What does PUSHJ do? (was Re: was "C on the PDP-8 ... ")

[Sean 'Captain Napalm' Conner]

It was thus said that the Great vrs once stated:
> 
> >   What does PUSHJ actually do?  I remember reading about it in Steven Levy's
> > Hackers, but never got what was so special about it.
> 
> PUSHJ does a CALL, using a software implementation of a stack, which allows
> the target subroutine to be recursive.  JMS stores the return address in the
> entry point, so it won't do (without help) for recursive routines.
> (Similarly, POPJ is like RET.)

  Oh, PUSH-JUMP.

  -spc (Okay, that makes sense now ... )