Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!linac!att!ucbvax!UTCVM.BITNET!MQUINN From: MQUINN@UTCVM.BITNET Newsgroups: comp.sys.apple2 Subject: Re: Apple IIGS's Memory Limit Message-ID: <9106180211.AA16922@apple.com> Date: 18 Jun 91 01:46:11 GMT References: Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 28 On Mon, 17 Jun 1991 15:47:08 GMT Anthony J. Stuckey said: >andy@pro-palmtree.cts.com (Andy Stein) writes: >>Engineering's RamKeeper and two GS RAM Pluses with 8 Megabyes each, isn't >>the total memory capacity of the computer 17.125 Megabytes, with the ROM >>03's 1.125 Megabyte on board memory? Maybe I'm totally offbase, but that's >>what AE advertised. > >Except that I think you can aonly address 16 MB. The GS does use 24 bit >addressing, which gives a theoretical maximum of 16 MB. >I would be real surprised if 16 MB proved to be exceedable. The '816 can address up to 16MB of -memory-. Remember, that part of that memory is ROM, not RAM. The -practible- limit of RAM is 8MB. I assume the upper 8 megs are reserved for future expansion ROM and/or user upgradable ROM. If you have more than 8MB of RAM installed, you'd have to patch the memory manager use anything over the 8MB, but then, you still couldn't access it completely with current applications. For example, I doubt you'd be able to JML >8MB etc. without jumping to a ROM routine. I'm sure someone else could explain it much better than I'm doing now because I don't completely understand it myself. >-- >Anthony J. Stuckey >stuckey@ux1.cso.uiuc.edu ---------------------------------------- BITNET-- mquinn@utcvm <------------send files here pro-line-- mquinn@pro-gsplus.cts.com