John La Rooy wrote:

> I thought by transparent, he meant that writing directly to the I/O ports
> should have an identical effect at the far end of the serial cable. 
> 
> I imagine there are legacy apps that say just let you specify com1 or
> com2 and then write directly to the I/O addresses. 

I don't think a WinXP application can do this. (The OP talked about WinXP.)

Gerhard

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