RE: C64 cluster

From: Richard Atkinson (
Date: 2007-11-07 09:23:34

A C64 cluster is an obvious thing to aspire to if you want to build a 
polyphonic synthesizer out of SID chips. At the moment the easiest way to 
do it is to buy one or more HardSID cards and run them in a PC with the 
HardSID MIDI software.

Some years ago some work was done on a simple C64 ring network using the 
CIA serial ports. It was found that pull-ups are required on the serial 
output lines, because the rise times of the CIA outputs with their internal 
passive pull-ups (depletion mode NMOS FETs no doubt) are not sufficiently 
quick to enable high speed operation.


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