GameBoy\Opcode::opcode4 PHP Method

    public static function opcode4(Core $core)
    {
        $core->registerB = $core->registerB + 1 & 0xff;
        $core->FZero = $core->registerB == 0;
        $core->FHalfCarry = ($core->registerB & 0xf) == 0;
        $core->FSubtract = false;
    }