[Coco] CDi Emulator

[Bob Devries]

I believe the Amiga A590/2091 SCSI card uses the WD33C93 chip.
--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Joel Ewy" <jcewy at swbell.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, April 22, 2008 1:30 PM
Subject: Re: [Coco] CDi Emulator


> Another thought on building an open source MM/1 / CD-i emulator is to
> start with MESS.  I'm sure Tim Lindner can give us more insight here,
> but I see that MESS emulates the Atari ST series.  It also emulates so
> much other diverse hardware, it makes me wonder if it doesn't already
> have code for any of the chips we would need:
>
> WD37C65 FDC
> Brooktree video DAC / Palette controller
> MC68901 MFP (1 on CPU board, 1 on I/O board) <-Atari ST has this chip
> MC68681 Serial (on I/O board)
> MC68230 PIT (on I/O board)
> WD33C93 SCSI (on I/O board)
> DS1287 RTC (on I/O board)
> AD7569 ADC/DAC (2x on I/O board)
>
> The fact that the Atari ST and Mac are emulated means that there is a
> 68000 CPU, which would only need slight modification to add the extra
> features of the 68070 that are actually used by the MM/1 or the TC-70,
> unless you insist on accurate instruction timing.  I think that the
> biggest job for anyone trying to implement an MM/1 / TC-70 / CD-i
> emulator would be to emulate the 66470 VSC.  It's well documented though.
>
> If you could find or write OS-9 drivers that would work with alternate
> hardware that is available in the the MESS codebase, you wouldn't really
> need to emulate all the same chips right away.  For instance, I can't
> think of any MM/1 software aside from the hard disk driver module itself
> that actually cares that the MM/1 uses the WD33C93 rather than some
> other chip.  If some other computer emulated in MESS has a different
> SCSI controller, and you can dig up an old OS-9 driver for it, you
> wouldn't have to implement the 33C93 right away.  It's really the 66470
> VSC that makes the MM/1 or the TC-70 or the CD-i.  Even so, any kind of
> emulated computer that runs OS-9/68K would be a big step in the
> direction of emulation of these three similar systems.  I'm not aware at
> the moment of any emulator that actually runs any 68000 version of
> OS-9.  Of course I'd love to be proven wrong.  I tried the Atari version
> of OS-9 on ARANYM, and probably also some MS-Windows-based emulators
> with no joy.  I don't remember trying MESS though...
>
> JCE
>
>
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