not really anything substantive on AH.

another thing i thought of is swapping the cymbal roms with one of
the other ones. i don't know if this would be interesting scrambled
up garbage or just various shorter versions of the cymbals. i'll
definitely try it when i get further into the rom switching project.


--- In tr-707@yahoogroups.com , "foleymachine" <foleymachine@y...>
wrote:

> bizz,
> yeah, that sounds super good! i don't know anything about eproms

but

> i definitely want to research it and see what i can find. i think
> i've seen it mentioned on AH, i'll check the archives.
> greg
>
>
> --- In tr-707@yahoogroups.com , "bisaillon3" <bisaillon3@y...> wrote:
> > hey greg!!!
> > Thats is good idea!!! U have to send me some pick of
> your
> > bend. For the m64-c cartridge i got some news... Roland will send
> me
> > the schematic of the cartridge. So we can figured out to upgrade
> > this thing!!! It will be post shortly may be in the middle of

this

> > week.
> >
> > For your upgrade of the chip 707/727 thats a pretty good idea and
> > pretty simple to do. I think of that, and why we not burning a

new

> > sound on the rom Imagine!!! I look at some epprom burner to do
> this
> > but im not a expert in that. the only thing we have to figure is

to

> > find a epprom like the 707(8 bit)i think! That will be heaven! If
> we
> > can create a box with a serial printer connector and change each
> > time u want the sound of 707!!!
> >
> > So any expert in rom The part number of the ic is HN51256pc71.
> >
> > regards
> > bizz
> >
> >
> >
> > --- In tr-707@yahoogroups.com , gregory zifcak <foleymachine@y...>
> > wrote:
> > > my first message came back to me after all. here it
> > > is:
> > >
> > > thanks for starting this group, the 707 is the center
> > > of my
> > > operation. i will post info and instructions about
> > > mods as i do them.
> > >
> > > as for the mc64, cool idea. i can't help you out
> > > though, in fact i
> > > tore the whole slot out of mine to make room for some
> > > big switches to
> > > switch between the sounds of the 707 and 727. i'm
> > > planning to use
> > > switches from those big printer switcher boxes that
> > > switch between
> > > serial ports that have 25 pins. the voice roms for the
> > > 707/27 have 28
> > > pins. my plan is to put sockets where the voice roms
> > > are, then put
> > > the voice roms on a separate circuit board (with
> > > sockets), hook up +
> > > and gnd and pin 22 (called chip select) to the
> > > positions on the
> > > original board, then hook the remaining 25 pins to the
> > > 25 wires
> > > coming from one of the positions of the switch, and
> > > the two voice
> > > roms on the new board to the other 2 positions. i'm
> > > thinking maybe
> > > the easiest way to do the hookup is to find the right
> > > size ribbon to
> > > go between the sockets and the new board with the roms
> > > and switches.
> > > any opinions i'll definitely post my findings.
> > >
> > > other ideas:
> > > 1. since i have the decay mods and vca inputs, i'm
> > > thinking of also
> > > adding some kind of cv input or internal oscillator
> > > for amplitude
> > > modulation of the cymbal/hh/external sounds.
> > >
> > > 2. 808 oscillators. the 808 hihat, cymbal, and cowbell
> > > sounds are
> > > generated by a hex schmitt trigger chip that is wired
> > > as 6 squarewave
> > > oscillators, which are mixed with resistors and then
> > > filtered. my
> > > idea is to at least build the oscillator section (chip
> > > and a few
> > > resistors and capacitors) and see how it sounds, then
> > > maybe some
> > > simple bandpass filters with frequency knobs. then
> > > i'll plug them
> > > into my vca inputs so i've got 808hh/707hh,
> > > 808cy/707ride, and
> > > 808cowbell/707crash! the cool thing too is that you
> > > can tune the
> > > pitch of the oscillators by varying the power with a
> > > pot (5v max!). i
> > > don't know if this has any relevance for anyone
> > > because you need the
> > > decay/vca mod for this to be useful, but if you
> > > haven't done it i
> > > highly recommend it. i'll upload plutonique9's
> > > instructions from
> > > Analogue Heaven, as well as the 808 schematics. the
> > > modern day
> > > equivalent of the chip in the 808 is call 74hc14 hex
> > > schmitt trigger.
> > >
> > > 3. multiple trigger outs. this one i haven't quite
> > > figured out. i
> > > currently use the rimshot trigger to sequence an
> > > analog bass drum. i
> > > have a few other devices and 4 or 5 more trigger outs
> > > would be
> > > extremely useful! i have found the internal triggers
> > > in the 707, but
> > > they seem really low amplitude and maybe even negative
> > > going. i
> > > imagine this sort of thing can be done with a
> > > comparator otherwise,
> > > i'm going to try with a 555 configured as a fast
> > > one-shot. again,
> > > i'll post info when i try it out.
> > >
> > > greg
> > >
> > >
> > > __________________________________
> > > Do you Yahoo!
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> > > http://taxes.yahoo.com/filing.html