GameBoy\Cbopcode::cbopcode39 PHP Method

    private static function cbopcode39(Core $core)
    {
        $core->FCarry = ($core->registerA & 0x80) == 0x80;
        $core->registerA = $core->registerA << 1 & 0xff;
        $core->FHalfCarry = $core->FSubtract = false;
        $core->FZero = $core->registerA == 0x0;
    }