Help me debug

Question

ORG. $1000
START; FIRST INSTRUCTION OF PROGRAM
* PUT PROGRAM CODE HERE
MOVE # BREATH,D3
MOVE # HEIGHT,D2
MOVE # WIDTH,D4
MULU D2,D3
MULU D4,D3
MOVE BD3,DI
MOVE.L #3,D0
TRAP # 15

BREATH EQU 6
HEIGHT EQU 2
WIDTH EQU 8
SIMHALT
*PUT VARIABLE QND CONSTANT HERE
END START

Answer 1

what architecture is that? and what operating system?