What would it work if i plugged an A1200 keyboard into this (pre interface?) board?
It'll work just fine (did for me at least, it may depend on the A500 revision). Note however that the board will be located akwardly in the middle of the keyboard. I worked around this by swapping the key membrane inside the keyboard (take out the A1200 one, put in the A500 one). Thus I could locate the board to it's usual place.
And if so would i be able to use an A1200T keyboard adaptor?
Depends on the adaptor. If it connects to the CLK, DAT, +5V and GND it'd be much easier to just wire it to the correct locations on the motherboard directly.
