Re: D9090 ROM images uploaded to

From: Ethan Dicks (
Date: 1999-10-04 17:24:02

--- Marko_Mäkelä <> wrote:
> On Sun, 3 Oct 1999, Ethan Dicks wrote:
> > I fired up my C= Colt (my ROM reader/burner)
> > and slurped CBM and PDP-11 ROMs this weekend.

> Even after converting them to PETSCII with tr, I didn't find anything
> either.  The files 300516revB.bin and 300517revB.bin are 8 kilobytes of
> $ff

Doh!  I'll grab another disk drive and check it.  Perhaps these have
evaporated over time (the larger images were from a pair of TI 2564
chips) or perhaps my ROM programmer didn't like them.

> ...but 300515revA.bin seems to make sense (it begins with valid 6502 code).

That's good.

I'll check another set of ROMs and see if those read any better.  I will also
verify that what I upload contains *real data* this time.  ;-)

My goal with this is to locate the disk geometry tables and see about patching
them to accept an ST-225 or similar more modern mechanism.  I know that moving
the J13/J14 jumpers selects D9060 vs D9090 functionality, so it's got to be
in the code somewhere to read those bits (I got a drive cheap ten years ago
because the previous owner couldn't make it format - it was a TM602S inside
with the jumpers set to expect a TM603S).


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