[sdiy] PLL-controlled VCO

[Ray Wilson]

The Commodore 64 actually has a very cool synth chip in it that provides 
quite a bit of versatility. If you can find the old 1" thick Commodore 64 
manual it had the complete port mapping and control information. I wish I 
would have kept my C64 even as a piece of art. It was quite the computer for 
its day. But to stay on topic again I mention the VIC chip (I think it was 
called).

Ray

----- Original Message ----- 
From: "Andrew Wyld" <andrewwyld at hotmail.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, May 12, 2005 8:06 PM
Subject: [sdiy] PLL-controlled VCO


> Hi there,
>
> I am wondering if it is possible to use an arbitrarily weird VCO in a PLL.
> Basically I want to use a square wave from a computer (specifically a
> horribly cannibalized Commodore 64) to drive an analogue VCO, making a
> drift-free synth that can be sequenced and controlled completely from the
> computer console, but still sounds like an analogue synth.
>
> I'm figuring I can do this if I do some kind of horrible gating operation 
> on
> the VCO.  What would people suggest I read up on / look up on the net / 
> etc?
>
> Thanks!
>
> Andrew Wyld
>
> postmaster at ripe-fruit.co.uk
> http://www.ripe-fruit.co.uk/
>
> -- 
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.308 / Virus Database: 266.11.8 - Release Date: 10/05/2005
>
>