Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ucbvax!husc6!wjh12!duc
From: duc@wjh12.UUCP
Newsgroups: comp.sys.mac
Subject: EXACT screen refresh rate, and other items
Message-ID: <71@wjh12.HARVARD.EDU>
Date: Thu, 28-May-87 18:06:08 EDT
Article-I.D.: wjh12.71
Posted: Thu May 28 18:06:08 1987
Date-Received: Sat, 30-May-87 04:58:08 EDT
Reply-To: duc@wjh12.UUCP (Dan Costin)
Organization: Harvard University, Cambridge MA
Lines: 15


Everywhere in Inside Mac I see that the Mac redraws the screen every
60th of a second (60 Hz).  Now I read in an article describing
PsychLib from Rice University that the screen refresh rate is 60.15Hz.
Does anyone know where this figure come from?  Are they wrong?

Is there an authoritative source of information on Mac hardware, to tell
you things like how long it takes for a keystroke to be read (using GetKeys,
not GetNextEvent), how come Button() looks for posted mouse events, and
not look at the low memory global (MBState) (does it??  does MBState
only get updated every 60th of a second? In sum, how come Button() only
returns a TRUE at tick boundaries? )  I'm interested in answers in the
millisecond range.

-dan costin