From: David Griffith Sent: Monday, March 07, 2016 11:53 PM > Specifically I'm trying to build and run this:
> TITLE HACK > SEARCH MONSYM > > HACK: SKIPA 4,[^D4] > HACK0: SOJL 4,TRAILL > SETZB 1,3 > HACK1: TLNE 1,777777 > JRST HACK0 > MOVE 2,1 > CIRC 2,-^D18 ^^^^^^^^^^^^ ... > END HACK > When I do COMPILE, LOAD, and SAVE on it and run the executable, I get this: > $hack > ?Illegal instruction 247100,,777756 at HACK1+3 > ?Undefined operation code As well you should. There is no CIRC in the standard PDP-10 instruction set. Opcode 247 is unassigned, so if someone defined CIRC locally (say, in an OPDEF, although I don't see one here), the result you report would be precisely what I would expect. Where did this code come from? From the presence of the LITES% JSYS I infer that it has something to do with Bob Armstrong's panel. Perhaps you should direct a query in his direction? SpareTimeGizmos.com, and all that. Rich Rich Alderson Vintage Computing Sr. Systems Engineer Living Computer Museum 2245 1st Avenue S Seattle, WA 98134 mailto:ri...@livingcomputermuseum.org http://www.LivingComputerMuseum.org/