From: David Griffith
 Sent: Friday, February 26, 2016 4:05 PM
  One of my ongoing wish projects is to learn to
program a pdp-10 so I can
 port Frotz to it. 
 The canonical textbook is Ralph Gorin's _Introduction to
DECSYSTEM-20
 Assembly Language Programming_ (Digital Press, 1981).  Lots of examples,
 well thought out presentation.
 It's a shame that Ralph's book has become so rare.  (Seriously, who
 does the seller asking $1,441.25 for a copy think he's talking to???)
 Probably remaindered in the 1990s at any library that had a copy.
 If you were near Seattle, I'd say make an appointment and I'd give you
 an afternoon's worth of overview.
                                                                  Rich
 Rich Alderson
 Vintage Computing Sr. Systems Engineer
 Living Computer Museum
 2245 1st Avenue S
 Seattle, WA 98134
 mailto:RichA at 
LivingComputerMuseum.org
 http://www.LivingComputerMuseum.org/