Write an x86 assembly program that:
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.
This is a possible solution:
section .data
number db 11001100b ; arbitrary number with parity even
section .text
global _start
_start:
mov al, byte [number] ; load AL with the arbitrary number
test al, 1 ; check parity by testing the lowest bit
jpe even ; jump if parity even
mov al, 01h ; set AL to 01H if parity odd
jmp send ; jump to send the value to Port 0
even:
mov al, 80h ; set AL to 80H if parity even
send:
out 0, al ; transfer the value in AL to Port 0
mov eax, 1 ; prepare to exit the program
xor ebx, ebx ; set the return code to zero
int 0x80 ; invoke the kernel to exit
Certainly! Here's an example of an x86 assembly program that achieves the desired functionality:
```assembly
section .text
global _start
_start:
; Load arbitrary number into AL
mov al, 5 ; Replace 5 with your desired number
; Check if the parity is even or odd
xor ah, ah ; Clear AH register
mov cl, 7 ; Initialize count to 7
parity_loop:
shr al, 1 ; Shift AL to the right
adc ah, 0 ; Add the least significant bit to AH
loop parity_loop ; Repeat until count is zero
; Check the parity result and transfer data to Port 0 accordingly
mov dx, 0x3F8 ; Replace 0x3F8 with the desired port address
test ah, 0x1 ; Check the least significant bit of AH
jz even_parity ; Jump to even_parity if the result is zero
jmp odd_parity ; Jump to odd_parity otherwise
even_parity:
mov al, 0x80 ; Even parity: transfer 80H to Port 0
jmp write_port
odd_parity:
mov al, 0x01 ; Odd parity: transfer 01H to Port 0
write_port:
out dx, al ; Write the data in AL to the specified port
; Exit the program
mov eax, 1 ; System call number for exit
xor ebx, ebx ; Exit status 0
int 0x80 ; Make the system call
section .bss
; Declare any necessary variables here
```
Please note that in the program above, the arbitrary number is set to 5 (mov al, 5). You can replace this value with your desired number. Additionally, the program assumes that the port address is 0x3F8. Make sure to replace this value with the correct port address you want to use.
Let me know if you have any more questions!