[sdiy] TR-7x7? (was Re: Proms)

[Colin f]

----- Original Message -----
From: "Drew Smith (mux)" <drew at riotnrrd.com>
To: <xyzzy at sysabend.org>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, September 26, 2002 2:27 AM
Subject: [sdiy] TR-7x7? (was Re: Proms)


> Something I've been wondering about for a while... I *love* the TR-707,
> but I'm simply not thrilled with the sounds!  I assume these are stored
> on a ROM somewhere.

They're stored on multiple ROMs, but they could be changed...

>  I bet it'd be pretty trivial to modify a TR-707
> with the ROM from a TR-727, to allow switching between the two
> soundsets... but where I'm curious is whether or not it'd be possible to
> burn one's own set of sounds onto an EPROM for use in this machine?

There is a slight internal difference between the 707 and 727 - I'd need to
check the service notes to remember what it is, but it may mean the sounds
aren't quite interchangeable.
I've just moved house, so I've not got he workshop set up yet, but I've got
a 727, and I'd quite like to be able to switch it between 727 and 707
sounds, so I may get round to extracting the ROMs from it sometime. .
Maybe we could do a swap...
I've also got an image of the firmware from the 727 (I think it's common to
both) waiting to be disassembled and analysed, but again, no time :-(

Colin f