ASM-EXP5

05.asm

; TESTED ON MASM
; REF:  http://www.computing.dcu.ie/~ray/teaching/CA296/notes/8086_bios_and_dos_interrupts.html#int10h_13h

assume cs:codesg
codesg segment

mov al, 1       ;string contains attibutes
mov bh, 0       ;set to page 0
mov bl, 01001111b       ;set foreground color == red, background color == white
mov cx, msg1end - offset msg1   ; calculate message size, not include attributes
mov dl, 10              ;write start at column
mov dh, 7               ;write start at line
push cs                 ;save current program addr to stack
pop es                  ;load this program to es and make it start here
mov bp, offset msg1     ;points to the string
mov ah, 13h             ;set mode - write string
int 10h                 ;do print
jmp msg1end             

msg1 db "Hello world"
msg1end:
    mov ax,4c00h
    int 21h
    
codesg ends
end

05.s

;TESTED ON NASM

    org 0x7c00
    bits 16

    xor ax, ax
    mov es, ax
    mov bh, 0
    mov bp, msg

    mov ah, 0x13
    mov bl, [colors]
    mov al, 1
    mov cx, [msg_length]
    mov dh, [msg_y]
    mov dl, [msg_x]

    int 0x10

    jmp $

    colors dw 0x4F
    msg db ' hello world '
    msg_length dw $-msg
    msg_x dw 10
    msg_y dw 7

    times  510 - ($-$$) db 0
    dw 0xAA55