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

From: Martin Hoffmann-Vetter <>
Date: Mon, 7 Apr 2014 18:52:14 +0200
Message-ID: <002401cf5281$ba806830$>
Hello Olaf,
hello William,

> And debugging that is really helped by
> some knowledge of the contents of the FDC ROM...  chicken and egg.
> Add to that the lack of a hands-on situation, and that makes it rather
> difficult.

I've dumped the DOS1 RRIOT 901466-01 and 901466-02. Both are identically.
After William postet the DOS 2.7 Tandon RRIOT 901884-01 i've implemented
this into my universal DC source code. Thanks to William! It seems the
Tandon is near to the Matsushita drives.

You can look at a first beta version at The binaries are also included. This
is a conditional source code, so any known version (from twelve) can

The init and format code that is executed by the DC, but stored in the BC
ROM is included, too. The structure and comments from the format code is not
good. It's not easy to combine all format programs over all DOS version (and
formats) into one source code.


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Received on 2014-04-07 17:00:02

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