Homebrew receiver and IrDA option in BIOS

[Leonid K. <lka...@ma...>]

Hello,

I want to make homebrew serial reciever. On one site I found that after 
plugging such receiver I should change serial port mode in BIOS to IRDA. 
There is no such option in my BIOS. Is it necessary for any recievers?

And what difference betwean RX- and DCD-receivers?

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