Help-Bus Errors

[Tim Wood]

In article <1990Feb10.192028.16025 at eddie.mit.edu> aryeh at eddie.MIT.EDU (Aryeh M. Weiss) writes:
>SIGBUS errors are
>quite machine dependent, but in my experience can be caused by ...
>[referencing] an odd address with a word oriented instruction
>(this is a no-no on Vaxes and 68000's, but 80x86 systems don't mind).
		     ^^^^^
The VAX does not have alignment restrictions, that is,
one may read or write a multi-byte operands at a byte-boundary address.
Doing this incurs some performance penalties on the VAX, as well as
making your program less portable.  The trend these days, especially with
RISC, seems to be toward alignment restriction.  Nice explanation of coredump 
signals, BTW.
-TW
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