Re: chips

[Rubywand <rubywand@swbell.net>]

Adalbert Goertz writes ...
> 
> I have an Apple memory expansion card populated with
> 8x256k chips which are located at
> columns 4,8,12,16.
> 
> I also have a RAMWorksII expansion card for the iie populated
> with 16 256k chips which are located at
> 
> x x
> x x
> x x x
> x x x
> x x x
> x x x
> 
> I like to transfer 256k memory from the RAMWorksII card to my
> Apple card.
> I dont have any documentation for the cards.
> Which chips should I remove from the RAMWorksII card and place them
> in which columns on the Apple card?
> Can the Apple card be populatetd with 768k?
> (I thought I read somewhere that the Apple card works with 256k, 512k or
> 1024k only, not with 768k).

     The standard Apple IIgs 1MB Memory Expansion card can be usefully 
configured for just 256k, 512k, and 1MB.


     For 256k, 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 512k, 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 
   

     If the idea is to leave 256k of working RAM on the RAMWorks card, I 
do not know which 8 chips to pull or which, if any, settings to change.

     An alternative is to order a set of 24 41256 mem IC's for the full 
IIgs mem card upgrade to 1MB from Alltech (619-724-2404). The price 
(December, 1996) for the set is shown as $24.00.    


Rubywand