4 Pin Ps2

[tobr1an]

I recently got a really old keyboard from my friend and it contain white alps. The adapter is 4 pin ps/2 I believe. Is there anyway to convert this 4 pin into USB?

[mbc]

An active converter like the blue cube..

[kishy]

Although PS/2 only actually uses 4 pins, the connector has 6 positions and often they all have pins present.

What type of keyboard is it? ADB, Apple Desktop Bus for older Macs, also has 4 pins.

[tobr1an]

Although PS/2 only actually uses 4 pins, the connector has 6 positions and often they all have pins present.

What type of keyboard is it? ADB, Apple Desktop Bus for older Macs, also has 4 pins.

I really don't know what kind of keyboard it is as I do not see any brand on it what so ever. On the back of the keyboard it say Micro Warehouse, Inc. Model No. Power User 105.

[Findecanor]

The "Micro Warehouse, Inc. Power User 105" should be a keyboard for the old Macintosh which speaks the "Apple Desktop Bus" (ADB) protocol.
I had one, here are pictures I took of mine (before I stripped it for parts and put them into my Dell AT101W). Mine had Swedish layout, though.

You need a ADB to USB converter to connect it to a modern computer. Unfortunately, there are not as many of them as there as PS/2 to USB converters.  The only commercial converter that I know of is the "Belkin iMate", which is not always that easy to find.
If you have some skills with soldering circuits, then you could build one yourself: Get a Teensy USB Development Board, connect the wires and/or ports to it and load Hasu's ADB to USB keyboard Converter for Teensy on it.