Status Bytes; Tape Status Byte; Printer Status Bytes - IBM 5110 Maintenance Information Manual

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STATUS BYTES
The status bytes and their storage addresses for the various
I/O devices follow. If any operation is performed after the
error halt has occurred, the information contained in any
of these addresses might not be valid. All of the storage
addresses used can be viewed by switching to the DISPLAY
REGISTERS position.
Tape Status Byte
Storage Address OOBF
Bus in bit 0
23456 7
Printer Status Bytes
End of tape (EaT).
No device address E response.
Tape running.
Cartridge in place.
Erase on.
LED and erase OK.
File protected.
No beginning of tape (BOT).
Note:
The status bytes displayed are not the ones that
caused the error halt; they result from a sense command that
followed the error condition.
Status Byte A-Storage Address 0055
Bus in bit 0 1 2 3 4 5 6 7
Print emitter latch 3.
Print emitter latch 2.
Print emitter latch 1.
Wire check or not ready.
Forms emitter B.
Forms emitter A.
Not end of forms.
Left margin signal.
Service Aids 4-67