🚀 go-pugleaf

In article <4127@polya.Stanford.EDU> kaufman@polya.Stanford.EDU (Marc T. Kaufman) writes:
>In article <17844@apple.Apple.COM> han@apple.com.UUCP (Byron Han, Architect) writes:
>
>-Upgrade paths starting from a standard Macintosh II:
>-1.  Get a PMMU.  
>-    End result? 68020/68881/68851 with standard floppy drives.
>-2.  Get a PMMU.  Get a floppy drive upgrade kit.  
>-    End result? 68020/68881/68851 with SuperDrive.
>-3.  Get a floppy drive upgrade kit.
>-    End result? 68020/68881 with SuperDrive.
>-4.  Get a logic board upgrade kit.  Get a floppy drive upgrade kit.
>-    End result? 68030/68882 with SuperDrive.  You have a Macintosh IIx.
>
>I presume it is also possible to get a 68882 only, thus giving faster math
>with no other changes.  (the '882 is upward compatible with the '881)
The '882 has bigger exception frames and such, so you have to be careful
that coprocessor state doesn't overflow into someplace else.  I believe that
it is possible to interrogate the FPC as to the size of its frames.

Portable applications written with Motorola's guidelines in mind should have
no problems, but I don't know if Apple's SANE stuff, for example, will deal
with these.  The FPU will probably cause more problems than the '030.

One example - Sun told us that we couldn't plug in our '882 until we
got SunOS 4.0, which presumably has LARGER hard-coded frame sizes.

Good luck, everybody! (At CMU, a Mac //x with 4M is $2000 more than a
Mac ][ with 1M.  I think I'll wait for the NeXT announcement.)
-- 
					- Ralph W. Hyre, Jr.
Internet: ralphw@ius3.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-)"