Re: D9060 with OpenCBM (was: Mac Installation with Brew)

From: Ethan Dicks <>
Date: Fri, 18 Aug 2017 15:00:26 -0400
Message-ID: <>
On Fri, Aug 18, 2017 at 4:02 AM, Anders Carlsson
<> wrote:
> Ethan Dicks wrote
>> it's probably possible to bump the number of tracks up to 254 by altering
>> the ROM code, but I don't recall if anyone has done that).
> On July 2, 2006 in a reply to me on this list, you mentioned that earlier on
> someone had tracked down the location of the drive geometry table and
> patched it in order to use around 16 MB from a ST-225. However I haven't
> found any such ROM files floating around.

I'm sure I was more sure 11 years ago.  Today, I couldn't tell you who that was.

> (The hunt for the golden drive geometry seems to have been going on since at
> least 1999)

Yep.  That's close to when I got my first unit.

> Also Markus Mehring once mentioned to the Secret Weapons of Commodore that
> in Germany there were upgraded drives meaning a 9060 could have anything
> from 2x5 MB to 2x16 MB capacity. I understand the SASI board accepts two
> drives (probably half height?) and interleaves them in directory listings.

The SASI controller does support two drives.  I don't know what ROM
mods it would take to make that work.  I'd love to see how that was

> Possibly all those tricks nowadays are mostly for curiosity, and even on the
> IEEE side there are more reliable and cost effective ways if storage
> capacity is what you are after.

So true.  For one, nobody wants a 16MB drive with one directory.  When
it was new, it was an interesting, if not outrageously priced device.
The DOS, though, is stale when it comes to not supporting things that
came later like subdirectories or mounting image files as a
filesystem.  That vastly helps using megabyte capacities.


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Received on 2017-08-18 19:03:30

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