Re: IIGS Memory Expansion

[rubywand@swbell.net]

Dave Conroy wrote:
> 
> I just picked up a IIGS (ROM01) at a
> thrift store to add to my computer collection, and I'm
> in the process of combining it with other bits and
> pieces I have lying about to make it complete.
> 
> The memory expansion board has 1 bank of 256Kx1 DRAMS on
> it, 3 banks of sockets for additional DRAMS, and two
> jumpers labeled J1 and J2. Could someone who has
> a technical manual handy tell me ...
> 
> 1) will the board accept 1Mx1 DRAMS, or only 256Kx1 DRAMS
> 2) the population order for the sockets
> 3) the settings for the two jumpers
> 
> I've begun looking in used book stores for bits and
> pieces of IIGS documentation; even though some of the books are
> still in print, my computer collection has a rule that
> it is (generally) forbidden to pay more than the price of
> a computer for it's manuals.
> 

     If the Docs < ComputerPrice rule is enforced you could be in for 
a long quest getting anything like reasonably complete GS 
documentation. A copy of the 'Hardware Reference is, today, a bargain 
at the original price. The same goes for the 'Firmware Reference. You 
may want to zip back to that used book store.

     The Apple IIgs Memory Expansion Card is designed for 256k DRAMS. 
There is no jumper setting which permits using 1MB DRAMS.

     Here are the jumper settings and population order for expansion 
beyond 256k:

512K   jumper lower pins only / fill in top row
1MB    jumper lower and upper pins / fill in top and bottom rows.


Rubywand