Honeywell 400 Series Hardware Manual page 23

Channel Busy
Channel Absent
Channel Alert (R)
CARD READER INSTRUCTIONS
The General Electric card readers are capable of executing both Operational and non-
operational instructions. A 6-bit operation code in the instruction informs the reader
of the operation to be performed.
Operation
Code Function
000000 Sends the code for the existing status of the
subsystem to the processing system.
000001 Reads one card in the binary mode.
000010 Reads one card in the alphanumeric mode.
000011 ' Reads one card in the mixed mode.
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