Pacific Educational Systems VPU-1 External Voice Synth

Michael B. Brutman mbbrutman-cctalk at
Sun Mar 6 17:33:00 CST 2011

This is an external voice synthesis box based on an Intel 8031 
micro-controller and a TSP5220CNL synthesis chip.  It has an RS232 
interface, volume and tone knobs, a headphone jack and an RCA jack for 
external audio.

Does anybody remember these things and how to talk to them?  I've tried 
all of the various bps rate and parity combinations from 300 to 19200 
and I can't get anything response (data or sound).


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