At 05:37 PM 11/21/2010, Geraldo Netto wrote:
>Folks, a friend of mine wants to migrate from dos to freedos
>actually there are no issues by now, once he is just planning...
>but to make sure things will be okay, i'd like to ask
>what is the status of serial port support?

DOS doesn't not support any serial port, beside that it has the COMx: 
devices, which work by the ports as defined in the BIOS data segment

>how to use it?
>what if we have a rs-485 or rs-422 instead rs-232?

Certainly not a DOS issue, even BIOS know about RS-232 at best. 
RS-485 or RS-422 is completely application dependent, DOS knows 
nothing about those...


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