IBM 1220 - Manual (Page 90)

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Network Card
Busy
What this message means:
An internal print server (also called an internal network adapter or INA) is being reset.
What you can do:
Wait for the message to clear.
Network
What this message means:
A network interface is the active communication link.
Network ,
What this message means:
A network interface is the active communication link, where represents the active
communication link and represents the channel.
No DRAM Installed
What this message means:
No DRAM is installed in the printer.
What you can do:
Turn the printer off, install DRAM and turn the printer back on.