Question

Write an Assembly Language Program to count the occurrence of the data byte ACH in a memory Nock stored from 7401H to 7405H. Store the count at the memory location 7406H.

Answer 1

Label	Mnemonic + Operand	Comments
START:     LOOP:       NEXT:         END:	MVI C, 05H MVI B, 00H LXI H, 7401H MOV A, M CPI ACH JNZ NEXT INR B INX H DCR C JNZ LOOP MOV A, B STA 7406H RST 1.0	; Store count 05H in register C ; Initialize occurrence count in register B ; Initialize H-L pair with starting address ; Get the number in the accumulator ; Check whether the number in the accumulator is ACH ; If no? jump to label NEXT ; Yes, increment content in register B by 1 ; Increment H-L pair ; Decrement count ; Is count zero? No-jump to label LOOP ; Get count in accumulator ; Store count of occurrence 7406H ; Restart