Circuit Overview:
Building off the ESQ1, a later 'hybrid' synth using ROM based sound information and analog filters.Here is a clip from SDIY:
---On Mon, 1 Oct 2007, John Mahoney wrote:
>> I can hardly believe they were generating software envelopes at 50-60Hz.
Within the Ensoniq ESQ1/SQ80 (1985/87, 68B09 running at 2MHz for
anything than sound chip access) it's something along 83Hz update rate.
Not timer-controlled, btw., but through some more or less carefully
timed cooperative multitasking (which makes adding MIDI-clock sync
pretty much impossible w/o rewriting the entire task/subtask handler
routine).
Rainer
Service Tips:
I've only done peripheral things; key cleaning I recall it seems. If anyone is aware of common service issues let me know.