Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!mit-eddie!genrad!decvax!ucbvax!cbatt!ihnp4!ihlpg!cuda 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