[COFF] Microware's OS-9 (was: [TUHS] Clever code)
G. Branden Robinson
g.branden.robinson at gmail.com
Sat Jan 7 02:38:40 AEST 2023
At 2022-12-14T10:39:59-0500, Brad Spencer wrote:
> "G. Branden Robinson" <g.branden.robinson at gmail.com> writes:
> The source to OS-9/6809 would have been released by Microware a long
> time ago had it not been for a particular person in the user
> community. Got mucked up. I fell out of following it after the BSD
> Unixs became available.
They guy's name wasn't Mark Siegel, was it?
(Feel free to reply privately.)
> Level II was nice. It was able to use bank switching and would allow
> a set of random 8k memory blocks out of the 128k or 512k present in
> the CC3 system to be mapped into the 6809 64k address space. The
> Color Computer didn't support memory protection, so no paging or any
> real process protection, but this banking allowed for a lot of
> possibilities. I know that there was other OS-9 systems around that
> ran Level II but I don't really know how they managed memory. I would
> suspect it to be simular to the CC3, but that is just a guess on my
> part.
I ask because I asked around elsewhere, and this guy got very hostile
very fast, and touted the GIME chip as performing "address translation"
as if it were a Motorola 68451 or something. (I'm not sure even _that_
does address translation in the sense we think of it today, but in any
case it was a more powerful, more complex and therefore expensive part
than Tandy was ever going to replicate or put in their Color Computers.)
Regards,
Branden
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