Simple sample playback using EPROMs

[Fraser, Colin J]

> -----Original Message-----
> From: Budweiser [FTS] [mailto:budweiser at ozemail.com.au]
> Sent: 09 January 1999 15:14
> To: Quint; Sean Costello; synth-diy at mailhost.bpa.nl
> Subject: Simple sample playback using EPROMs
> 
> 
> I was think about making a simple sample play back module that used
> EPROMs, specifically for storing a 909 hihat and cymbol 
> samples, complete
> with the pitch control like the 909. I take it decay can be 
> easily made
> using
> VCAs on the outputs together with an EG....
> 
> Does anyone have schematics on the web somewhere?
> Obviously i'm going to need some sort of microcontroller,and i
> assume this sort of technology has been used in all kinds of
> machines over the years like the drumtracks, 707 909 etc..

It's not so complicated to need a microcontroller.
I have built all the 909 sound generator circuits myself, and have a put a
bit of info about the sample playback sounds on my extremely minimal web
site at http://www.octavo.demon.co.uk/colinf/home.htm including wav files of
the sounds generated from the original 909 rom data.

I will be adding more to this page soon, so I will scan in the 909 cymbal
schematics if I can't find them somewhere else.
Also to come will be very simple tune mods for the 909 bass drum and hihats.

Colin f