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Bit 5:
Direction control bit. When logic 1, the output buffers in the parallel port
are disabled allowing data driven from external sources to be read; when
logic 0
Bit 4:
A 1 in this position allows an interrupt to occur when ACK changes from low
state to high state.
Bit 3:
A 1 in this bit position selects the printer.
Bit 2:
A 0 starts the printer (50 microseconds pulse, minimum).
Bit 1:
A 1 causes the printer to line-feed after a line is printed.
Bit 0:
A 0.5 microsecond minimum highly active pulse clocks data into the printer.
Valid data must be present for a minimum of 0.5 microseconds before and
after the strobe pulse.
they work as a printer port. This bit is write-only.
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