Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!uxc.cso.uiuc.edu!uxc.cso.uiuc.edu!m.cs.uiuc.edu!p.cs.uiuc.edu!gillies From: gillies@p.cs.uiuc.edu Newsgroups: comp.sys.mac.programmer Subject: Video DRAM usage? Message-ID: <104700059@p.cs.uiuc.edu> Date: 15 Aug 89 18:07:00 GMT Lines: 15 Nf-ID: #N:p.cs.uiuc.edu:104700059:000:652 Nf-From: p.cs.uiuc.edu!gillies Aug 15 13:07:00 1989 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!gillies