Blinking Light program for PDP-11

Ashley Carder wacarder at usit.net
Thu Dec 2 13:47:54 CST 2004


> 
> Hi Ashley,
> 
> Good enough.
> 
> FWIW, Guy's program decodes to the following:
> 
> 001000 005000    CLR R0
> 001002 005200 1: INC R0
> 001004 006100    ROL R0
> 001006 000005    RESET
> 001010 000775    JMP 1B
> 
> The instruction of interest is the RESET, which sends an INIT to
> the UNIBUS for 10ms. It must also have the effect of displaying
> the contents of R0 in the DATA display, or perhaps whatever register
> was last referenced. I figured that there was an instruction which
> would behave in this manor, but did not recall what it was...
> 
> --tom

Tom,

Thanks for decoding it.  I had planned to pull out my 11/40 handbook
and do that as well, but haven't gotten around to it.  After getting the 
machine running smoothly and booting several various bootable packs,
I decided to take the rest of the night off.

Ashley




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