wieser@cs-sun-fsd.cpsc.ucalgary.ca (Bernhard Wieser) (12/21/90)
Greetings; I do lots 'o nifty experiments using various Macintosh for the psychology department here which require smooth 'animation'. How I do it is pregenerated all my 'frames' in advance before I blast them onto the screen (sometimes using copybits). Sometimes I use icons, since IM says (if I remember correctly) they work on a low level (i.e. ignoring window stuff and some QD; just a basic bytethrower). I draw my stuff, then wait for a slot vertical retrace interrupt from the video board. This has effectively removed flicker on our IIxs, cxs, IIs, (my SE30), etc... BUT I just recently ran one of this experiments on an si... My timing checks came back and told me I didn't miss an irq, however the image flickered miserably! Could it be that using main memory for video memory with the built in board slows it down sooo much? Contention for the cpu? Comments from anyone who also uses 1 vbl irq to drive drawing are appreciated. If you've tried your stuff on the si, does it flicker? -- ( Bernie Wieser, wieser@cpsc.ucalgary.ca, BSWieser@uncamult.BITNET ) ( 4rth Year Dbl.Mgr Cpsc Clhc University of Calgary | ) ( S/H Developer Dept. of Psychology, " " " \|/ ) ( Octavian Micro Development Group --- o --- )
Chris.Parson@f54.n382.z1.FIDONET.ORG (Chris Parson) (12/29/90)
You might scout out a IIci to try your code on to test your theory, since it and the si both use system memory for video. I recently attended a demo of the new Macs by an Apple rep and was suprised to learn that color video will be faster on an LC than an si because the LC has dedicated video memory. -- Chris Parson via cmhGate - Net 226 fido<=>uucp gateway Col, OH UUCP: ...!osu-cis!n8emr!cmhgate!382!54!Chris.Parson INET: Chris.Parson@f54.n382.z1.FIDONET.ORG
Chris.Parson@f54.n382.z1.FIDONET.ORG (Chris Parson) (12/30/90)
You might scout out a IIci to try your code on to test your
theory, since it and the si both use system memory for video. I recently
attended a demo of the new Macs by an Apple rep and was suprised to learn
that color video will be faster on an LC than an si because the LC has
dedicated video memory.
--
Chris Parson - via FidoNet node 1:105/14
UUCP: ...!{uunet!glacier, ..reed.bitnet}!busker!382!54!Chris.Parson
INTERNET: Chris.Parson@f54.n382.z1.FIDONET.ORG