Re: Strange CBM710 with 3.5" drive

From: Christian Dirks <>
Date: Thu, 13 Jun 2013 21:58:26 +0200
Message-ID: <>
So it was you who bid me out ... ;)
I wanted to see how the internal floppy drive works.

'Elektronikladen Detmold' still exists:
Maybe someone there knows about the 'GDP 64K' ?


Am 13.06.2013 18:23, schrieb Michał Pleban:
> Hello!
> 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?
> Regards,
> Michau.
>         Message was sent through the cbm-hackers mailing list

Christian Dirks

       Message was sent through the cbm-hackers mailing list
Received on 2013-06-13 20:01:18

Archive generated by hypermail 2.2.0.