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From: cuda@ihlpg.UUCP (Nelson)
Newsgroups: comp.sys.cbm
Subject: C-64 A/D conversion
Message-ID: <2668@ihlpg.UUCP>
Date: Tue, 23-Dec-86 09:43:35 EST
Article-I.D.: ihlpg.2668
Posted: Tue Dec 23 09:43:35 1986
Date-Received: Tue, 23-Dec-86 22:48:01 EST
Organization: AT&T Bell Labs, Naperville, IL
Lines: 13

Does anyone know how the SID chip does the A/D conversion?  Since
you have to use a specific maximum time constant, and changing the 
value of the pot effects the time constant it would seem that some 
type of timing is done and not a true A/D (voltage) measurement.  
Have any of you tried using a fixed RC ratio and varying the voltage?
I would like to use the pot pins for voltage measurement but don't
know how to fake the system out. 

Thanks for all the help.

Mike Nelson
ihlpg!cuda
AT&T Bell Labs