Service manual

Firmware Updates D-23
In the event that your emulator appears hung, it is possible that the COM1 port
is jammed. The procedure presented in Example D–9 will clear the jam. Of
course, communications could have failed for some other reason that you will
have to investigate if this procedure does not work.
From the emulator’s perspective, it has received an XOFF. Setting the
CLEAR COMM sets XON and the emulator will again transmit the
characters you type.
The escape sequence gets you to the SCM.
The clear port command clears the COM1 port enabling it to receive
characters from the emulator.
The quit command takes you out of the SCM console monitor and will
bring you back to whatever you were running before the jam occurred.
You are brought back either to the SRM console to the operating system.
You may have to hit carriage return before the prompt comes back.