Write an assembly program that will:
Load AL by an arbitrary number, if there is parity even, transfer 80H to the Port 0, and if there is parity odd, transfer 01H to the Port 0.
Here is one possible solution in x86 assembly language:
section .text
global _start
_start:
; Load AL with an arbitrary number
mov al, 0b01101010 ; Example: load AL with 6Ch (1101100b)
; Check the parity of AL
mov ah, 0 ; Clear AH to use for parity calculation
xor edx, edx ; Clear EDX for division by 2
mov dl, al ; Copy AL to DL for division by 2
shr dl, 1 ; Divide by 2 (shift right)
jnb even ; Jump if no carry (even parity)
; Odd parity
mov al, 1 ; Set AL to 01h
jmp output ; Jump to output
even:
; Even parity
mov al, 0x80 ; Set AL to 80h
output:
; Transfer AL to Port 0 (OUT 0, AL)
mov dx, 0x0000 ; Set DX to Port 0 address
out dx, al ; Transfer AL to Port 0
; Exit program
mov eax, 1 ; Set exit code to 1
xor ebx, ebx ; Clear EBX for compatibility
int 0x80 ; Invoke system call for exit
Sure! Here's an example of an assembly program that performs the described task:
```assembly
ORG 100h
START:
MOV AH, 00h ; Set up for input
MOV AL, 48h ; Arbitrary number (change to any desired value)
MOV BL, 80h ; Set port value for even parity
MOV BH, 01h ; Set port value for odd parity
MOV BX, AX ; Copy the number from AL into BX
XOR CX, CX ; Initialize CX to 0 for keeping track of the number of set bits
CHECK_PARITY_LOOP:
SHR BX, 1 ; Shift right BX by one bit
JC COUNT_SET_BITS
LOOP CHECK_PARITY_LOOP
CMP CX, 00h ; Check if CX is 0
JZ EVEN_PARITY
; Odd parity case
MOV AL, BH ; Load AL with 01h
OUT 00h, AL ; Transfer AL value to Port 0
JMP END_PROG ; End the program
COUNT_SET_BITS:
INC CX ; Increment CX when a set bit is found
JMP SHORT CHECK_PARITY_LOOP
EVEN_PARITY:
; Even parity case
MOV AL, BL ; Load AL with 80h
OUT 00h, AL ; Transfer AL value to Port 0
END_PROG:
MOV AH, 4Ch ; Terminate program
INT 21h
```
Please keep in mind that this program assumes a particular system architecture and OS conventions for executing assembly programs, so you may need to adapt it to your specific environment.