[sdiy] ROM duplication & MT-32

[Theo]

Hi Greg,
Yes please sent me the instructions.

One remark, it is not necessary to remove the roms.
Just cut the /CS pins and connect to +5v.
Next piggyback the roms.
But make sure the /CS pins on the new roms don't contact those of the old
roms
and connect the new /CS to the pcb with a short piece of wire.

Cheers,
Theo

------------------
----- Original Message -----
From: Greg Montalbano <Greg.Montalbano at ucop.edu>
To: <synth-diy at node12b53.a2000.nl>
Sent: Tuesday, March 13, 2001 5:47 PM
Subject: [sdiy] ROM duplication & MT-32


> Finally ready with the Roland MT-32 modification.
> This mod allows the installation of a backup battery (to maintain
> new sounds & settings when the unit is powered down), and a replacement of
> the factory ROMS, without which the battery backup would not work (due to
> the factory initialization routine),  and which allows you to store
> entirely new timbres in ROM.
>
> Thanks to the lovely & talented Jim Patchell, a data dump of the two ROMs
> is available at:  http://www.silcom.com/~patchell/mt32/mt32.html
>
> I've also boiled down the instructions to about 59K worth of text & GIF
> files, which I will be happy to email to anyone who wants to attempt this
mod.
> BE WARNED that not all MT-32s are alike;  there were apparently several
> board types, some of which had the ROMs soldered in (mine were in
sockets),
> which will require you cutting the old ones out and installing new sockets
> (it's do-able, but not for the impatient or faint-of-heart).  The mod also
> involves cutting certain traces on the board & soldering jumpers to new
> locations -- again, it can be done, but perhaps not a "novice level"
> project.