Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!natinst!davoli
From: davoli@natinst.com (Russell Davoli)
Newsgroups: comp.sys.mac.misc
Subject: Re: 32-bit Clean ROM upgrade - list created.
Message-ID: <22093@natinst.natinst.com>
Date: 18 Apr 91 23:12:27 GMT
References: <FRANCIS.91Apr16175912@daisy.zaphod.uchicago.edu> <1991Apr17.125051.27864@terminator.cc.umich.edu>
Organization: National Instruments, Austin, TX
Lines: 15

In article <1991Apr17.125051.27864@terminator.cc.umich.edu>, jgs@merit.edu (John Scudder) writes:
> Come to think of it, I think that there is at least one precedent for ROM
> upgrades.  This had to do with a bug in the original Mac II ROMs, which
> Apple would swap for you gratis if you asked.  Unfortunately, I can't for
> the life of me recall the nature of the bug except that for most people
> it was rather obscure (maybe it only showed up under A/UX?).  Does anyone
> recall the details of this?
> 

The early Mac II ROMs couldn't switch into 32-bit mode to access the EPROMS
of NuBus boards that actually have 16 Mbyte address spaces.  This means
that the Slot Manager would not see the board and all the calls would
return an error.

--Russell