Archive of the former Yahoo!Groups mailing list: All about the Roland Jupiter-series

previous by date index next by date
previous in topic topic list  

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

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

-----Original Message-----
From: Eric S. Crawley [mailto:esc@...]
Sent: Monday, November 01, 1999 4:18 AM
To: analogue@...
Subject: Re: [AH] JP-4/Promars mem upgrade

Others have chimed in on this already but I'll add my quick $.02.

I modified my JP-4 back in 1980 by stacking two of the memory chips and
wiring the chip select to a switch on the front panel. I was gigging with
my brand new JP-4 at the time and the extra memories were ∗very∗ useful.
It's still going after 19 years and I have only had to replace the battery
once! Unrelated to this message, I actually came across 3 of the NEC RAM
chips used for this mod in my parts drawer. I could be persuaded to part
with them for not much more than shipping costs, if anyone is interested. I
don't know how common they are these days. They have been sitting in an
anti-static tube for 19 years so I can't guarantee that they work.

I would agree with the comment about the mod. Unless you are gigging with
the JP-4, it might not be worth the hassle. The JP-4 is fun and fast to
play with. I don't use many of the memories anymore either. However,
there was a really cool, heavily modulated sound that came out when I did
the mod. I think the RAMs powered up in a wild state. I don't know that I
could duplicate the sound on the front panel. Anyway, that sound stayed in
one of the memories...


>Date: Sat, 30 Oct 1999 22:35:15 EDT
>From: GOrlandi@...
>Subject: [AH] JP-4/Promars mem upgrade
>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 even

>worth doing?