| RE: [hatari-devel] add support for TT ram -> problem with HD emulation and DTA |
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- To: "hatari-devel@xxxxxxxxxxxxxxxxxxx" <hatari-devel@xxxxxxxxxxxxxxxxxxx>
- Subject: RE: [hatari-devel] add support for TT ram -> problem with HD emulation and DTA
- From: "Konador, Cyprian" <cyprian.konador@xxxxxx>
- Date: Wed, 17 Dec 2014 17:02:07 +0000
- Accept-language: pl-PL, en-US
- Thread-index: AQHQGfka56hVsGdSKka+myOkgDeBRpyTwE8AgAAD64CAACo7AIAAAs+AgAABugCAAAHPAIAABIqAgAAFWgCAAAHrMA==
- Thread-topic: [hatari-devel] add support for TT ram -> problem with HD emulation and DTA
> -----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