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From: Jim.Spencer@p510.f22.n282.z1.fidonet.org (Jim Spencer)
Newsgroups: comp.sys.mac.programmer
Subject: What's System Error 12, exactly?
Message-ID: <670554754.1@mmug.fidonet.org>
Date: 1 Apr 91 04:23:48 GMT
Article-I.D.: mmug.670554754.1
Sender: UUCP@mmug.fidonet.org
Lines: 15


Eric Bowman writes in a message to All

EB> Does anyone have any suggestions for what might cause a System 
EB> Error 12? IMII says it's an "Unimplemented Core Routine: An unimplemented 
EB> trap number was encounted." 
EB> It only happens inside a printing loop, on an app run over a 
EB> network, on a Mac Plus. Everything works fine on a Mac II, heap 
EB> scrambling or no. It's compiled for a 68000; written in MPW C++, 
EB> and compiled using C 3.2b1 (optimizer on -- might this be the 
EB> problem?) 
EB> Any suggestions would be greatly appreciated.

I don't profess expertise but could you be calling a trap that is not provided on a Plus, like a Color QuickDraw routine?  Compiling for a 68000 only means you won't use FPU instructions, etc., not that you won't call a ROM routine which doesn't exist on the target.  You don't get a compile or link error because you have the correct interface files and libraries.