 
                        DOOM Modem Help Version 3 
 
 
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GENERAL INIT STRING 
------------------- 
 
 
Having problems with DOOM 1.2 serial?  I tried several modems and 
configurations.  The below init string seemed to provide the most  
consistent results across the widest number of modems.  DOOM requires 
a 9600 bps connect speed.  A 2400 baud modem won't work.  There are 
some utilities which claim to allow 14.4 connect speeds, but I have 
not been able to get the modems to respond properly after using them. 
(I prefer to wait for an official patch from ID). 
 
AT &F S46=0 &K0 &Q0 &D2 &W 
AT Z H0 
 
-------------------------------- 
SPECIFIC MODEM BRAND INIT STRING 
-------------------------------- 
 
Here is the much requested specific modem list.  If you have PROVEN 
connection methods and init strings, please send them to me so I can 
expand the list.  Thanks to the MANY people who provided so MANY lists 
of working modem strings and information! 
 
Boca M1440i (internal): 
ATS48=0S37=9S46=136%C0%E0%M0&K0&Q0&R1&C1&D2\G0\N1N0 
 
Boca 14.4k (internal): 
AT&C0N0S37=9&K0W0&Q0S36=3S48=128%C0 
 
Boca 14.4 Fax/Modem 
AT S46=0 S37=9 N0 &Q0 &D2 &K4 
 
Boca 14.4k (external): 
AT &F S0=1 S36=0 &K0 &Q6N0S37=9 &D2 
 
Boca 14.4k: 
AT S46=0 S37=9 N0 &Q0 &D2 &K0 %C0 
 
Cardinal 14.4k v.32bis, v.42bis Fax/Modem: 
AT &F N0 S37=9 &Q0 &D2 \N1 
 
Digicom Systems (DSI) (softmodem): 
AT Z \N0 &D2 &K0 S48=48 
 
Digicom Systems Scout Plus: 
ATZ*E0*N3*M0*S0*F0&D2 
 
Gateway Telepath: 
AT &F S37=9 %C0 &K0 &Q6 \G0 
 
Gateway Telepath 14.4k: 
AT S46=0 S37=9 N0 &Q0 &D2 &K0 %C0 
 
Gateway Telepath I: 
AT S0=1 &N6 &K0 &M0 
 
Gateway Telepath II: 
AT S0=1 S37=9 %C0 &Q0 &K0 
 
Generic v.32bis 14.4k Fax/Modem: 
AT \N0 %C0 B8 
 
Generic 14.4k Fax/Modem: 
AT S46=0 S37=9 N0 &Q0 &D2 %C0 \G0 &K0 
 
GVC 14.4k (internal): 
AT &F B8 \Q0 
 
Hayes 28.8k V.FAST Modem: 
AT &Q6 &K S37=9 N %C0 \N0 
 
Infotel 144I: 
AT&Q0 S37=9 N0 &D2 
 
Infotel 14.4: 
&F0 \N1 &D2 S37=F8 
 
Intel 14.4k: 
AT \N0 %C0 \Q0 B8 
 
Intel 14.4k (internal): 
AT Z B8 Q1 \C0 \N1 %C0 \V "H 
 
Microcom AX: 
&F \N1 \Q0 &D2 
 
Microcom QX/4232bis: 
AT %C0 \N0 
 
Netcomm M7F: 
AT &E &K0 B0 \V0 X4 &D2 \N1 \Q0 #J0 #Q9 %C0 
 
Nokia ECM 4896M Trellis V.32: 
AT Z %C0 /N0 
 
Nuvotel IFX 14.4 (internal): 
&F \N1 &D2  
 
Practical Peripherals 14400FX v.32bis: 
AT Z S46=0 &Q0 &D2 
 
Practical Peripherals 14400FX v.32bis: 
AT S46=0 &Q0 &K0 &D2 
 
Supra: 
AT &F0 S46=136 %C0 
 
Supra (external): 
AT &K &Q &D \N1 
 
Supra 14.4k v.32bis: 
AT &F S46=136 &Q0 &D2 
 
Supra 14.4k v.32bis: 
AT &K &Q &D \N1 
 
Telepath 14.4k: 
AT &F&M0&K0&N6&H0 S0=1 
 
