gillies@p.cs.uiuc.edu (08/16/89)
My calculations show that 217088 bytes of memory are unused by the Mac
II video card. That is, assuming that an 8-bit video card requires
512K of dual-ported DRAM, and the display only uses 640*480 = 307200
bytes of memory (108544 unused bytes on a 4-bit card).
Does Color QuickDraw use this memory for something useful? Has anyone
written code to exploit this extra memory? It seems like an ideal
place to put a disk cache, or temporary pixel maps. I was just
wondering.
Don Gillies, Dept. of Computer Science, University of Illinois
1304 W. Springfield, Urbana, Ill 61801
ARPA: gillies@cs.uiuc.edu UUCP: {uunet,harvard}!uiucdcs!gilliesamanda@intercon.uu.net (Amanda Walker) (08/17/89)
In article <104700059@p.cs.uiuc.edu>, gillies@p.cs.uiuc.edu writes: > My calculations show that 217088 bytes of memory are unused by the Mac > II video card. [...] It seems like an ideal > place to put a disk cache, or temporary pixel maps. I was just > wondering. What I think would be nifty would be to have a little INIT (like RasterOps does) that tells Quickdraw it has, say, a 720x720 screen and pans around it as the mouse hits the edges of the visible area. The Mac II video board does have hardware support for this sort of thing... -- Amanda Walker InterCon Systems Corporation -- amanda@intercon.uu.net | ...!uunet!intercon!amanda
mikem@uhccux.uhcc.hawaii.edu (Mike Morton) (08/25/89)
Some time back, Don Gillies wrote: >My calculations show that 217088 bytes of memory are unused by the Mac >II video card... > >Does Color QuickDraw use this memory for something useful? Has anyone >written code to exploit this extra memory? It seems like an ideal >place to put a disk cache, or temporary pixel maps. I was just >wondering. A disk cache in your video RAM... maybe we should call this a "video disk"? Remember, you heard it here first ;-) -- Mike Morton // P.O. Box 11378, Honolulu, HI 96828, (808) 676-6966 HST Internet: mikem@uhccux.uhcc.hawaii.edu (anagrams): Mr. Machine Tool; Ethical Mormon; Chosen Immortal; etc.