Re: PET Shugart interface?

From: Richard Atkinson (
Date: 2000-04-15 15:44:44

On Fri, 14 Apr 2000, William Levak wrote:

> This is a rather rare version of the PET.  Actually, it should say CBM
> professional computer on the front and should be referred to as a CBM.

On the left it says 'C= commodore', in the middle it says 'professional
computer' and on the right it says '3032 Series'. It has neither the 'PET'
nor 'CBM' initials I have seen on other pre-VIC machines. The chips inside
have date codes from 1979, making it my earliest Commodore machine by a
long way.

> This may have an interface connected to the expansion connector on the
> right side of the circuit board, or the interface may be in the drive
> unit.  Normally, the only circuit board inside this machine, is the main
> system board.  The only way to be sure is to open it and see what the
> cable is connected to.

Inside there is a PCB about half the size of the main system board, which
plugs into the IDC connectors on the right of the board and also has a few
smaller connectors running from it. One that caught my eye in particular
was a 10 way IDC connector on the floppy board, which connects to one of
the empty ROM sockets on the main board. The only identifying marks on the
floppy board are the following: 'DD DSK CTL P2' and 'ASSY 1000176', and on
the solder side 'COMPUTHINK' and 'FAB 5000120-000'. Curiously, there is a
daughterboard on the floppy board itself, which contains 2 2716 EPROMs and
some glue circuitry. It is mounted vertically in an edge connector slot on
the floppy board.

I wish I had a digital camera!


This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail

Archive generated by hypermail 2.1.1.