Acer 505 series - Manual (Page 74)

3 Peripherals and options 52
Connect the single connector end of the Y-bridge cable to the computer’s PS/2 port
and the double connector ends to the two PS/2 devices.
File transfer cable
Besides using the infrared port, you can also transfer files between computers
using a file transfer cable. Connect the file transfer cable between the parallel
ports of the two computers and use your file transfer utility to perform the transfer.