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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!snorkelwacker.mit.edu!thunder.mcrcim.mcgill.edu!homer.cs.mcgill.ca!uriel!storm
- From: storm@uriel (Marc WANDSCHNEIDER)
- Subject: Re: Why does my PC sometimes hang when the phone rings?
- Message-ID: <1992Sep13.004924.7147@cs.mcgill.ca>
- Sender: news@cs.mcgill.ca (Netnews Administrator)
- Organization: SOCS, McGill University, Montreal, Canada
- References: <18rt4rINN7s2@agate.berkeley.edu> <1992Sep12.104745.13585@csx.cciw.ca>
- Date: Sun, 13 Sep 1992 00:49:24 GMT
- Lines: 39
-
- In article <1992Sep12.104745.13585@csx.cciw.ca> u009@csx.cciw.ca (G. Stewart Beal) writes:
- >In article <18rt4rINN7s2@agate.berkeley.edu> stanton@haas.berkeley.edu (Richard Stanton) writes:
- >>Earlier today, I had been using MS-KERMIT to dial in to a computer.
- >>I logged off, hung up, and exited. A little while later (while in the
- >>middle of another program, unrelated to serial communications), the
- >>phone rang and my PC completely froze, requiring a hard reboot.
- >>
- >Your communications program is leaving the interrupt vector set to it's
- >own code and not restoring it when it exits. When the phone rings, the
- >modem is probably sending "RING" along the data lines and/or raising
- >the RING line - pin 22 - and possibly DTR -pin 20- to the computer.
- >The machine sees the data, or the control line delta and generates an
- >interrupt to alert the non-existant software. BINGO.
- >A possible solution is to reboot your machine, or only shell out to DOS
- >rather than exiting. Another possibility is to load a mouse driver
- >after you are finished. Specify the same serial port you use for the
- >modem. This may work if the driver will load without a physical mouse
- >present
- >Lastly, check to see if another program (like TELIX) might work as well
- >as your current one. I haven't had any similar problems with TELIX so
- >I assume it resets the interrupt correctly.
-
- I would personally NOT recommend using TELIX if this is happening.
-
- I discoverd last year with my internal modem, that if I left Telix
- running in a DOS box under windows 3.x, the computer would reboot every time
- somebody phoned and the modem sent a RING.
-
- I no longer have this problem with my external 14,4 SupraFax modem.
-
- Toodlepip!
-
- Marc 'em.
-
- --
- storm@cs.mcgill.ca McGill University C program run. Run
- Marc Wandschneider Montreal, CANADA Program run! PLEASE!
- "When 900 years old you reach, look as good you will not." - Yoda
- "Ow!" -J.F.K.~
-