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From: mrh@Shasta.STANFORD.EDU (Marc Hannah)
Newsgroups: comp.sys.mac
Subject: Re: True Mac+ Compatibility in Upgraded Macs
Message-ID: <1796@Shasta.STANFORD.EDU>
Date: Sun, 21-Jun-87 16:46:01 EDT
Article-I.D.: Shasta.1796
Posted: Sun Jun 21 16:46:01 1987
Date-Received: Tue, 23-Jun-87 01:32:29 EDT
References: <3799@burdvax.PRC.Unisys.COM>
Organization: Stanford University
Lines: 17
Keywords: upgrades compatibility
Summary: parameter ram?

In article <3799@burdvax.PRC.Unisys.COM>, jjs@burdvax.PRC.Unisys.COM (James Solderitsch) writes:
> This program loads ok on my upgraded Mac (128K to Mac+) but bombs
> immmediately (ID= 02) when I try to load one of the demo song files.
> On the other hand, on my friend's factory fresh Mac+, the program does
> in fact work. We made a single DS boot disk containing the folder with
> Jam Session and tried it on both machines with the result that it works
> on the real Mac+, but not on my upgraded Plus. All leads on the source
> and/or correction to this problem are welcomed.
> Jim Solderitsch
    
     I suspect that you've got the RAM cache on in one case and not in the
other. If you really want to test this, it is probably a good idea to
remove peripherals (like hard disk), remove the battery for a few minutes,
then boot up. You have to be careful about claiming that the machines are
configured the same way. If you were to (say) have a 700K ram cache and
try and run a large program, you can find funny errors.
Good luck,  David Gelphman   daveg%slacvm.bitnet@forsythe.stanford.erc,