Question

Write ALP to clear Register ,B, if number at memory location 20F9H is Palindrome; otherwise store FFH in Register B.

[Palindrome No. Ex. FF, 22, AA]

Answer 1

Mnemonics		Comment
Opcode	Operand
LIX H, 20F9H		; Store 20F9 in HL pair
MOV A, M		; Copy memory data to Acc
ANI OF		; Logically And Acc. with 0F
MOV B, A		; Copy Acc. to B Reg
MOV A, M		; Copy memory content to Acc
ANI F0		; Logically And Acc. with F0
RRC		; Rotate digits
RRC		; Rotate digits
RRC		; Rotate digits
RRC		; Rotate digits
CMP B		; Compare Acc. with B reg
JNZ : NEXT		; If A ? B; go to next
MVI B, 00		; Store 00 in B reg.
RST 1.0		; Restart.
NEXT : MVI B, FF		; Store FF in B reg.
RST 1.0		; Restart.