[sdiy] JP8 EPROM upgrade (Was: Rack mounting Synergy -- best practice for rackmountingmods?)

[Greg James]

Colin,
Have you made this upgrade available to others? This sounds like a very
advantageous mod. Mine is a JP8A 14-bit late model.

-Greg James

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of colin f
Sent: Tuesday, June 26, 2012 4:20 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Rack mounting Synergy -- best practice for
rackmountingmods?

 
 
> That, and keep backup copies of the firmware EPROMs, etc.

Which reminds me of a useful tip that kills two birds with one stone...
A lot of old synths use NMOS EPROMs.
These can take a supply current over 0.1A when active.
There were four NMOS EPROMs in my Jupiter 8, which I replaced (with a bit of
harmless address decoding alteration) with a single CMOS 27C256
The temperature drop on the heatsink was obvious.
The PSU is likely to last longer, as well as the EPROM data.

Cheers,
Colin f


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