tr-909 schem's

[Trevor Page]

The little squares and triangles do indeed indicate which lines are
connected :-) they are simply there to make things easier for you.

The EPROMs do contain the data for crash, ride, hihats etc. Colin Fraser has
the data for these EPROMs on his website.

Are you going about building a 909 clone, out of interest? I started doing
that myself, and designed PCBs for it. I recently got my pcb's from a friend
who made them for me. Unfortunately one of them needs a little repair work
as some tracks are inclomplete.... bah....!

But with so many projects on the go, I might not have time. I might end up
selling them...

Trev


=========

Trevor Page BEng (Hons)
----- Original Message -----
From: Alan Podjursky <alan.p at clear.net.nz>
To: <synth-diy at node12b53.a2000.nl>
Sent: Saturday, October 28, 2000 10:43 AM
Subject: tr-909 schem's


> I printed the 909 voicing board out (taping the separate sections
> together....) and the long trigger lines and outs sometimes have filled or
> hollow shapes on them, like squares and triangles, like in (O 13-14) Do
> these indicate that other lines with similar markings are connected?
>
> Also, is the 4174 IC a 4040? What is the 4520? I figure that the
> HN61256P-C4x is the eproms containing the sample data for hihat, crash,
and
> ride. Is that right?
>
> Sorry if these look like pretty stupid questions, but if I don't ask I'll
> never know :-)
>
> -AlanP
>