Signals
STROBE (Strobe) active low output
Notify the printer that data available on D0 o D7 are valid.
D0 - D7 (Data Bus) outputs Data byte send to the printer, output only in "compatible" mode and bi-directionnal in newer modes.
ACK (Acknoledge) active low input
Notify the computer that the printer is ready to receive the next data.
BUSY (Busy) active low input
Printer buffer full or printer busy, the computer must wait for this signal to get high again to continue sending data.
PE (Paper End) active high input
Printer out of paper.
SLCT (Select Out) active high input
Printer ready (On-line).
AUTO-FEED (Auto-Feed) active high output
Printer Line feed.
ERROR (Error) active low input
Error detected by the printer.
INIT (Reset) active low output
Initialize the printer (reset).
SLCT IN (Select In) active low output
Send a on-line request to the printer.
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