I understand that you all have used pins on other chips to power and
ground the 555 oscillators, but what are you using to ground the 555
outputs That is, if the 555 output is hooked right into a clock pin,
where is the ground associated with that ouput placed


BTW, IC10 appears to be there for cartridge use only, no luck with
replacing that chip. I traced the schematics and it looks like I may
fried IC32, "voice select," so that's the next attempt. I will repair
this 707, damnit, it will happen.

--- In tr-707@yahoogroups.com , "philo_707" <philo_707@...> wrote:
>
>
> Thanks for the response. I think you're right on both points. BTW,
> this isn't a voice chip, it's actually a data buffer that Roland
> sourced from Toshiba. I ordered the chip yesterday, if I get good
> results I'll definitely post. It's IC10, which from the schematics
> looks to interface the memory cartridges with the CPU, but
> apparently the trigger data (or something with that effect) from the
> internal memory is routed through there too. Shorting pins 2 and 3
> will trigger sounds, but don't do it because I'm about 90% sure
> that's what fried the chip. I could be wrong, maybe some random
> chip downstream is fried, but I have a good feeling about this.
> Anyway, if you ever do a 707, stay the hell away from IC10, and I'd
> stay away from 8 and 9, too. For that matter, I'm sticking to the
> voice chips and the env generators from now on.
>
>
>
>
> --- In tr-707@yahoogroups.com , "kingconga42" <kingconga8@> wrote:
> >
> > --- In tr-707@yahoogroups.com , "philo_707" <philo_707@> wrote:
> > > can I
> > > put in a chip from a different manufacturer so long as they have
> the
> > > same part number
> >
> > i would guess.. yes. but- if it's a voice chip, won't you need to
> burn the right
> > data onto it
> >
> >
> > > Also, for bit scrambling, is it safe to connect pins of the ROM
> chip
> > > to different ROM chips,
> >
> > i've done the bit scrambling with a tr-505 and an alesis hr-16.
> I'd say as long
> > as you stay away from the 5V+ pin, you'll be ok. Heck, i'd even go
> so far as to
> > say you can connect different chips in DIFFERENT MACHINES, but i
> haven't
> > tested that yet.
> >
> > -justin
> > = burnkit2600.com =
> >
>