Ps2

The way the PS/2 keyboard is handled has always been something we were never quite happy with. The key points being:

• The PS/2 controller had no way of signalling that there has been a new keystroke, the buffer had to be polled via SPI.
• The PS/2 controller had no way of talking to the keyboard and had to rely for the keyboard to initialize itself properly. Also, typematic rate and delay could not be set, as couldn’t the states of the keyboard LEDs.

Although mid- to long term, we likely might “upgrade” to USB anyway, but not without having done PS/2 right first. So, I will talk about integrating IRQ handling, and in a follow up post Marko will talk about how he got the PS/2 controller talking to the keyboard.