
> > calls "FDC_SetIRQ(FDC_IRQ_SOURCE_HDC)" which is connected to the same
> > FDC IRQ pin on the MFP.
> >
> > But on the TT's schematic, the NCR5380's IRQ pin is connected to the 2nd
> > MFP on GPIP's bit 7.
> >
> > Thomas, is this a temporary hack to use FDC int on the main MFP to make
> > ncr5380 work until the TT MFP is available ?
>
> The FDC_* functions should only be called in Falcon mode. Falcon does
> not have the second MFP, so the NCR5380 is wired differently here - it
> uses the same IRQ as ACSI on the normal STs.

By the way, looking at the falcon's schematic, I don't see where all the 
FD/HD IRQ signals are coming from ? (the usual pdf doc is of rather bad 
quality)

MFP IO5 is connected to IDEIRQ and XDISKINT (page 2). But I don't see 
IDEIRQ (I thought it would be on combel) and XDISKINT ?
Then on DMA chip U36, I see HDINT, FDINT and XDISKINT. FDINT is coming 
from the ajax floppy controller, but where are HDINT and XDISKINT ?
Does combel combine HDINT and FDINT as input to create XDISKINT as output ?

Nicolas