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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!ee!bloc1469
- From: bloc1469@ee.ee.uwm.edu (Gregory R. Block)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: A1200 - 68020EC ??
- Date: 11 Dec 1992 18:19:47 GMT
- Organization: Electrical Engineering Dept. University of Wisconsin - Milwaukee
- Lines: 36
- Message-ID: <1gam43INNfuj@uwm.edu>
- References: <1992Dec11.171145.13055@spartan.ac.BrockU.CA>
- NNTP-Posting-Host: 129.89.2.33
-
- In article <1992Dec11.171145.13055@spartan.ac.BrockU.CA> tmc@spartan.ac.BrockU.CA (Tim Ciceran) writes:
- >In article <1992Dec11.093004.10703@walter.cray.com> walterb@sequoia.cray.com
- >(Walter Boese Jr.) writes:
- >>What does the 'EC' in 68020 mean for the Amiga A1200.
- >No MMU.
-
- Actually, while true, that isn't what they moved. The 68020 has never
- had a built in memory-management unit. It has always been external in
- the form of a 68851.
-
- No, with the 68EC020, the only difference is the packaging and a loss
- of some pins: Let me explain.
-
- The 68EC020 has a 32-bit dataspace, and operates in 32-bits. They
- have removed 16-bits of dataspace, though it still operates in
- 32-bits. So while everything is the same as the 68020, the 68EC020 is
- limited to a 16-megabyte address space.
-
- Make sense? Thought so. :)
-
- >Expense. The EC020 is quite suitable for an entry-level machine and
- >most people will not be inclined to run Unix or virtual memory on
- >such a machine. The alternative is another 68000. Don't give them any
- >ideas :).
-
- Well, actually, I do believe that the EC020 is around for embedded
- control applications. You know, 68EC020, 68020 for Embedded Control?
- ;)
-
- Greg
-
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