68882 in a Mac II

[Rick Auricchio]

In article <1927 at pur-phy> wayne at pur-phy (Wayne K. Schroll) writes:
>
>    I have heard that the 68882 is pin-equivalent to the 68881.  Is this
>true?  If so, can I just pop the '881 out of my Mac II (A/UX) and drop
>in the '882?
	It is pin-compatible, but see below.

> Is there anything special I should know since my Mac II runs A/UX?
	Yes. 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).

	If you're running 1.0, certain operations (naturally, I don't
	know which) can stuff more bytes than there's room for, causing
	trouble.  I don't think it's a panic, but any stack overflow is
	generally bad.


>Finally, does anyone know of a good place to purchase a 68882 chip, and
>it's approximate cost?  Thanks for any information you can provide.
	Sorry, I don't know either on this one...

	BTW, 1.0.1 is essentially 1.0 with trivial changes...'030 and
	'882 support, and "tolerating" the FDHD hi-density floppy being 
	the most notable.  If you don't have the hardware need for it, you
	shouldn't worry about it.
-- 
Rick Auricchio, Apple Computer Inc, 20525 Mariani Av MS 27AJ Cupertino CA 95014
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