Answering msg from Bill Grimsley to Paul Edwards,
on Saturday May 27 1995 at 07:09

 BG>> 1.  QEMM Exception #13 at 6620:FFFF, error code: 0000
 BG>> AX=0925 BX=6F77 CX=6B72 DX=7720 SI=7469 DI=2068 BP=6168
 BG>> DS=6472 ES=6177 SS=393C SP=1E3A Flags=7782
 BG>> Instruction: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

 BG>> Different registers each time, but the same instruction (00 x 15
 BG>> times).

 PE>> I don't know how to debug using this.

 BG> Neither do I.  Sadly, mine is an "evaluation" copy of
QEMM 7.02, the
 BG> special one which has no documentation or manuals.  |-)

    Simple, you load it into your favourite debugger (even DEBUG might do
the trick), and enter the instruction bytes, and view the corresponding
disassembly. If it's an obvious coding error then it will show up, if
you're lucky. However "00 00 ..." is not normal code. ;-)

    Next step is to note the address that it happened, fire up a debugger,
and place a breakpoint just before it so you can see what is about to go
wrong. It won't help in cases like the above where code has been
overwritten or it returns from a function to the wrong place in the code.

    BTW, you can upgrade your evaluation copy of QEMM 7.02 to at least 7.04
by using patches, with no charge. Upgrading to 7.5 requires a new
evaluation copy.

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