I want to build a keyboard for the PC, but without the matrix layout of the
common PC keyboards, I want to asign each key to different pins, so I don't
have the limitation that I cannot press a lot of keys at once. I only need
20 or so keys, so it should be fine with an 8051.
Do you know were I can find code and diagrams for this?, or to a normal
keyboard so I can modify it?, otherwise, any information about how it works
to build it myself?
Thank you.

Francisco