Question

Write ALP to multiply number stored at 8085H by 09H and store result at 8086H and 8087H, with lower byte at 8086H.

Answer 1

Mnemonics		Comment
Opcode	Operand
MVI A, 00		; Store 00 to Acc
MOV D, A		; Store 00 to D Reg
LXI H, 8085		; Reg 8085 in HL pair
MOV B, M		; store content of Memory to B Reg
MVI C, 09		; Store count in C Register
BACK: ADD B		; Addition of B reg with Acc.
JNC : NEXT		; Increment D Reg. by 1
INR D		; Decrement counter by 1
NEXT : DCR C		; Decrement counter by 1
JNZ : BACK		; Jump C ? 0; go to Back
INX H		; Increment HL pair by 1
MOV M, A		; Result stored from Acc. to memory
INX H		; Increment HL pair by 1
MOV M, D		; Store D reg to memory
RST 1.0		; Restart.