VGA_ATR_ENB_PLT
PUTB(reg, VGA_ATR_AD, VGA_ATR_ENB_PLT);
PUTB(reg, VGA_ATR_AD, VGA_ATR_ENB_PLT);
outb(VGA_REG_ADDR + VGA_ATR_AD, VGA_ATR_ENB_PLT);
outb(VGA_REG_ADDR + VGA_ATR_AD, VGA_ATR_ENB_PLT);