Re: Musings of tinkering hands...

From: Larry Anderson (
Date: 1999-08-07 05:11:55

William Levak wrote:
> On Thu, 5 Aug 1999, Bo Zimmerman wrote:
> >
> >       The Commodore SuperPET SP9000 -- Wow, there are not one, but TWO revisions
> > of the SP9000 expansion board.  The older is a double expansion board,

Double?  I think there are three... (plus that card mentioned later)  You
can't see all of of the boards, but my SuperPET picture is of that old version.

> In addition, there should be a small daughter board in a card edge
> connector towards the right rear of the top(memory) board.  The chips on
> the board should be facing towards the rear of the computer.  The Waterloo
> software will not load without this board.

All those boards stack up so high they had to cut a hole in the case (just
under the monitor lip) so that card could fit (at least on my SuperPET - which
is still non functional...)  Will have to check that board's orientation.

> The chips in sockets UD11 and UD12 could be anything.  Some PET software
> required a ROM in these sockets and the switches are a way of turning them
> on and off.  Also, when SuperPETs were shipped from the factory, they had
> ROMs in these sockets.  These ROMs had no function that I could find.  In
> fact, all the ROMs that I saw were actually obselete ROMs, apparently
> placed in the sockets for test purposes, and simply left there.  Look
> carefully at these ROMs.  You may have some rare version of an old ROM.

Next time I am at my storage unit I'll try to remmeber to take a look...

01000011 01001111 01001101 01001101 01001111 01000100 01001111 01010010 01000101
  Larry Anderson - Sysop of Silicon Realms BBS  (209) 754-1363  300-2400 baud
      Commodore 8-bit page at:
01000011 01001111 01001101 01010000 01010101 01010100 01000101 01010010 01010011
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