Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!lll-lcc!well!maryr From: maryr@well.UUCP (Mary C Rinaldi) Newsgroups: comp.sys.cbm Subject: Re: C-64 A/D conversion Message-ID: <2333@well.UUCP> Date: Sat, 10-Jan-87 17:50:58 EST Article-I.D.: well.2333 Posted: Sat Jan 10 17:50:58 1987 Date-Received: Sat, 10-Jan-87 23:43:32 EST References: <2668@ihlpg.UUCP> Reply-To: maryr@well.UUCP (Mary C Rinaldi) Organization: Whole Earth Lectronic Link, Sausalito CA Lines: 25 In article <2668@ihlpg.UUCP> cuda@ihlpg.UUCP (Nelson) writes: >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 I've began experimenting with the joystick ports on my C64. I just bought some paddles to tear apart to look at. I also bought a 500k ohm pentiometer which is almost the same as the one in the paddles(470k ohm) Ill post here as soon as i figure it out, i want to hook up a thermistor and a phototransistor to it and use it in a lab.