OK I found it.

http://www.intersil.com/data/fn/fn3/fn3601/

Mike Harrington

The big problem remains. How do you program it by trial
and error without destroying a couple of engines?

Paul Lamar

Yep, getting a good read on what detonation "sounds" like is the big rub.
Got too many irons in the fire right now to do this myself.  If anyone wants
to tackle that job, I'll be happy to put an input on the EC2 which will
retard the ignition (programmable amount) when it goes active.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

When I was at Bruce's he explained to me the factory "method" was to rap the running engine with the hickory handle of a hammer.
...Chrissi

I just had an idea. (If ideas were a dime a dozen I would be rich.)
Use my cheap amplifier set up and record it on a cheap tape recorder.
Then feed it through a  spectrum analyzer program on the PC.
Anybody got a turbo street or race car engine where knock is a problem?
We could then program the knock chip from that data.

Paul Lamar 
 
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