| Re: [hatari-devel] add support for TT ram -> problem with HD emulation and DTA |
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On 17 Dec 2014 at 17:02, Konador, Cyprian wrote:
> > -----Original Message-----
> > From: Nicolas Pomarède
> > Sent: 17 December 2014 17:49
> > To: hatari-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [hatari-devel] add support for TT ram -> problem with HD
> emulation and DTA
> >
> > I thought I read the TT had a 32 bit DMA for the ACSI part, but FDC and
> > audio used 2 24 bits DMA ? But maybe I'm mixing with sthg else.
>
> TT has the second DMA controller dedicated to SCSI (in opposite to Falcon,
> where SCSI is managed by ACSI DMA).
> And according to ProfiBuch, that dedicated controller has full 32bit address
> pointer ($FFFF8701/3/5/7) and it can address TT-Ram.
>
Yes, ExtenDOS does SCSI DMA into TT-RAM without any problems. ACSI DMA into
TT-RAM does not work however, so ExtenDOS uses the FRB in this case.
Roger