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From: jjs@burdvax.UUCP
Newsgroups: comp.sys.mac
Subject: True Mac+ Compatibility in Upgraded Macs
Message-ID: <3799@burdvax.PRC.Unisys.COM>
Date: Thu, 18-Jun-87 09:28:32 EDT
Article-I.D.: burdvax.3799
Posted: Thu Jun 18 09:28:32 1987
Date-Received: Sat, 20-Jun-87 07:30:53 EDT
Sender: news@burdvax.PRC.Unisys.COM
Organization: Unisys/Paoli Research Center, Paoli, PA
Lines: 31
Keywords: upgrades compatibility

A fellow Mac'r and I have run into an interesting (though minor) problem
and I would like to receive e-mail from knowledgable parties.

A demo program called Jam Session (dated around 9/85 according to the
Finder) was copied from some disks of PD/Shareware stuff at the recent
Drexel Mac Fair. It's supposed to play sound files generated by the
Studio Session program (I think that is its purpose). Some instrument
sounds and some sample songs were included in the folder containing the
Jam Session program.

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.

As a larger, though relevant issue, how much a Plus is an upgraded Mac?
I recall reading that there were some minor differences between an
upgraded machine, and an original, factory-produced Mac+. This topic
might be of interest to the newsgroup readership.

Thanks for any help.

Jim Solderitsch
Unisys, Paoli Research Center

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