PIC16F84 AT Keyboard Interface
Sometimes you only need a simple and cheap RS232 terminal to get sufficient control over a PC or a RS232 device. There is no need, no space or even no power to place a monitor, a computer case and a keyboard. Maybe there exists also the problem, that the PC or the device is located somewhere else and you want to interact with it over a short distance.The cheapest way to obtain a complete user interface is the use of standard components, such as LCD modules and PC keyboards.
   AT Keyboard Interface
Check out AT Keyboard Interface website
www.trash.net