I'm writing a little program in H316 assembler, running it in simh (3.8-1). The usual idiom for returning from a subroutine seems to be an indirect jump through a pointer. But my indirect jump halts at the location where the pointer is stored. The code looks something like this: ... ... subr dac ** ... do some stuff jmp* subr The jst is supposed to drop the address of from+1 into location subr, and execution continues at subr+1. The indirect jmp (jmp*) should be the return, getting the target address showing this kind of thing. Best I can tell, the assembled code has all the correct bits set -- the indirect bit is the high order bit in the word, and is set, opcode looks correct, etc. The correct target address is indeed stored at subr by the jst. Obviously this isn't re-entrant, etc. Don't care about that at this point. What am I doing wrong? Thanks, De