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2000-06-30
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36 lines
BU-DDJ bug fix:
As BU-DDJ was being keyed, a typing error apparently found its way
into the C source code, viz. the user number range check has a multiply
instead of an add. This makes it easy to receive an error message, as
you can imagine. Not having a C compiler, I fixed the object code
directly, learning much about the Aztec compiler in the process.
If you're curious, I patched location 0376H from 'CD 79 43' to
'19 00 00' (from a call to the multiply routine, to an ADD). I have tested
the fix, and it apparently works ok. Caveat emptor, however.
If you would like to change the source and recompile it, you
would be doing all a favor. There is also a bug in the copying of a file
to the backup disk when the backup disk is exactly full with the -H option,
and a minor glitch when it protects split files. Try backing up a hard
disk, and you may reproduce these errors. It is to BU's credit that the
problems are easily gotten around, however.
I have been waiting for this utility since it appeared in the
Jan '85 issue of Doctor Dobb's (I don't have a C compiler, remember?),
and can testify to its usefulness. It beats any other public domain
backup utility I have seen, hands down. Try it!
Thanks to Ian Ashdown for writing & distributing it, and to D.L.
Finley to typing & compiling it.
Mark Hull
9 February 1986
Minneapolis, MN
(612) 571-6500