Re: 9060/9090

From: Ethan Dicks <ethan.dicks_at_gmail.com>
Date: Tue, 24 Dec 2013 22:38:31 -0500
Message-ID: <CAALmimmOsgkkytjKnBPKqV9PxHMVK4psJ5ZqxEzUXDk5qwD-Bg@mail.gmail.com>
On Tue, Dec 24, 2013 at 4:55 PM, didier derny <didier@aida.org> wrote:
> Iím playing with sasi recently and Iím looking at the schematics of
> 9060/9090 (taken from commodore.ca)

Cool.

> Any idea of what really is the  component between the 6522 and  the 2716
> The number written is either 5810 (most probably) or  9810  it has 24 pins.
>
> Is it a 128 byte ram ?

Yes.  It's really a 6810 Motorola 128 byte SRAM.

> Apparently the most interesting software is In this 2716Ö

There are two sets of firmware in there (two CPUs).  One talks to the PET
via IEEE and understand CBM DOS commands, the other talks to the SASI
board, and they have a patch of SRAM for shared data.

> Any idea if a source code exist for this rom ?
> I would like to extract the sasi commend really send by this board

There may be some manual disassembly out there, but I do not think it's
as extensive as for the BASIC and KERNAL ROMs

-ethan

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Received on 2013-12-25 04:00:09

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