Re: Please Help with GS Memory!!!

[dempson@actrix.gen.nz (David Empson)]

David Sanborn <dsanborn@clarityconnect.com> wrote:

> Hi,
> 
>  I just purchased two GS systems: one a Rom 1 and the other a Rom 3.
> I discovered that the Rom 1 system contains a GS Juice Plus memory card
> (from Applied Ingenuity) that can hold up to 4 megs of memory.

That is precisely the card I have in my ROM 3.  (My ROM 1 has my old
OctoRAM card.)

> One bank of 8 chips is already filled (for a total of 1 meg of memory on
> the card) and I would like to fill the others. Additionally, I'd like to
> transfer the card from the Rom 1 system to the Rom 3 system.
>  What I'd like to know is this: what kind of chips do I want to use
> in order to populate the rest of the card?

The card uses standard 1Mx1 dynamic RAM chips, 120 ns or faster,
supporting CAS before RAS refresh (most do).  They must be installed in
blocks of eight.  The supported configurations are 1MB, 2MB and 4MB.

I can't give you part numbers offhand, as they vary widely between
manufacturers.  Hitachi called it the HM511000, with various suffixes.

 The part number 
 The chips that are already on
> it have 18 pins each, and a large, lowercase 'i' printed on them, with
> the following information: 
> [...] 'P21010-10 940 Korea'. Will these chips work in a Rom 3 system?

Yes.  There is no difference between the requirements of ROM 3 and ROM 1
as far as the type of RAM is concerned.  The only issue is how the card
decodes addresses.  If it uses the documented method (row selects,
limited to 4MB total), it will work in both motherboards.  If it uses a
nonstandard method, then it might not work properly in one of the
motherboards.

> Any idea where I could buy some chips that would work?

Sorry, can't help there.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand