In hindsight…this was easy. However I first tried CREATE which was supposed to be a valid command. But wasn’t!
>CREATE
?CREATE ?
CCL -- Syntax error, unknown or ambiguous command
>
Found EDT, which worked!
>@ <EOF>
>EDT HELLO.COB
Input file does not exist
[EOB]
*INSERT After the INSERT, I pasted in a short program
IDENTIFICATION DIVISION.
PROGRAM-ID. hello.
PROCEDURE DIVISION.
DISPLAY "Hello, world!".
STOP RUN.
^Z Ctrl Z
[EOB]
*EXIT
DU0:[USER]HELLO.COB;1 5 lines
>DIR *.COB
Directory DU0:[USER]
18-SEP-2021 18:04
HELLO.COB;1 1. 18-SEP-2021 18:04
Total of 1./1. blocks in 1. file
>TYPE HELLO.COB
IDENTIFICATION DIVISION.
PROGRAM-ID. hello.
PROCEDURE DIVISION.
DISPLAY "Hello, world!".
STOP RUN.
>