My 2-bit computer

A 2-bit computer with 8-bit addresses.

Instructions:
00 A B - Adds B into A
01 A - Swaps the bits of A
10 A - Shifts A left
11 A - Jumps to A

Controller (keys at 3 3 2 1, keys pressed at 3 3 3 0) (only 3 pressed at a time):
00 - Down
01 - Right
10 - Left
11 - Up

Output (at 3 3 3 3):
00 - Nothing
01 - Newline
10 - Backspace
11 - Something