d stop_trap 0
d stop_spa 0
d 4 400
d 6 4
d 10 500
d 12 10
d -m 400 cmp -(sp),-(sp)
d -m 402 halt
d -m 404 rti
d -m 500 halt
d -m 502 rti
d -m 1000 clr SP
d 1002 10
d -m 1004 halt
g 1000
e ksp
e 0-2
c
e ksp
e 0-2
c
e ksp
e 0-2
c
e ksp
e 0-2
c