Re: New CBM-II discoveries

From: Mia Magnusson <mia_at_plea.se>
Date: Wed, 27 Jun 2018 13:47:46 +0200
Message-ID: <20180627134746.000008d1@plea.se>
Den Wed, 27 Jun 2018 12:18:00 +0200 skrev Michał Pleban
<lists@michau.name>:
> smf wrote:
> 
> > No disk loaded software accesses it, yet.
> 
> But realistically, is there any actual need to write software that
> accesses it? For what purpose?

And if so, is there any need to write such software that only works
with 8255 or 6523, but not both?

Btw it would be a good idea to once and for all agreee on a way to read
a specific address in the firmware rom to determine if the card has a
6523 or an 8255. (This of course applies to the 8088 board. I see no
reason for making the Z80 board with a 6523 at all, thus there is no
reason for differentiation of any software.

Btw I assume the idea from Commodore were that the built in Kernal code
for talking with the 8088 card should work with the Z80 card too.

There might be a need for 6509 software to determine if it's a Z80 or
an 8088 card in the machine though. I wounder how or even if Commodore
ment that to work? Does the 6509 software start the coprocessor and
first talk to it via the 6526/6523 interface and get some ID thing from
the coprocessor to determine if the 6509 software fits the installed
card?

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Received on 2018-06-27 14:00:04

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