First step was to map out the power supply and keyboard connectors.
![](https://cdn.hackaday.io/images/2088291663907020900.jpg)
The power connector for the original hard drive is a 4-pin molex, and provides both 5V and 12V, which is suitable for the Pi and the screen respectively.
The keyboard is a standard AT style and maps directly to PS/2. A PS/2 to USB adapter and some wiring allows us to plug the keyboard directly into the Pi.
![](https://cdn.hackaday.io/images/7113031663907179889.jpg)