RE: Who owns a 8050/8250 with tandon drives?

From: Hoffmann-Vetter, Martin <>
Date: Thu, 10 Apr 2014 17:28:37 +0200
Message-ID: <003501cf54d1$8b6d5510$1b09a8c0@mhvnb10>

> As far as I can determine, there was only one version of DOS 1,
> although Commodore's documentation referred to it variously as DOS
> 1.0 and 1.2.

I've read at the Book "Programming the PET/CBM" from Raeto West. The author
differ between DOS 1 (2040) and DOS 1.2 (3040). He also show the difference
about the digital main board. The 2040 board with DOS 1 is _not_
upgradeable. Only the newer 3040 board is upgradable from DOS 1.2 to 2.1.

The other point is, there exists a 901468-05. This must be an earlier
version of the 901468-07 (High ROM). And now you can combine what's about
the numbers -01 and -02 or -03 and -04.

Or if i remember correctly, there exists many early version of 2040 with so
many bugs, that there are not usable. Are this the version -01/-02
or -03/-04?

> The power up message on the drive says only DOS, and does not give a
> number.

That's the problem. Starting with DOS 2.5 the correct DOS version is

What's about the DOS 2.0 for 4040? There exists two version. Is the
revisited version the DOS 2.1?

Did anyone own the commodore tech topics from 1979? This must be the year
with the info we needed ...


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Received on 2014-04-10 16:00:07

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