| Re: [hatari-devel] IRQ for ncr5380 |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] IRQ for ncr5380
- From: Thomas Huth <th.huth@xxxxxxxxx>
- Date: Thu, 25 Apr 2019 20:35:47 +0200
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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.
Thomas