Re: GS-RAM III ROM Replacement?

["Henry S. Courbis" <apl2research(a.t.)comcast.net>]

Hello pitz.

>I recently acquired a GS-RAM III memory card that turned out to be non-
> working.  I tried swapping chips with another known working GS-RAM III
> card and isolated the problem to the chip labeled GSR3A.I, leftmost
> from the pictures at:
> http://www.downloads.reactivemicro.com/Public/Apple%20II%20Items/Hardware/GS-RAM_III/Pics/
> Is this a ROM chip for the memory card?  If so, is it easy to obtain a
> dump from my working GS-RAM III and program another ROM to be used as
> a replacement?

It's not actually a ROM, but a GAL.  It's a type of programmable logic chip.

The GAL is actually easily replaced.  They still produce new blanks that can 
be purchased for around $4 USD here in the States.  I just happen to have 
the JEDEC file (programming data file) if you need it.  It's also on the Web 
Server here: 
http://www.downloads.reactivemicro.com/Public/Apple%20II%20Items/ROM_and_JEDEC/GS-RAM%20III/. 
Of course you'll need either a Programmer that can program GALs or someone 
who has a Programmer that can program GALs.  You'll then also need the GAL 
which I believe is a GAL16V8.  Any speed will work.

I just happen to be able to sell you a GAL and program it for you too if 
needed.  You can order one online if needed from our Store.  Just order this 
item http://www.reactivemicro.com/product_info.php?products_id=59 and leave 
comments at check out that I should program the GAL for your GS-RAM III. 
Most orders ship the next day so you should have it within a week in most 
cases.

Hope that helps.

PS - Good find with the memory card too!


-- 
Henry S. Courbis
www.ReactiveMicro.com
Legacy Hardware and Support - Come take a look at what we have to offer!