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serial.txt
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1994-05-03
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2KB
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65 lines
Introduction
When you use Windows for Workgroups version 3.11 with serial
communications software, you may experience the following problems:
- If you are using a Pentium(TM)-based machine with a 16550 UART chip,
your system stops responding (hangs) if there is data in the chip
when the serial communications application attempts to open the
communications port.
A problem with the 16550 UART implementation causes the chip to
become trapped in a mode in which data is always detected in its
FIFO buffer.
- When you are using communications software, you may be able to make
one connection after starting Windows for Workgroups, but any
subsequent connections fail and may hang your system.
This problem occurs when SERIAL.386 sends an extra NUL character
through the port when the communications software calls the
CloseComm application program interface (API) function. While this
does not normally cause problems, your second connection may fail
with some modems.
The WG1001 disk included with this Application Note contains an
updated SERIAL.386 driver that corrects both of these problems.
To install the updated SERIAL.386 file
--------------------------------------
1. Quit Windows for Workgroups.
2. Make a backup copy of the currently installed SERIAL.386 file by
typing the following at the MS-DOS command prompt and then pressing
ENTER
ren <drive>:<path>\serial.386 serial.old
where <drive>:<path> is the location of your Windows SYSTEM
subdirectory.
For example, if your Windows directory is called WINDOWS and is on
drive C, type the following at the MS-DOS command prompt and then
press ENTER:
ren c:\windows\system\serial.386 serial.old
3. Insert the enclosed WG1001 disk in the appropriate floppy disk
drive.
4. To copy the file to the Windows SYSTEM subdirectory, type the
following at the MS-DOS command prompt and then press ENTER
copy <drive>:\serial.386 <destination>
where <drive> is the floppy disk drive containing the WG1001 disk
and <destination> is the drive and directory of your Windows SYSTEM
subdirectory.
For example, if the WG1001 disk is in drive A and your Windows
directory is called WINDOWS and is on drive C, type the following
at the MS-DOS command prompt and then press ENTER:
copy a:\serial.386 c:\windows\system