IBM 1220 - Manual (Page 95)

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Prog Engine Code
What this message means:
The printer is programming new code into the flash memory.
What you can do:
Wait for the message to clear.
W ARNING : Do not turn the printer off while this message is displayed.
Prog System Code
What this message means:
The printer is programming new system code.
What you can do:
Wait for the message to clear and the printer to reset.
W ARNING : Do not turn the printer off while this message is displayed.
Program Flash
What this message means:
The printer is storing resources, such as fonts or macros, in flash memory.
What you can do:
Wait for the message to clear.
W ARNING : Do not turn the printer off while this message is displayed.
Programming Disk
What this message means:
The printer is storing resources, such as fonts or macros, on the hard disk.
What you can do:
Wait for the message to clear.
W ARNING : Do not turn the printer off while this message is displayed.