Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pasteur!agate!saturn!ssyx.ucsc.edu!koreth
From: koreth@ssyx.ucsc.edu (Steven Grimm)
Newsgroups: comp.sys.atari.st
Subject: Bomb list
Message-ID: <2905@saturn.ucsc.edu>
Date: 19 Apr 88 16:43:03 GMT
Sender: usenet@saturn.ucsc.edu
Reply-To: koreth@ssyx.ucsc.edu (Steven Grimm)
Organization: The American Redundancy Society of America
Lines: 34

Here's a list of what the various numbers of bombs mean...

 1 - Impossible.  If you get 1 bomb, take your ST to a repair shop.
 2 - Bus error.  This means you have tried to access memory outside the
     computer's valid address space (or tried to access a protected area
     in user mode).
 3 - Address error.  This usually results from doing a word or long
     operation on an odd byte boundary.
 4 - Illegal instruction.  You figure it out.
 5 - Divide by 0.  Usually generated by the divs and divu instructions,
     though if I recall correctly some others can cause it as well.
 6 - CHK instruction trap.  If a chk instruction returns an illegal value,
     this trap is executed.  Chk is actually pretty dumb, in my opinion,
     unless you're using Pascal.
 7 - TRAPV instruction.  You get this by executing a trapv instruction
     when the overflow bit is set.  Most programs don't use trapv, so this
     one shouldn't pop up much.
 8 - Privilege violation.  This one appears when a supervisor-only instruction
     is encountered in user mode.
 9 - Trace.  If you've got the trace bit set, this trap will occur after
     each instruction.  Great for debuggers.
10 - Line-A.  You shouldn't get this, as it's the interface Atari uses to get
     to graphics routines.
11 - Line-F.  This is supposed to be a hook for math coprocessors, but Atari
     (DRI?) used it for GEM instead.  I would have preferred a coprocessor.

The others are pretty much undefined; if you get one, something weird is
going on.  From 32 to 47 bombs mean that you made a trap call whose vector
wasn't set.

Note that the number of bombs is equivalent to the 68000 exception number.

Hope this helps people.

-Steve