Re: IIgs RAM Card Identification

["Bill Garber" <willy46pa@comcast.net>]

"Polymorph" <polymorph69@hotmail.com> wrote in message
1158046203.546409.275800@e3g2000cwe.googlegroups.com">news:1158046203.546409.275800@e3g2000cwe.googlegroups.com...
:
: Bill Garber wrote:
: > This should be exactly like the Apple card.
: > With Bank 1 filled, 8 - 41256 (256kx1) ram
: > chips, and no jumpers installed, you should
: > get 256K. With banks 1 and 2 filled, you need
: > jumper 1 installed to get 512K. With Banks
: > 1, 2, and 3 filled, jumper 1 on, jumper 2
: > off, you get 768K and with all of the Banks
: > filled, both jumpers on, you get the full 1 MB.
: > Fill the card, then experiment with the jumpers.
: > You can't hurt it. All they do it change the
: > state of CROW0 (jumper 1), and CROW1 (Jumper 2).
:
: Bill thats what I thought too, but it doesn't
: appear to work that way. And I have done fairly
: extensive testing (see my previous posts in this
: thread). In fact I thought I had covered just
: about all of my bases with the 768K RAM I have
: available to me to test. Although I haven't tried
: Ed's suggestion of the banks being vertically
: aligned (never occured to me).
:
: Thanks for the input though...  :-)
:
: cheers,
: -p


My suggestion implies to fill the card first,
then try the jumpers and see what you get, not
to mess with how the banks are filled. There
may be a problem with the card. Also, which
ROM version IIgs are you trying this card in.
I've discovered that GS-RAM (1.5 MB) doesn't
work in a ROM03 IIgs, and this card which uses
an odd logic scheme as well may not work in the
ROM03 either.

Bill Garber
Owner - Garberstreet Enterprizez
Co-owner - GSE-Reactive.com
(610)935-7676 (610)329-8996