Re: 901885-04 (fwd)

From: Andre Fachat (
Date: 1999-06-15 14:26:38

William Levak wrote:
> My Micropolis 8250 has 901885-04 in it.  There were reports that there was
> going to be a DOS 3.0 for the 8250 (like the hard drives).  Maybe it is
> a prototype version of this, or something similar.  I don't see why this
> would require another processor.

It could be that the FDC processors memory space was exceeded. It´s
a 6504 with 8k only I think.
Otherwise I only know of add-on boards where the 6530 is replaced
by a 6532, with an EPROM for the 1k ROM missing in the 6532.

Es könnte sein, daß der Speicherbereich des FDC Prozessors voll
belegt ist. Das ist ein 6504 mit nur 8k Addressraum.
Ansonsten kenne ich nur noch das add-on board mit dem der 6530 
durch einen 6532 ersetzt ist, mit einem EPROM für den Speicher,
der im 6532 fehlt.


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Andre Fachat, Institute of physics, Technische Universität Chemnitz, FRG
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