shahn@hstbme.mit.edu (Samuel Hahn) (01/10/90)
Three sets of questions: 1) 68882 vs. 68881. I have been told that the 68882 is pin compatible with the 68881. If this is true, can I replace the 68881 in my now-obsolete Mac II with a 16 MHz 68882? Will it work and if it does, will I see any performance in- crease? Also, are current compilers out there, e.g. THINK C 4.0, that generate inline code for the 68881 compatible with the 68882? 2) 68851 PMMU. Now that the prices have begun to become reasonable on these chips ($130-$150) is it worth getting one in anticipation of System 7.0 for my aforementioned obsolete Mac II? If anyone has already done this have they experienced any incompatibilties? 3) Old ROMS for the Mac II. A few years ago (maybe last year) I remember that Apple had fixed a bug in the Mac II's ROM. Something about a 1 meg address barrier in NuBus or something. Since I have the old ROMs, should I try to get a dealer to swap motherboards? I'm never really going to get a NuBus card that has RAM installed on it (i.e. a National Semiconductor 20 zillion megabyte board), but I am leery of other "silent" ROM changes that I may need in the future... Please respond via email and I will post a summary if asked... Thanks in advance! Sam Hahn shahn@hstbme.mit.edu