Retro1.org codex

BEGIN                                                    CP Privilege Class:  G

Use the BEGIN command to continue or resume execution in the virtual machine at
either a specified storage location or the location pointed to by the virtual
machine's current program status word (PSW). The format of the BEGIN command
is:
+----------+------------------------------------------------------------------+
| BEGIN    | [hexloc]                                                         |
+----------+------------------------------------------------------------------+
where:

hexloc   is the hexadecimal storage location where execution is to begin.


Usage notes:

1.  When BEGIN is issued without hexloc, execution begins at the storage
    address pointed to by the current virtual machine PSW.  Unless the PSW has
    been altered since the CP command mode was entered, the location stored in
    the PSW is the location where the virtual machine stopped.

2.  When BEGIN is issued with a storage location specified, execution begins at
    the specified storage location.  The specified address replaces the
    instruction address in the PSW, then the PSW is loaded.

3.  The execution of the BEGIN command will cause the console input buffer to
    return to the state it was in when the virtual machine stopped.