Dial-Up Networking with Windows 3.1 (3.x)
High Speed Modem Connections & PSI Remote Access
(Windows/External Modem)
I.
You must connect to a V.34 PSI Remote Access POP to use V.42bis
& MNP5 Compression...
II.
16550 UARTs: . . . UART is short for "Universal Asyncronous Receiver
- Transmitter". All serial devices, such as serial modems,
use a UART interface chip to communicate with your PC. External modems
connect to your PC using a serial cable hooked to one of your PC's
UART-based serial ports, while internal modems have a UART-based serial
port on-board. It is important that you know a little about UARTs in
order to avoid problems in setting up your system to efficiently
use your modem. Basically, UARTs convert parallel data from your
computer into a serial data stream, and vice-versa. Most serial ports
that come with PC's (especially non-Pentium systems) have a 8250 or
a 16450 UART. While these chips are capable of passing data at
rates much higher than is necessary to keep a 28.8 modem busy, they
have only a single character buffer and lack onboard flow-control.
The problem is that on many systems Windows may not be able to fetch
characters from the UART fast enough to prevent the next incoming
character from overwriting the single-character buffer, resulting
in a "comm overrun" or "CRC" error.
Run MSD.EXE, the Microsoft diagnostic program which comes with current
releases of both DOS and Windows (use the one with the newest file date)
, to see if you have a 16550 UART. EXIT Windows before running, as executing
MSD in a DOS window can give bogus results. If MSD shows you don't have
a 16550 variety of UART, you should upgrade your serial port hardware.
You can buy a new serial card which contains a 16550 UART for about $30
plus or minus. Look for UARTs labeled 16550A, 16550AF, or 16550AFN;
some of the early chips with just "16550" had problems.
III.
Download & Install CyberCom...This is for Windows 3.1 or 3.11 ONLY!
CyberCom is a direct replacement for the standard Windows
Communications Driver (COMM.DRV).
* Transfer at up to 115,200 KB with a 16550 serial port chip
* Great for V.FAST and Voice modems that require 57,600 Kb
* More reliable Transfer with less overhead on your system - Better
background operation.
* Fewer (if any) over/under runs.
FTP locations for CyberCom (cybercom.drv or cybercom.zip)
username: anonymous
password: account#@psinet.com
transfer: binary
ftp.simtel.com
/SimTel/win3/commprog
ftp.cc.utexas.edu
/microlib/win/drivers/comm
nic.switch.ch
/mirror/simtel/win3/commprog
Installation Instructions
1. Copy CYBERCOM.DRV into your Windows\System directory.
Edit the Windows\SYSTEM.INI file and change the following line:
From comm.drv=comm.drv
To comm.drv=cybercom.drv
2. If you previously have not taken advantage of the 16550 installed
in your computer then ensure that the Windows\SYSTEM.INI file has the
following information:
[386Enh]
COMnFIFO=1
COMnBUFFER=1024
COMBOOSTTIME=10
where n is the number of the COM port.
3. Start or Restart windows.
IV.
Netmanage Chameleon
Modem strings are based on a ZOOM V.34 (%C3 enables
V.42bis & MNP5 Compression) Check your modem manual
for the correct syntax...
Version 4.1
(Setup/Port)
1. Take the X out of Carrier Detect
2. Select a port speed of 115200
(Setup/Modem)
1. Intialize: AT&F&C1&D2%C3
Version 4.5
(Setup/Communications/Port)
1. Take the X out of Carrier Detect
2. Select a port speed of 115200
(Setup/Communications/Modem)
1. Select the ZOOM 14.4 model if your 28.8 is not listed.
Then select Setup & edit the modem string to AT&F&C1&D2%C3
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