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From: callen@inmet.UUCP
Newsgroups: comp.sys.mac
Subject: Re: new ROMs and 3rd party upgrades
Message-ID: <127200005@inmet>
Date: Wed, 29-Apr-87 11:00:00 EDT
Article-I.D.: inmet.127200005
Posted: Wed Apr 29 11:00:00 1987
Date-Received: Sat, 2-May-87 01:24:21 EDT
References: <127200004@inmet>
Lines: 26
Nf-ID: #R:inmet:127200004:inmet:127200005:000:1272
Nf-From: inmet.UUCP!callen    Apr 29 11:00:00 1987


OK, let's try this again, without the flame, which I will apologize for
right now. I was pretty P.O.ed at the moment. Apple has given us some
slick machines. I don't like everything they do. ANYWAY...

What the original posting was REALLY about is this issue of whether or
not the latest revisions of the ROMs work with the Dr. Dobbs upgrade.
The dealer in question claims to have seen several cases of the latest
ROMs not working with 3rd party upgrades. In my friend's case, the 
dealer managed to dig up some OLD ROMs, and then all worked just fine.
I CAN'T vouch for the dealer, and since I haven't got the latest ROMs
to drop into my OWN Dr. Dobb's upgraded mac, I can't try it myself.
Since the dealer DID manage to get my friend's Mac upgraded, I don't
think that they were trying to pull a fast one (like sell him a new
logic board).
 
NOW - What's the difference between the DDJ upgrade and a REAL 512K
Macintosh? I suspect that there may be a difference in the address
decoding logic. If some address lines aren't being looked at by the 
DDJ upgrade that ARE looked at by a real 512K mac then conceivably
the code that looks for a SCSI boot device could get confused.

Any ideas?

-- Jerry "less heat, more light" Callen
   ...!{ihnp4,ima}!inmet!ada-uts!callen