I have a Logitech 250 keyboard with a PS/2 connector and would like to connect it to a USB port on my laptop. I bought a keyboard PS/2 to USB adapter, but it did not work. So, I bought a combined keyboard/mouse PS/2 to USB adpater and this did work. I no longer have it and it was quite bulky. So, I bought a USB plug, cut the PS/2 connector off the cable and carefully soldered the USB plug in its place. I checked the colour coding of the wires inside the keyboard: Vcc + is red, Data 1 is yellow, Data 2 is green, 0 v is white and Screen is black. I looked up the USB pin outs on Wikipedia and made sure that the Vcc and O v wires were in the correct positions on the USB plug by carefully metering the pins on the laptop USB port. I tried connecting the yellow wire to pin 2 and green wire to pin 3 on the USB plug and the reverse, but neither worked. Logitech support offered me a discount on a USB keyboard, but I'm intrigued to know why it does not work, when the combined keyboard/mouse PS/2 to USB adpater did work. Can anyone enlighten me and hopefully tell me how to make it work?