Commodore VIC-20 Programmer's Reference Manual page 155

• A 1409 BNE $1402 no—go back and do more.
• A MOB BRK yes—return to VICMon.
To see the VIC print the alphabet, type the familiar command:
.G 1400
The comments that are beside the program explain the program
flow, and logic. If you are writing a program, write it on paper first,
and lest it in small parts if possible.
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