From: Frank Vanaman [mailto:fvanaman@...
Sent: Sunday, October 31, 1999 5:23 AM
Subject: Re: [AH] JP-4/Promars mem upgrade
My JP-4 has a similar mod (done by someone else), tho' mine was not a x2
mod but a x5 mod, namely 4 more memory chips are added in parallel for a
total of 40 user programmable slots instead of 8.
There's not much to it-- a piece of perf-board with 5 sockets on it (one
for the original mem. chip, 4 for the added ones), one socket having
long legs (e.g. wire-wrap) which can be plugged into the original single
socket. The remaining 4 sockets are wired in parallel to the fifth, and
a multi-position selector switch is used to select which chip is
It works like a champ, although mine is off line at the moment because I
need to replace the Ni-Cd battery which sustains the memory.
> I found an old issue of EM with a memory mod for the JP-4/Promars, it
> the number of user patches. Has anyone ever preformed this mod? Is it
> worth doing?