FILL IN THE ?????

ASAP

; Program to subtract a 2-byte signed number, nl, located at $1000-$1001 from a 2-byte number, n2, located at $1010-$1011. Store difference, diff, at $1020-$1021. ORG $1000 n1: DC.B $87, $12 ORG $1010 n2: DC.B $65, $34 ORG $1020 diff: DS.B ????? ;difference ORG $2000 n3: LDX ????? ;load X with address of first byte location of n2 n4: LDAA ????? ;load A with LSB byte of n2 n5: ???? n1+1 ;A