🚀 go-pugleaf

I'm looking for a utility that will (attempt to) repair a corrupted ZOO
archive.  I have a ZOO file that contains several ARCed text files (it's a
long story...) but the first disk sector on which the ZOO originally resided
went bad, and got filled with a random character on a subsequent copy.  There
is only one file I want to extract from the archive, and it begins well into
the file.  Hence it's fully intact, but I need to reconstruct the start of the
ZOO so that the extractor won't choke on it.  Help!

Also, I'm looking for a DOS (non-Windows) screen saver that will properly
restore to a 50-line VGA text screen when it exits.  I'm running a terminal
program (Telix) in 50-line mode, and all the screen savers I've tried so far
(Explosive, Inner Mission, etc.) drop back into 25-line mode when a key is
pressed, requiring me to manually set the terminal back into 50-line mode
each time, and thereby cancelling the convenience of the screen saver in the
first place.  Switching to 50-line mode is no big deal with a simple BIOS
call, but nobody seems to check for it.

Any ideas, pointers, or hints on these topics would be gratefully accepted.

-- 
Russell J. Gladden : rjg@garfield.cs.mun.ca | "As the people here grow colder
134-B Patrick Street, St. John's /~~~~~~~~~~|  I turn to my computer, and
Newfoundland, Canada, A1E 2T1. /    Crisis? |  spend my evenings with it
Telephone: (709) 753-5463.   / What Crisis? |  like a friend..." -- Kate Bush.