Make beep sound in BIOS

Question

When computer starts to boot, It makes a beep sound from the BIOS Speaker .

How do i can do this in Assembly or C++ ? Clearly I want to make Beep Sound by BIOS Speaker.
Remember i mean BIOS Speakers

Does it have any interrupt for that ? I searched about that but nothing found.. I used some interrupt But the didn't do this. the following code :

int main(){
   cout<<"\a";
}

Produced the sound from the Speaker, Not Bios

How can i do this ? with any interrupt ?

Answer 1

Try to add this code, too.

.pause1:
    mov     cx, 65535
.pause2:
    dec     cx
    jne     .pause2
    dec     bx
    jne     .pause1
    in      al, 61h         ; Turn off note (get value from
                            ;  port 61h).
    and     al, 11111100b   ; Reset bits 1 and 0.
    out     61h, al         ; Send new value.

So, the result is:

void beep(){

    __asm{

      MOV al, 182         ; Prepare the speaker for the
      out     43h, al     ;  note.
      mov     ax, 2280    ; Frequency number (in decimal)
                          ;  for C.
      out     42h, al     ; Output low byte.
      mov     al, ah      ; Output high byte.
      out     42h, al 
      in      al, 61h     ; Turn on note (get value from
                          ;  port 61h).
      or      al, 00000011b   ; Set bits 1 and 0.
      out     61h, al         ; Send new value.
      mov     bx, 4       ; Pause for duration of note.


    .pause1:
       mov     cx, 65535
    .pause2:
       dec     cx
       jne     .pause2
       dec     bx
       jne     .pause1
       in      al, 61h         ; Turn off note (get value from
                               ;  port 61h).
       and     al, 11111100b   ; Reset bits 1 and 0.
       out     61h, al         ; Send new value.

   };
}

Answer 2

The only way you can implement this in any modern Windows OS is, I guess, writing Kernel Mode driver. The reason is that in or out instructions are not available in user mode, and there is no API for beeper available.

• http://en.wikipedia.org/wiki/Protection_ring
• https://msdn.microsoft.com/en-us/library/windows/hardware/ff554836(v=vs.85).aspx

However, if you're just willing to dig into low-level programming, consider writing own bootloader or even own BIOS (using virtual machine).

Answer 3

Try to include this procedure in your C++ program.

void beep(){

    __asm{

      MOV al, 182         ; Prepare the speaker for the
      out     43h, al     ;  note.
      mov     ax, 2280    ; Frequency number (in decimal)
                          ;  for C.
      out     42h, al     ; Output low byte.
      mov     al, ah      ; Output high byte.
      out     42h, al 
      in      al, 61h     ; Turn on note (get value from
                          ;  port 61h).
      or      al, 00000011b   ; Set bits 1 and 0.
      out     61h, al         ; Send new value.
      mov     bx, 4       ; Pause for duration of note.
   };
}