Nagasaki PC104-688VL, User Manual

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NAGASAKI IPC
64
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, they work as a printer port. This bit is write-only.
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.