>
>
> Unfortunately, the IIfx created some compatibility problems with
> software that, contrary to Apple?s recommendations, accessed
> hardware (such as serial ports or the disk controller) directly. A
> "IIfx Serial Switch" Control Panel alleviated the difficulties for
> applications and utilities that wanted to talk directly to the
> serial ports instead of working with the drivers, but other
> incompatibilities had to be ironed out by the application
> developers.
>
>