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- From: serhody@rodan.acs.syr.edu (Stephen e. Rhody)
- Subject: Re: Max Memory for a Mac II
- Message-ID: <1992Nov7.110929.25432@newstand.syr.edu>
- Organization: Syracuse University, Syracuse, NY
- References: <1d8vluINN57c@rave.larc.nasa.gov> <noah-041192152509@noah.apple.com> <1992Nov5.154334.13266@wlbr.iipo.gtegsc.com>
- Date: Sat, 7 Nov 92 11:09:29 EST
- Lines: 39
-
- In article <1992Nov5.154334.13266@wlbr.iipo.gtegsc.com> fdm@WLV.IIPO.GTEGSC.COM (Frank D. Malczewski) writes:
- >In article <noah-041192152509@noah.apple.com> noah@apple.com (Noah Price) writes:
- >#In article <1d8vluINN57c@rave.larc.nasa.gov>, wjb@cscsun2.larc.nasa.gov
- >#(William J. Bene) wrote:
- >#> What is the maximum memory for a Mac II? I have heard that you can break the
- >#> 8 meg barrier using System 7 which provides 32 bit addressing. Is this true?
- >#> Does it run like a dog? What problems may I run into if I go this route?
- >#
- >#On the _original_ Mac II, you are limited by the ROMs to 8 MB. The
- >#SuperDrive upgrade comes (came?) with new ROMs which fix this. Then, you
- >#are the same as a Mac IIx as far as DRAM is concerned. For example, you
- >#can use SIMMs made from 4 MBit DRAM, but they need a PAL to suppress a test
- >#mode. See the Macintosh Memory Configurations technote for details.
- >#
- >#To access more than about 13 MB (the exact number depends on how many NuBus
- >#cards you have), you need MODE32 and System 7 for 32-bit addressing to take
- >#advantage of this additional DRAM.
- >
- >
- >True or False: The SuperDrive upgrade is not necessary to add the special
- >PAL 4MB SIMMs to one of the Mac II's memory banks, giving 20MB total.
- >
- >My answer was "True", based on my last reading of the M.M.C. TN. Did I read
- >it too quickly? (I've read various versions of the TN, even the version
- >which first revealed the SuperDrive/ROM requirement, but (one of) the
- >latest version(s) of this TN seemed to indicate that the SuperDrive upgrade
- >was NOT needed).
- >--
- >
- >Frank Malczewski (fdm@wlv.iipo.gtegsc.com)
-
- Mac II's do not need the SuperDrive upgrade to use PAL 4MB SIMMs. All you
- need is a PMMU and Mode32. I just did this upgrade one month ago and
- everything is working fine.
-
- Does anyone know whether 80ns PAL SIMMs can be used in Quadras?
-
- Steve
-
-