LoaderTest: integrate PS/2 keyboard in a simply way (good enough for Snake)
LoaderTest: integrate PS/2 keyboard in a simply way (good enough for Snake)

TODO:
- Add Ctrl/Alt/Del to reset system (now page up is abused)
- Detecting holding down of keys (so you can play Racer)

kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom