For a one-off/temporary situation, I might wire up a breakout box and leave it in place. But a breakout box like this one:Ĭan help figure out pretty much any combination of port pin configurations. When the connection is between two similar machines (e.g., any two PC-type systems with standard 9-pin ports) then a null modem cable will (mostly.) do the trick. The minimum is transmit, receive and ground, but you will need more if you use hardware handshaking. Handshaking is the tricky part - set it as best as you can and then deal with the problems (more below). Parity will almost always be None for DOS printers, though other settings are possible. Speed and parity are easy - typically 9600 bps or 19200 bps for a DOS printer, and very easy to configure in DOS (not so easy in some older systems.) and Linux. With serial ports (this is RS-232C and similar, not USB), the key parameters are speed, parity and handshaking.
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