Actually, I found that 4Mbit eproms aren't as expensive as SRAM
counterparts, mouser stocks 'em for like $6. 8Mbit are like $12....

They are 32-pin, original 707/727 are 28-pin. The extra address lines
are at the top of the chip (i think), so you could solder (or socket
is better) 28-pins of the 4/8-Mbit into the holes left by the previous
Eprom, and just run the extra 4-address lines (for 4Mbit) to a 4-bit
rotary encoder, or use just a extra SPDT (in addition to the rotary
encoder) for the 8Mbit. That would give you access to 16 or 32 banks
of sample memory..... so you could fill it with 505, 626, 707, 727,
909, LM-1, HR-16, Drumulator, DMX, Korg DDD-XX, you know....all the
classics...and still have room to create your own soundsets to boot.

I've modded my Casio Sk-5 sampler in this same way, so I know it's
definetley possible.....once we've figured out the interleaving exactly.

Food 4 thought

Ryan

So it wouldn't be too hard

--- In tr-707@yahoogroups.com , "plutoniq9" <Plutonique9@...> wrote:
>
> I just bought a USB eprom burner off the bay, so I'll be able to mess
> around with "attempting" burning new sample eprom's soon.....
>
> Too bad they aren't all jammed on one eprom, as that would make it ez
> to use a larger size, and add switchable banks (by toggle the extra
> address lines). I guess it makes it a little cool by them being
> seperate, cause then you could have different soundset combos.... i'd
> probably just do it to the interleaved ROMS (not crash & ride roms)...
>
> Only problem is that large eproms & parallel SRAMS are expensive,
> about 36 bucks a piece for battery backed 1mb SRAMS....but you could
> fit quite a few sample banks on 'em (ie. 32). I don't know if Eproms
> go up to that size
>
> I know someone though email communication that understands how to
> interleave samples on Eproms, i'll have to grab the visual basic
> program he uses.
>
> Ryan
>
> --- In tr-707@yahoogroups.com , "acousmatique" <acousmatique@> wrote:
> >
> > I was planning on ripping the sound SRAMs so that I could properly
> decode the data and
> > burn new sounds, but then I decided that it was too much hassle.
> Except for the crash and
> > ride cymbals, those are easy. I won't ever use the 707 sounds if I
> rip them. Since I have
> > wanted to make better clock controls I decided that the best thing
> to do is bypass the
> > whole "gate array" mess and simply reproduce the circuitry for the
> cymbals for every other
> > voice. This is a lot of new stuff, though - so I'll need to either
> re-case or squeeze
> > eerything onto a PCB. I am keen to try PCBs but I need a new printer
> first, as mine died.
> > Re-casing is a pain but cool since I can fit many other mods which I
> simply don't have
> > room for in there.
> >
> > This stuff is on hold with me until later in the spring. I am
> working a lame 3rd shift job
> > now and my garage workbench is frozen, so once it gets warmer out
> there I'll get started
> > again. I will desolder and rip all of the SRAMs sometime this year,
> but I've had to put it off.
> >
> > I miss my modding!
> >
>