From: ldo@nz.invalid   
      
   On Thu, 15 Aug 2024 17:47:51 +0100, James Harris wrote:   
      
   > Of course, it could be possible to run into more PIO memory than 32   
   > words as long as the requisite jumps were back to the initial 32-word   
   > space but that would be awkward to use, and limiting.   
      
   Or, you could bring back the old PDP-8 trick, of having the jump address   
   be in the *current page*. That means the upper bits are taken from the   
   current program counter.   
      
   There was actually a separate mode bit that indicated whether the address   
   was in the current page or page 0. And another bit to indicate whether the   
   access was indirect (i.e. don’t take the contents of that address, take   
   the contents of the contents).   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)