Q's:
1) Are any these titles already backed up somewhere?
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many of them have been. The license PAKs are less common
2) What is the best way to backup these tapes to a more
permanent media?
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I use Eric Smith's tape copy program
http://www.brouhaha.com/~eric/software/tapeutils/
which generates .tap images
on a Linux box using a TZ30.
TZ30's are handy because the head is easily disassembled to clean;
something you do a LOT reading TK50's from the mid-80's
3) What is "MICROVMS" - Is this just VMS (for a uVAX)?
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correct. somewhat stripped down version of same.