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- Newsgroups: comp.sys.m68k
- Path: sparky!uunet!spool.mu.edu!uwm.edu!linac!att!mcdchg!mcdphx!gcall
- From: gcall@systemname.uucp (Glen Call)
- Subject: Re: CPU/FPU wiring
- Message-ID: <1993Jan7.153550.12724@phx.mcd.mot.com>
- Originator: gcall@
- Sender: gcall@systemname (Glen Call)
- Nntp-Posting-Host: tajmahal.phx.mcd.mot.com
- Organization: Motorola Computer Group Marketing
- References: <1993Jan6.165832.18756@schbbs.mot.com>
- Date: Thu, 7 Jan 1993 15:35:50 GMT
- Lines: 30
-
-
- In article <1993Jan6.165832.18756@schbbs.mot.com>, TMKT76@waccvm.corp.mot.com (Daniel Fusils) writes:
- |> >I'm interested to wire a system, which will be put to
- |> >68000 socket. It should contain a 68882 at 24mzh and
- |> >a 68010 with half that speed (My memory is 16bit thats
- |> >why 68010). System should have a 68851 MMU too.
- |>
- |> I don't think putting a 68851 with a 68010 is a good idea, since the
- |> protocole exchanged between a 68020 and the '851 is microcoded.
- |> Same comments for 68882. Even if you want to stick with a 16 bit memory,
- |> why don't you put together an '020 + '881 (or '882) + '851 (connected
- |> in 32 bit mode) and your 16 bit mem using the dynamic bus sizing
- |> mechanism?
-
- Better yet, why not combine a 68030 and 68882 and do the same trick. I'm not a
- H/W type, but I've heard of people doing this very thing. I wouldn't be
- surprised if someone has marketed a mezzanine board of this type. Anyone out
- there in net-land know of such a product? If not, how about a do-it-yourself
- project?
-
- If you do replace a M68000 with a MC68020 or MC68030, be advised that the
- exception handling will need some enhancement. Read The Fine Manuals.
-
- Glen
- ------------------------------------------------------------------------------
- Glen Call Technical Marketing Systems Engineer
- Motorola Computer Systems, Inc. gcall@phx.mcd.mot.com or mcdapps!gcall
- M/S DW212 phone: (602) 438-3408
- 2900 S. Diablo Way pager: 1-602-244-3252 Pager#2818 (digital)
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