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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.