Strange CBM710 with 3.5" drive

From: Michał Pleban <>
Date: Thu, 13 Jun 2013 18:23:45 +0200
Message-ID: <>

Today I picked up a strange CBM710 machine from eBay. Unfortunately it
does not power on, but here's what I found:

* There is a DIN5 socket at the back. It is wired to the User Port by
two wires. It's not an IEC port (different pinout, too little wires).

* There is an unknown adapter on the expansion port. It is wired to the
video connector so I assume it's some kind of graphic adapter. There is
an array of TTL glue logic there and one 40pin chip which has a big
radiator glued on - I cannot unglue it so I don't know what chip this
is. On the board are markings "GDP 64K" and "Elektronikladen 4930
Detmeld 18". There are many manually resoldered wires on the board, one
chip is even piggybacked on another.

And, the most strange of all...

* There is another board on the second expansion port, with an EPROM and
SAB2793B chip, and attached to it is... a 3.5" floppy drive!!! It is
mounted at the front, through a hole cut crudely through the front panel.

As I said, it does not power up so I cannot test anything, so I'd
appreciate any input on what these might be?


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Received on 2013-06-13 18:00:52

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