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Internet Message Format  |  1992-11-19  |  839 b 
  1. Xref: sparky comp.os.msdos.programmer:10784 comp.sys.ibm.pc.programmer:596
  2. Newsgroups: comp.os.msdos.programmer,comp.sys.ibm.pc.programmer
  3. Path: sparky!uunet!seas.gwu.edu!ilan
  4. From: ilan@seas.gwu.edu (Ilan Berkner)
  5. Subject: Re: H E L P!!! Serial Communications Blues... (UART).
  6. Message-ID: <1992Nov20.010747.19660@seas.gwu.edu>
  7. Sender: news@seas.gwu.edu
  8. Organization: George Washington University
  9. References: <1992Nov19.143345.9313@iccgcc.decnet.ab.com>
  10. Date: Fri, 20 Nov 1992 01:07:47 GMT
  11. Lines: 5
  12.  
  13. The UART will only signal an receive-interrupt when it has received data
  14. from the outside, not the inside!  You must have a cable attached to
  15. COM2 that runs from either COM1 or from another computer.  Sending data
  16. to COM2 will not trigger a receive interrupt, since the UART hasn't
  17. received anything!  It's transmitting something instead.
  18.