Re: //gs memory card questions

[Rubywand <rubywand@swbell.net>]

Jeff Billman writes ...
> 
> I have an Apple //gs ROM 3 and I would like to use an Apple brand memory
> expansion card in it.  The card has 256K on it and looks like it can be
> expanded to 1MB.
> 
> When I plug the card in I get a ProDOS error saying that I don't have
> enough memory to load the system.

     With just 256k on the Expansion Mem board, you really do not have much
memory.


 
> Can I use this card in my system or is it for ROM 0 and 1 systems only?

     It should work okay in any IIgs.


> There are two set of jumpers on the board, do they control the address
> where the card lives?
 ....


     The jumpers are for telling the card how much memory you have installed.
The standard Apple IIgs 1MB Memory Expansion Card can be usefully configured
for 256kB, 512kB, and 1MB.


     For 256kB, the top left 8 sockets (i.e. the left half of the top row)
should be filled. No jumpers should be placed on the pins near the lower right
end of the board.


XXXXXXXX--------
----------------
                         O O (no Jumpers)
                         0 0


     For 512kB, the entire top row of sockets should be filled. The bottom pair
of pins should be jumpered.

XXXXXXXXXXXXXXXX
----------------
                         O O
                         0-0 Jumper bottom pair


     For 1MB, all sockets should be filled. The top and bottom pairs of pins
should be jumpered.

XXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXX
                        O-O Jumper top and bottom pairs
                        O-O



     You may still be able to get the IIgs mem card upgrade to 1MB (24 256k x 1
41256 DRAM mem IC's) from Alltech (760-724-2404) for $24.00. Or, you may have
an old PC with the memory chips you need.




Rubywand