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1999-11-01 by Verschut, Ricardo
-----Original Message-----
From: GOrlandi@... [mailto:GOrlandi@...] Sent: Sunday, October 31, 1999 3:35 AM To: analogue@... 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?
1999-11-01 by Verschut, Ricardo
-----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 enabled. 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. Frank GOrlandi@... wrote: > > 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?
1999-11-01 by Verschut, Ricardo
-----Original Message-----
From: Tom Moravansky [mailto:tmoravan@...] Sent: Sunday, October 31, 1999 3:56 PM To: GOrlandi@... Cc: analogue@... Subject: Re: [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? I have the plans as well, but never felt the need to install the upgrade. The JP-4 is an early 'synth with memory' and as such has some limitations. You don't have much control over the sound after storing it. Slider and knob movements don't affect the stored/preset sound so I tend to use the JP-4 like a MiniMoog - front panel/manual mode only. I guess if you had some basic sounds you liked storing more of them would be OK. I have seen memory mods for everything from 2x to 4x the number of slots. -- ___________________________________________________________ Tom Moravansky tmoravan@...
1999-11-01 by Verschut, Ricardo
-----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? >