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- Newsgroups: comp.sys.mac.hardware
- Subject: Re: Jazzing Up Your Mac LC
- Message-ID: <1993Jan7.163305.315@physc1.byu.edu>
- From: seth@physc1.byu.edu
- Date: 7 Jan 93 16:33:05 -0700
- References: <1993Jan7.165436.23704@tadtec.uucp>
- Distribution: world
- Organization: Brigham Young University
- Lines: 21
-
- > a socket for an FPU, and Focus recommend MC68882. Question is, will an
- > MC68881 work? The 68882 part is out of stock at all the places I've
-
- One question is availability. Unless you happen to already have an MC68881
- collecting dust or something, I would bet dollars to donuts you won't be able
- to find one, at least not any easier than you would be able to find the '882.
- Another question is speed. If you buy an fpu, I presume you actually have a
- need for the extra speed in math calculations. In this case, it wouldn't be
- wise to use the '881 instead, because it is not as fast. The '882 is capable of
- limited simultaneous execution of instructions, in that with some instructions
- it allows a second instruction to load and decode etc. while the first inst. is
- still executing. A program written to take advantage of this will run faster on
- the '882 than the '881, which has to wait to do anything with an instruction
- until the previous instruction is completely finished with everything.
- Hope this helps.
-
- Seth Leigh
- BYU Physics Dept.
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