| Re: [hatari-devel] add support for TT ram -> problem with HD emulation and DTA |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] add support for TT ram -> problem with HD emulation and DTA
- From: Uwe Seimet <Uwe.Seimet@xxxxxxxxx>
- Date: Wed, 17 Dec 2014 18:27:47 +0100
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Yes, there are no restrictions wrt TT-RAM for TT SCSI/DMA. Only ACSI/DMA is
restricted.
> > -----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.
>
>
> > By the way, if you have a TT, have you ever tested if all the memory
> > between 0x01000000 and 0xFEFFFFFF return a bus error, or is it just
> > between 0x01000000 and 0x7FFFFFFF ? As this is how TOS/EmuTOS check for
> > extra RAM, I wonder what would be the physical limit.
> >
> I'm going to do that tests with application posted by you http://www.atari-forum.com/viewtopic.php?f=51&t=27277&p=263672
>
>
>