Hi Gregory,

I've actually got a USB eprom burner comin' shortly that I bought off
the bay..... so if you want, I too could make the .bin dumps. We'd
still need the 707 & 727 sound eproms because if I was to make
multiple sound banks for the unit, i'd still like the original 707/727
sound ROM's to be a part of the 16 or 32 banks.

I've found the Linn LM-1, Linn-9000 and Oberheim DMX sound binaries
online too, so I'd like to incorporate them into such a mod. The rest
could be created simply by using samples, applying either mu-law or
a-law compression to them & changing the dropping the bit rate to
8-bit and whatever khz the sample rate is.

First thing is first, I'm gonna remove my 727 eproms & solder in
28-pin sockets & try just creating a single bank using the same 28-pin
eproms.....once i've got that down, then I'll work on creating a whole
bunch of banks for 'em.....the mod will be rather simple to
install..... cheap too.

If you interested in helping, you could try tracking down some
original .bin dumps from older 8-bit drum machines, I'm gonna rip the
eproms from my TR-626, I'd like to find TR-909 .bin's....

Seeya

Ryan

P.S send me an email if you want to throw the eproms my way, perhaps I
can figure out the interleaving by comparing various eproms.

--- In tr-707@yahoogroups.com , "gregory zifcak" <foleymachine@...> wrote:
>
> hot damn! multiple banks so does this mean you no longer need
> binaries from kingconga i'm lagging on getting him the chips.
>
> --- In tr-707@yahoogroups.com , "plutoniq9" <Plutonique9@> wrote:
> >
> > 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!
> > > >
> > >
> >
>