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From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.sys.apple2
Subject: Re: MMu on the IIgs
Message-ID: <14857@smoke.brl.mil>
Date: 14 Jan 91 20:06:42 GMT
References: <278d0eda.563e@petunia.CalPoly.EDU> <1991Jan11.065402.640@ux1.cso.uiuc.edu> <91011.085913AABENSON@MTUS5.BITNET>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 10

In article <91011.085913AABENSON@MTUS5.BITNET> AABENSON@MTUS5.BITNET writes:
>Okay, I've heard it said a couple times.  Orca uses COP for software
>interrupts.  Why is this?  I think BRK would have been a better choice.

Actually COP is used just for debugger traps; that's how the desktop
environment is able to move an arrow through the source code as it
executes, for example.

I don't know why COP rather than BRK.  COP does have subcodes, which
makes it convenient for the debugger.