Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!batcomputer!mha From: mha@batcomputer.tn.cornell.edu (Mark H. Anbinder) Newsgroups: comp.sys.mac Subject: Re: Virtual, how many megs? Message-ID: <7701@batcomputer.tn.cornell.edu> Date: 9 Apr 89 01:05:55 GMT References: <2615@osiris.sics.se> <6514@bsu-cs.UUCP> <90725@felix.UUCP> Reply-To: mha@tcgould.tn.cornell.edu (Mark H. Anbinder) Organization: Department of Media Services, Cornell University, Ithaca NY Lines: 53 In article <90725@felix.UUCP> kehr@felix.UUCP (Shirley Kehr) writes: >In article <6514@bsu-cs.UUCP> mithomas@bsu-cs.UUCP (Michael Thomas Niehaus) writes: >, 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? > > >I thought the question was about the Virtual init. I presumed that Olle >was either using A/UX or looking ahead to the future when the 8Mbyte >limit didn't exist. > >I suspect the answer is that Virtual might not access more than 8 Mbytes >today, but that there is no reason for any limit as soon as it is usable >by the Mac. They already did a second version of the init for 030 machines >so they seem committed to keeping up. As to A/UX support, I suspect you'd >have to ask them. Actually, Virtual does not work with A/UX, which uses its own virtual memory scheme. Both Michael and Shirley are correct that the limit of 8 megabytes RAM is a limit within the operating system, and NOT with the Virtual software from Connectix. So, the answer to Olle's question is that Virtual is utterly useless to him, RIGHT NOW, if he already has 8 megabytes of physical memory. All he'd be doing is making a perfect copy of physical memory on his hard drive. That brings up a couple of potentially interesting possibilities for crash-recovery, but I won't get into that now. :-) Connectix is indeed dedicated to continuously updating Virtual to take advantage of all improvements to the Mac, in both hardware and software. Virtual currently runs on all 68020 and '030 machines, i.e. Mac II, IIx, IIcx, and SE/30. As soon as the Macintosh operating system supports the use of more than 8 megs, it's quite likely that Connectix will be there with a version of Virtual that can give you as much memory as you're willing to give it disk space. :-) Good thing magnetic SCSI storage is cheaper than DRAM! :-) Calling Connectix is definitely a good idea if you want more information about what's likely to be available when. Their number is 415-324-0727 (Pacific Daylight Time). Unfortunately, Connectix is not yet on the net. Disclaimer: I am not involved with Connectix except as an EXTREMELY happy customer. I keep in touch with them, so if you have any questions, feel free to ask me. If I don't know, I'll find out. -- Mark H. Anbinder ** MHA@TCGould.tn.cornell.edu NG33 MVR Hall, Media Services Dept. ** THCY@CRNLVAX5.BITNET Cornell University H: (607) 257-7587 ******** Ithaca, NY 14853 W: (607) 255-1566 ******* Ego ipse custodies custudio