VIA chip and msec timer

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Article #17359

#17359

From: howard charles nusbaum
Date: Mon, 13 Jul 1987 17:10

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We are trying to use the Macintosh to collect responses from subjects
in psychology experiments.  We are interested in measuring the speed
of these responses with millisecond accuracy.  I know that there was
an article published in a journal that described using the VIA chip
timer 1 for this purpose, but it was to be called from BASIC and we
can't get it to work from C.  I have 2 questions:

1.  Where can we get a copy of Synertek's documentation for the 6522 
chip?

2.  Has anybody already written a C-callable (MPW C) msec accurate timer
routing?  If so, how can we get the code?

Thanks for your assistance.

Howard Nusbaum
5848 South University Ave.
The University of Chicago
Chicago, IL  60637

(312) 702-6468

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From: hcn1@sphinx.uchicago.edu (howard charles nusbaum)
Newsgroups: comp.sys.mac
Subject: VIA chip and msec timer
Message-ID: <2058@sphinx.uchicago.edu>
Date: Mon, 13-Jul-87 13:10:52 EDT
Article-I.D.: sphinx.2058
Posted: Mon Jul 13 13:10:52 1987
Date-Received: Tue, 14-Jul-87 05:48:12 EDT
Reply-To: hcn1@sphinx.UUCP (howard charles nusbaum)
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Organization: U Chicago Computation Center
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