GameBoy\Cbopcode::cbopcode42 PHP Method

    private static function cbopcode42(Core $core)
    {
        $core->FCarry = ($core->registerD & 0x1) == 0x1;
        $core->registerD = ($core->registerD & 0x80) + ($core->registerD >> 1);
        $core->FHalfCarry = $core->FSubtract = false;
        $core->FZero = $core->registerD == 0;
    }