ASUS 90NB0601-R31BG0, Keyboard, Bulgarian, ASUS, - Asus Notebook X Series X751LN - Asus Notebook X Series X751MA - Asus Notebook X Series X751MD ASUS 90NB0601-R31BG0. Type: Keyboard. Keyboard language: Bulgarian. Brand compatibility: ASUS, Compatibility: - Asus Notebook X Series X751LN - Asus Notebook X Series X751MA - Asus Notebook X Series X751MD