From triquet@supelec.fr (Benoit Triquet)
Newsgroups: comp.sys.hp48
Subject: HP48S with 288ko ram
Date: 5 May 1995 07:32:25 GMT

Hi all hp48 hackers !

Using the post by Thomas Otten and the file by Thijs Kasper (which includes
the post by Thomas Otten), I've been able to add 256 ko as ram cards in
ports 1 and 2 of my hp48S.
So I can say that as Thomas guessed, you can build TWO ram cards, and as
Thijs thought, this works very well on a 48S and not only on G's. I haven't
used Thijs'pcb, and soldered 33 little wires on the motherboard. It's hard
but it works !!!
Also I've added the dip's for read only protection, and I glued them under
the rubber foot located at the right of the batteries cover (I've drilled a
hole so I can access them removing the rubber foot).

As we say in France, voila ! Hope this will help 48S owners upgrading their
good old calculator ;-)
BTW the entire upgrade costed me 230 FF, around $45. And 4 hours of work.

A+
Benoit Triquet
triquet_ben@lsi.supelec.fr

[Rem by DOEGOX: in a 48G, you MUST change the 32k main RAM into a 128k one.
In a 48S, you CAN'T!!!]


