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- Path: sparky!uunet!stanford.edu!rutgers!ub!acsu.buffalo.edu!yaosenko
- From: yaosenko@acsu.buffalo.edu (Yaosen Ko)
- Newsgroups: comp.sys.mac.misc
- Subject: Re: Upgrading 68881 to 68882 on Mac II
- Message-ID: <BuH4MF.5qI@acsu.buffalo.edu>
- Date: 12 Sep 92 16:32:38 GMT
- References: <9209110717.AA10670@teetot.acusd.edu>
- Sender: nntp@acsu.buffalo.edu
- Organization: UB
- Lines: 18
- Nntp-Posting-Host: lictor.acsu.buffalo.edu
-
- In article <9209110717.AA10670@teetot.acusd.edu> resch@TEETOT.ACUSD.EDU (Keith Resch) writes:
- >
- >I have a Mac II and I want to upgrade my 68881 FPU to a 68882 FPU. I
- >once read that this was not much more than a simple swap of the two
- >chips, is this true? Will I gain any speed by doing this swap?
- >Also I would like to upgrade my HMMU to the 68851 PMMU, will I gain
- >anymore than just the ability to use Virtual Memory?
- >thanks
- >
- 68882 is pin-compatible with 68881, so it's pretty safe to swap the chips.
- (Don't bend their legs, though)
-
- Will you gain any increase in speed? Hard to say, it depends on what
- you will be running. For word processor, no difference at all. For
- complex CAD or rendering program, you will get significant boost.
-
- BTW, what is HMMU? In additional to using virtual memory,
- PMMU lets you run A/UX (Apple's UNIX) on Mac II.
-