This post is a bit premature, I should look into things a bit more, but it ties into my post about the console display when the system is idle.
On OPSER:
!:what all
M2 4 1,2 ^C 00:00:00
M1 3 1,2 ^C 00:00:00
C 5 1,2 CDRSTK RN 00:01:01
B 6 1,2 BATCON HB 00:00:00
L 7 1,2 LPTSPL HB 00:00:00
PT 8 1,2 PTPSPL HB 00:00:00
CP 9 1,2 CDPSPL HB 00:00:00
7 10 1,2 ^C 00:00:00
!:kill c
CDRSTK seems to be a program responsible for reading batch jobs off the card reader and queues them for execution. Okay, it would be nice if that reads a Linux pipe or file or something, it could be a way to load files on to TOPS-10. I can write stuff to LPT: and find it in test.log.
At any rate, it goes into a loop and the console looks way too busy. The ":kill c" kills job "c", or 5, which is cdrstk and the system goes idle and the console lights are at PC 1 in the null job, as I expected. But they changed the null job on me, it's no longer a one instruction AOJA loop!
So, far TOPS-10 is running happily without CDRSTK, not a surprise.