🚀 go-pugleaf

In article <1989Dec12.0...@sq.sq.com> m...@sq.com (Mark Brader) writes:
>This is the way Ed Nather posted it.  (More precisely, it's the way
>Matt Crawford reposted it in 1987.)
...
>     Mel's job was to re-write
>     the blackjack program for the RPC-4000.
>     (Port?  What does that mean?)
>     The new computer had a one-plus-one
>     addressing scheme,
>     in which each machine instruction,
>     in addition to the operation code
>     and the address of the needed operand,
>     had a second address that indicated where, on the revolving drum,
>     the next instruction was located.
>     In modern parlance,
>     every single instruction was followed by a GO TO!
>     Put *that* in Pascal's pipe and smoke it.

Ah, the memories.  RPC-4000 and other 1+1 machines had no special code
to transfer to a subroutine.  It wasn't necessary.  Since each instruction
contained the address of the next instruction, all that was needed was
to leave an unused memory location at the end of each subroutine.  Then
to do a subroutine transfer, you picked up the instruction to which you
wanted to execute as the first line of code after the return and cpied
into that empyt space right after the subroutine.

That's all it took.
-- 
--Dick Wexelblat  (rw...@ida.org) 703 824 5511
  Hack mir nisht kein chaynik.