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Index > OS Construction > reading user input by bios functions

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Saveriokarol



Joined: 21 Sep 2022
Posts: 1
Saveriokarol
Hello, Im Saveriokarol but i dont know how to read user input. Im doing for a command line os. Anyone help me with an example.
Post 21 Sep 2022, 15:09
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macomics



Joined: 26 Jan 2021
Posts: 652
Location: Russia
macomics
What kind of user input exactly?
Keyboard:
Code:
    mov ah, 0 ; 88-key keyboard
    int 22 ; al = ascii code, ah = scancode
; or
    mov ah, 16 ; extended
    int 22 ; al = ascii code, ah = scancode    


COM:
Code:
    mov ah, 0 ; initialize
    mov al, 11100011b ; 9600 boud / no parity / 8-bit sequence + 1-bit stop
    mov dx, COM_NUMBER ; 0 - 3
    int 20 ; al = model status, ah = line status
; and then
    mov ah, 3 ; receive
    mov dx, COM_NUMBER ; 0 - 3
    int 20 ; al = byte, ah = line status    

Mouse:
Code:
    mov ax, 0xC200 ; activate / deactivate
    mov bh, 1 ; activate
    int 21 ; cf = error, al = status
; and then
    mov word [cs:callback_proc + 2], cs
    mov ax, 0xC207 ; setup callback
    les bx, [callback_proc]
    int 21 ; cf = error
; callback ptotype
mouse_callback:
  virtual at bp + 6
    .state dw ?
    .X     dw ?
    .Y     dw ?
    .flags dw ? ; always zero (reserved)
  end virtual
    push bp
    mov bp, sp

    leave
    retf
callback_proc dd mouse_callback and 0xFFFF    
Post 21 Sep 2022, 19:15
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