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This is a very ODD switch box, it allows one non usb computer with standard LPT DB-25 port to connect into a Standard LPT port Printer with DB 25-port, but on the B port it converts a NONE LPT port to a standard LPT-DB-25 port from a computer that has no LPT DB-25 Ports!
Please see image if you are confused (like we are)
Two-Way printer switch. Manual. Also called A-B data switch. Parallel port.
Important Technical Information:
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DUAL PORT USB to Serial RS-232 DB-9 Adapter Cable from $39.98
