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From: tarr@cs.yale.edu
Newsgroups: comp.sys.mac.programmer
Subject: Re: Animation
Message-ID: <29222@cs.yale.edu>
Date: 4 Mar 91 21:50:16 GMT
References: <12151@goofy.Apple.COM> <16145@reed.UUCP> <91058.111052CXT105@psuvm.psu.edu> <16178@reed.UUCP>
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There really seem to be three cases concerning installing VBL tasks:

1. small macs (plus, SE, SE/30, classic)
2. slotted macs (II, IIx, IIcx, IIfx)
3. on board video (IIci, LC, IIsi)

I think I have categories 1 and 2 down pat. Just check machine type and then
use VInstall or SlotVInstall, but on the cat 3 machines, I try to use a
SlotVInstall which I am doubtful is getting the actual tickcount. For instance,
on a IIsi w/ apple color monitor, the rate is reported at 1/62 second per tick,
just like the cat 1 machines. Is this correct? I would be very interested in
seeing a listing of the actual refresh rates of all of these machines and in
the case of the cat 2 machines, the refresh rates with standard apple cards and
monitors -- is there anyone at apple that can post this info. In addition, I
have received several suggestions on how to get the tickcount for each machine
and then sync copybits to this, but most if not all schemes seem to fail under
some circumstances. Couldn't apple just give us a toolbox or system call for
supplying the moment of refresh? Also, is the tickcount value still 60.15 ticks
per second and is it used for determing the value of the event.when field in
events?

Mike Tarr
tarr@cs.yale.edu