Path: utzoo!utgpu!watmath!iuvax!bsu-cs!mithomas From: mithomas@bsu-cs.UUCP (Michael Thomas Niehaus) Newsgroups: comp.sys.mac Subject: Re: Virtual, how many megs? Message-ID: <6514@bsu-cs.UUCP> Date: 4 Apr 89 22:26:47 GMT References: <2615@osiris.sics.se> Organization: CS Dept, Ball St U, Muncie, Indiana Lines: 28 In article <2615@osiris.sics.se>, ollef@osiris.sics.se (Olle Furberg) writes: > How many Mb (maximum) do I get with the Virtual-init on a MacIIx/SE30 ? > Someone told me that I can't get more than 8 Meg. Suppose I have 8 Meg > HardWare memory, is Virtual of any use? > If it is a limit for Virtual, is this a general limit for the 030-MMU? This has been discussed before: Currently, the Mac operating system limits you to only (and I choke on only) 8MB of memory. In the future, I would expect to see a rewrite of the OS to allow for up to 32MB, but right now it is not feasible. So, in general 8MB is the limit, period, for any of the 020 or 030 machines. (I believe that the reason for the 8MB limit is that the ROM routines are mapped beginning right after this 8MB ceiling.) Unless of course you use A/UX. I don't believe that it has this restriction, allowing up to 32MB of real memory. I remember someone recently posting a message saying that they were using 4MB SIMMs (a set of 4 of these) giving them 16 MB, all of which was usable by A/UX, but the Mac II he was using just ignored the upper 8MB. Note that this didn't produce any problems. -Michael -- Michael Niehaus UUCP: !{iuvax,pur-ee}!bsu-cs!mithomas Apple Student Rep ARPA: mithomas@bsu-cs.bsu.edu Ball State University AppleLink: ST0374 (from UUCP: st0374@applelink.apple.com)