BobF
I used to be able to tell if a program was running correctly by the pattern of lights (neon push-indicators) flickering.  Of course these were highly repetitive routines (continuous gravity vector calcs), not like somebody listening to mp3s or running a word processing application.
 

 
 

Looks like an Ampeg.

9 81225 1 718125 251184.

57Gregy
9 81225 1 718125 251184.

49 20 6D 75 73 74 20 6E 6F 74 20 68 61 76 65 20 65 6E 6F 75 67 68 20 67 72 61 79 2E 2E 2E

EBG13 Ehyrm!

DrLumen
49 20 6D 75 73 74 20 6E 6F 74 20 68 61 76 65 20 65 6E 6F 75 67 68 20 67 72 61 79 2E 2E 2E

Better qualify that further...did you forget to append "matter" or "hair"?

At the end of every assembler line can be a continuation character that isn't seen except on a printout.  I used to hide Shakespeare quotes in my programs tweaked to use the names of people that may see the printouts.
 

****************************************
IDENTIFICATION DIVISION.
****************************************

PROGRAM-ID. HELLOWORLD.

****************************************
PROCEDURE DIVISION.
****************************************

10-MAIN.

PRINT "Hello World!"

20-END.

STOP RUN.