[RE: VCDO]

[Chris Crosskey]

re: VCDO...

>
>I do seem to recollect that Chris Crosskey (chris.crosskey at metrics.co.uk)
>was intending to collect EPROM data for this module (amongst others) - you
>might want to see if he still has it.
>

Yeah, there's plenty of copies ogf the VCDO in the EPROM archive 
:-))...Paul did an alternative PCB of the original circuit that had a 
seven-segment readouts for the table and wave read out too.....I know Paul 
has goen through any number of revisions of the HS-VCO, mostly cos he 
wanted a really fast one to drive his massively revamped  VCDO that used 
the PPG Wave data (needs a 64x clock not a 16x clock) and his universal 
EPROM sample playback unit too....he's really into his 8-bit hybrid stuff, 
he's got circuits that play back  most any drum sample on EPROM, but hwe 
wants to change the 555 clocks for 1V/Oct VCO's so as to use them to play 
back other things too.....

Personally I think that you can use the ASM-1 to drive the VCDO cos it only 
needs a 16x clock (4 octaves up) and the sounds are at their best in the 
lower mid......don't get tempted to change the 741 on the output for a 
TL071 or anything else that's any good as an op-amp, it does quite a good 
job of stopping clock-breakthough cos it's too slow to see it...:-)) 
Honestly....we spent some time feeding it every op-amp in the box once, and 
it sounds really harsh if you put a fast op-amp in there....(cue sounds of 
the purists on the list retching in the corner)....

chrisc