IBM 3279 2A Maintenance Information page 110

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3279 MIM
Base sym bois are selected.
Program Symbols Set A is selected.
Reverse Video.
Blink.
Underscore.
Normal.
Color in effect is shown by colored blob .
Color is green or white by default.
Keyboard is in numeric mode (0123456789 -. and DUP only).
The keyboard is in APL mode.
The keyboard is in text mode.
The keyboard is in upshift.
The 3279 is in insert mode. (This symbol appears in position 41 on Model A or
position 42 on Model B.)
When printer IO/class is changed. two keyed-in numerals appear
here.
Authorization to use printer nn.
Selected printer is printing your work.
Selected printer stopped while printing for this 3279.
Printer assignment for this 3279 has changed.
Appendix A. Indicators in Operator Information Area A-3