interrupt-handler

MOV ACC, DOWN   | MOV ACC, DOWN   | MOV ACC, DOWN   | MOV ACC, DOWN   |
MOV UP, ACC     | MOV UP, ACC     | MOV UP, ACC     | MOV UP, ACC     |
MOV ACC, DOWN   | MOV ACC, DOWN   | MOV ACC, DOWN   | MOV ACC, DOWN   |
________________|_________________|_________________|_________________|
MOV UP, ACC     | MOV UP, ACC     | MOV UP, ACC     | MOV UP, ACC     |
SUB UP          | SUB UP          | SUB UP          | SUB UP          |
JLZ Y           | JLZ Y           | JLZ Y           | JLZ Y           |
MOV 0, RIGHT    | MOV LEFT, RIGHT | MOV LEFT, RIGHT | MOV LEFT, DOWN  |
JMP END         | JMP END         | JMP END         | JMP END         |
Y: MOV 1, RIGHT | Y: MOV 2, RIGHT | Y: MOV 3, RIGHT | Y: MOV 4, DOWN  |
END: MOV 0, ACC | MOV LEFT, NIL   | MOV LEFT, NIL   | MOV LEFT, NIL   |
                | END:MOV 0, ACC  | END:MOV 0, ACC  | END:MOV 0, ACC  |
_______________ |_________________|_________________|_________________|
COMMUNICATION   |                 | MOV RIGHT, DOWN | MOV UP, LEFT    |
FAILURE         |                 |                 |                 |
________________|_________________|_________________|_________________|