All about the Roland Jupiter-series

-----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...

	Eric

>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
doubles 
>the number of user patches.  Has anyone ever preformed this mod? Is it even

>worth doing?
>