Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!rochester!pt.cs.cmu.edu!ius3.ius.cs.cmu.edu!ralphw
From: ralphw@ius3.ius.cs.cmu.edu (Ralph Hyre)
Newsgroups: comp.unix.aux
Subject: Re: 68882 in a Mac II
Keywords: A/UX
Message-ID: <4225@pt.cs.cmu.edu>
Date: 8 Feb 89 22:20:56 GMT
References: <1927@pur-phy> <25129@apple.Apple.COM>
Organization: Carnegie-Mellon University, CS/RI
Lines: 16

>... can I just pop the '881 out of my Mac II (A/UX) and drop in the '882?

[no]	... The '882 has a larger saved register stack during
	interrupts, which required a changed to the UDOT stack space
	in A/UX 1.0.1 (the one which runs on the 68030).

Didn't Motorola document a way to interrogate the FPC to ask how large its 
stack and other frames will be?  If so, then it's too bad the NOBODY
seems to have used it in their OS kernels, thereby requiring an OS upgrade
when the '882 came out.  (on a Sun, we're told that dropping an '882 in
will typically cause the u_area to be overwritten, with bad results.)
-- 
					- Ralph W. Hyre, Jr.
Internet: ralphw@{ius{3,2,1}.,}cs.cmu.edu    Phone:(412) CMU-BUGS
Amateur Packet Radio: N3FGW@W2XO, or c/o W3VC, CMU Radio Club, Pittsburgh, PA
"You can do what you want with my computer, but leave me alone!8-)"
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