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From: tgoose@eng.umd.edu (Jason Garms)
Newsgroups: comp.sys.mac.hardware
Subject: Re: What do Rev B ROMs do?
Message-ID: <1991Jun4.191352.8623@eng.umd.edu>
Date: 4 Jun 91 19:13:52 GMT
References: <1991Jun3.211128.13792@leland.Stanford.EDU>
Sender: news@eng.umd.edu (C-News)
Reply-To: tgoose@eng.umd.edu (Jason Garms)
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 20

In article <1991Jun3.211128.13792@leland.Stanford.EDU>, brod@jessica.Stanford.EDU (Brodie Lockard) writes:
> What do the Rev B ROMs in a Mac II do that the Rev A ROMs did not?
> Didn't this upgrade have something to do with 32-bit addressing?
> What's the difference between a Rev B ROM upgrade and the upgrade
> everyone wants Apple to provide to allow 128MB of RAM?
> 
> Brodie Lockard
> brod@jessica.stanford.edu
> 
> Brodie Lockard      brod@jessica.stanford.edu

The major feature that I know of is it allowed you to address more NU BUS
cards with more than 1 MB of RAM.  Rev A ROMs wouldn't work with these cards.

For the record.  This was a free upgrade from Apple if you could show proof
of purchase of a product that needed the new ROMs.

Have a good day,
Jason Garms
tgoose@eng.umd.edu