On Tue, 9 Sep 2008, Ethan Dicks wrote:
  I have my sbc6120 here and wanted to do a little OS/8
programming, but I
 think I'm stumped for a particular bit of doco - according to the "OS/8
 System Reference Manual" (DEC-8-OSRMA-A-D), the User Service Routine is
 documented in the "OS/8 Software Support Manual" (DEC-8-OSSMA-A-D).  I've
 found many OS/8 docs on Highgate and Bitsavers (DEC-S8-OSSMB-A-D, the
 1974 "OS/8 Handbook", memos, etc.), but not that exact one. 
I have most of it HTMLized at
http://anachronda.homeunix.com:8000/~rivie/os8/ssm/ssm.htm
I just haven't gotten around to doing Appendix F yet.
But what I've got is just what's in this PDF file:
http://www.bitsavers.org/pdf/dec/pdp8/os8/DEC-S8-OSSMB-A-D_OS8_v3ssup.pdf
which, oddly enough, you seem to mention in your note.
--
roger ivie
rivie at 
ridgenet.net