In article <4d6fgo$d1e@wn1.sci.kun.nl>, rhialto@mbfys.kun.nl (Olaf Seibert) writes:
|> First, please be aware that your email address is set wrong.
|>
|> In <4d18u2$99o@newdelph.cig.mot.com> Eric R. Eckert <eeckert@shelf> writes:
|> >Is anyone aware of information which would allow me to convert my PET 2001N-16 to a PET 2001N-32? I am trying to help out my kids classroom run their one-and-only program on their one-and-only PET.
|>
|> AFAIK, there have been lots of ram configs in various PET models. It
|> was typical that you could use various sizes of ram chips, but if you
|> chose a small size you would not have enough sockets (or spaces for
|> sockets) to max out the full 32K. If you were unlucky you had to throw
|> out all your current ram chips and replace them with bigger ones. Much
|> like the current situation with SIMMs, really. On top of that, some
|> boards were filled with the bigger ram chips but the space for the
|> required additional sockets was made unusable, requiring you to buy a
|> new machine to get more memory.
Actually it was common practice for commodore to punch holes in the board
so you couldn't upgrade it. At one time I upgraded one by piggy-backing
the new chips on top of the old ones. If I remember correctly only one pin
had to be bent straight as it was a select line. then I tied all of the
select pins together and jumped it to the correct place on the board.
I don't remember the details anymore but it can be done. Get a set of
chips like the ones in the machine and a data book.
