PDP 11/45 light chaser

[Jay West]

Jim wrote....
> Location    Content Op-code            comment
> 001000    012700    mov #1,r0        load ro with 1
> 001002    000001
> 001004    006100    rol                    rotate r1 left
> 001006    012701    mov delay r1    load register r1 with delay
> 001010    007777    delay
> 001012    005301    dec r1                decrement register 1
> 001014    001376    bne -2                continue to decrement r1 until
> r1=0
> 001016    000772    br -12                back to 001002 (dec r0)

This runs on my /45, but produces a steady light display, not a cylon or 
"blinking" effect. It's been decades since I looked at '11 assembler. I'm 
confused about something in the listing above. If the 012700 at location 
1000 is a load r0 with 1, I'm guessing the next word (1002) is the constant 
to be loaded? So, why would the branch at location 1016 go back to the data 
at 1002? Obviously there's something I'm missing. Guidance? If 1002 is a DEC 
R0 instruction, then where's the constant "1" for the mov#1,r0 stored in the 
object? Humm?

Jay