Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!spool.mu.edu!uwm.edu!linac!midway!ellis.uchicago.edu!jcav From: jcav@ellis.uchicago.edu (john cavallino) Newsgroups: comp.sys.mac.hardware Subject: Re: LC video vs. SI video... Message-ID: <1991Mar6.153527.10335@midway.uchicago.edu> Date: 6 Mar 91 15:35:27 GMT References: <1991Mar6.094536.125@otago.ac.nz> <1991Mar6.015922.6940@mintaka.lcs.mit.edu> Sender: news@midway.uchicago.edu (News Administrator) Organization: University of Chicago Lines: 24 In article <1991Mar6.015922.6940@mintaka.lcs.mit.edu> dbert@pogo.ai.mit.edu (Douglas Siebert) writes: >In article <1991Mar6.094536.125@otago.ac.nz> michael@otago.ac.nz writes: >>In article , ingemar@isy.liu.se (Ingemar Ragnemalm) >>writes: >>> This only occurs when the running program is located in the lowest meg, >>> thus sharing that meg with the video. A program running in a higher part >>> of the memory runs at full speed even in 8-bit mode. > >Everyone is talking about the "low" megabyte in memory though....WRONG! Unless >you have a 2M computer, you will be talking about the low FOUR megabytes of >memory, since the 1M simms are banked together in groups of four, all sharing >the same block. I know my terminology is probably not correct and likely >confusing....perhaps someone else can explain it better than I....but I'm >pretty sure this idea should hold. Once again, in the IIci and IIsi, the RAM to which access is shared with the internal video circuitry is ONLY IN BANK A. This memory could total 1mb, 4mb, 8mb, 16mb, etc. with the appropriate SIMM sizes. -- John Cavallino | EMail: jcav@midway.uchicago.edu University of Chicago Hospitals | USMail: 5841 S. Maryland Ave, Box 145 Office of Facilities Management | Chicago, IL 60637 "Opinions, my boy. Just opinions" | Telephone: 312-702-6900