Separate the following Centronics printer port signals into those originating at the computer and those coming out from the printer: STROBE, ERROR, SELECT, AUTO_FEED, OUT_OF_PAPER, BUSY, SELECT_INPUT,...

Separate the following Centronics printer port signals into those originating at the computer and those coming out from the printer:

STROBE, ERROR, SELECT, AUTO_FEED, OUT_OF_PAPER, BUSY, SELECT_INPUT, INT, ACK

How many of them are really essential? Describe the handshake exchange that takes place as each byte is transferred.