Path: utzoo!utgpu!water!watmath!clyde!att!rutgers!ucsd!sdics!carrier
From: carrier@sdics.ucsd.EDU (Mark Carrier)
Newsgroups: comp.sys.mac.programmer
Subject: Millisecond timing on Mac II
Summary: Can convenient millisecond timing be achieved?
Message-ID: <626@sdics.ucsd.EDU>
Date: 6 Sep 88 23:02:46 GMT
References: <1325UD040164@NDSUVM1> <13946@agate.BERKELEY.EDU>
Reply-To: carrier@sdics.UUCP (Mark Carrier)
Organization: U.C. San Diego, Institute for Cognitive Science
Lines: 20


I am trying to get accurate millisecond timing on a Mac II.  I 
want to record subject reaction times where the responses are
keypresses.  Installing a task via the Time Manager seems the
most promising approach, where the task simply increments a
global counter every millisecond.  The only problem is that 
there does not seem to be a convenient way of making the task
be executed every millisecond.  Calling the routine PrimeTime
from within the task itself to reschedule its execution does
not work (the Mac crashes).

Does anybody know a convenient (or any) way of doing this?  Is
it possible?  If not, is there some other (perhaps lower-level) 
way of achieving millisecond timing?

Any and all suggestions are appreciated.  This timing problem
seems solvable on the Mac II, someone must have already done
such timing for some application?!!

				Mark Carrier