; PRINT ENTIRE OF CODE PAGE 437 TO THE SCREEN; (NASM Source)_start:    ; Set to 0    xor ax, ax    xor bx, bx    xor cx, cx    xor dx, dx    mov ah, 0x5 ; Select active display page al    mov al, 1    int 0x10    mov bh, 1   ; Page number    mov ah, 0x2 ; Set cursor position to (dl, dh)    int 0x10    xor ax, ax    ; For each character (0-255)    loop:        mov ah, 0xa ; Write character al at cursor position        mov cx, 1   ; Write only once        int 0x10        inc dl      ; x++        ; Create a newline every 32 characters        test dl, 0x1f   ; if dl & 0x1f == 0        jnz nonewline            inc dh      ; y++            xor dl, dl  ; x = 0        nonewline:        mov ah, 0x2 ; Set cursor position to (dl, dh)        int 0x10        inc al      ; al++        test al, al ; if al != 0 goto loop        jnz loophang:    jmp hang; Count up size of each section%assign text_length ($-$$); Pad the boot sector out to 512 bytes; All bytes are padded with nop, except the last to (0x55 0xaa).times 510 - text_length nopdb 0x55, 0xaa