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Subject: FW: [AH] JP-4/Promars mem upgrade

From: "Verschut, Ricardo" <Ricardo_Verschut@...
Date: 1999-11-01

-----Original Message-----
From: Frank Vanaman [mailto:fvanaman@...]
Sent: Sunday, October 31, 1999 5:23 AM
To: analogue@...
Subject: Re: [AH] JP-4/Promars mem upgrade

Hi Y'all

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.


GOrlandi@... wrote:
> 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?