additional information from my questions above:
in FoxPro DOS ver.2.6 under DOS 6.22:
SET PRINTER TO COM1|2] can not work, why? Whilst we can do smoothly TO LPT1 or LPT2.
And I am sure there is no hardware problems since I can print either to Com1 or LPT1 from other applications (other than foxpro DOS 2.6) under windows 3.11 operating system or dos 6.22
Well it's been a long time since I ran strictly under 6.22, but I believe the key with using either of the COM ports, is to make sure you use the MODE statement to properly configure the port to match the baud rate, parity, etc. of the device you have attached. Other programs may explicitly set/reset these settings.
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