Twincomm DFi 14.4: 
AT&F &Q0 %C0 S37=9 &D2 
 
UDS V.3223: 
&F \N1 \Q &D2 
 
UDS Fastalk 32BX: 
&F0 \N1 &D2 
 
USR Courier v.32bis: 
ATS0=1 S7=60 E1 Q0 V1 &C1 &D2 &H0 &K0 &M0 &N6 &A3 
 
USR Courier HST/DS 16.8k: 
First reset the modem in a communication program with AT&F&W 
AT X4 B0 &A0 &B0 &H2 &I0 &K0 &M0 &N6a 
 
USR DS v.32bis v.42bis (external): 
AT&m0&n6&a0&r1&h0&k0&i0&s0&b1x1 
 
USR Sporster 9600: 
AT&M0&K0&N6 
 
USR Sportster 14.4k Fax/Modem USING ERROR CORRECTION: 
AT S0=1 S7=60 E1 QO V1 &C1 &D2 &K0 &N6 &A3 
 
USR Sportster 14.4k Fax/Modem (internal): 
AT &F&M0&K0&N6&H0 
 
USR Sportster 14.4k (internal): 
AT &F &B1 &H0 &I0 &K0 &M0 &N6 &R1 
 
USR Sportster 14.4k: 
ATS0=1S7=60E1Q0V1&C1&D2&K0&N6&A3 
 
USR Sportster 14.4k: 
AT &F0 &K0 &M0 &N6 &H0 &I0 &B1 &R1 
 
USR Sportster 14,000 Fax Modem: 
AT S0=2 &N6 &K0 &M0 &I0 &H0 &R1 &A0 V1 X4 
 
USR 14.4k: 
AT &F&A0&K0&M0 
 
USR 14.4k 
AT &K0 &H0 &D0 &I0 &R1 
 
USR 14.4k Dual Standard 
ATB0&R1&B1&N6Q0X4&A0&D2&H0&I0&K0&M0M1 
 
USR (model?): 
&F E1 V1 X4 &C1 &D2 &N0              
 
ViVa 14.4k: 
AT&F&Q6\N0%C0&D2N0S37=9 
 
ViVa modem (internal): 
&F&Q6\N0%C0&D2N0S37=9 
 
Zoltrix model 14/14 VE: 
AT S0=Q0 V1 &C1 &D2 W2 &Q0 
 
Zoom 14.4k VFX: 
AT&Q6S37=9N0%C\N0 
 
Zoom 14.4k VFX: 
AT&Q6S37=11N0%C&K0 
 
Zoom OEM Modem: 
AT&Q6S37=9N0&K0 
 
Zyxel U-1496E: 
AT Z &N4 &K0 
 
 
I will add to this list as soon as I get ABSOLUTE verification on other  
modems.  Keep in mind, sometimes even these settings have to be tweaked  
in order to work with different modems (see specific settings below). 
We have had some modems provide incredible smooth play when "tweaked"  
properly.  If you have one you are confident with, please send me the 
modem vendor, version, and init string. 
 
 
------------------ 
CONNECTION METHODS 
------------------ 
 
Bascially, there are four effective ways to connect and play DOOM dialup: 
 
1.  Connect via the DOOM SETUP program. 
2.  Connect via command line options with the DOOM SERSETUP program. 
3.  Connect via a communication program and then with SERSETUP 
4.  Connect with redirected DOS commands and then with SERSETUP.  
 
 
----------------- 
DOOM SETUP METHOD 
----------------- 
 
a.  Edit your MODEM.CFG file.  Change the first line (MUST be the first 
    line) to provide the proper init string for your modem. 
 
b.  Run the program SETUP in your DOOM directory.  Choose "Play network/ 
    modem/serial..." 
 
c.  Choose Modem. 
 
d.  Tab to fields and set as desired.  The most important fields are 
    your COM port number. 
     
e.  Finally, one side must "CALL" (supply phone #) and the other player  
    must "Wait for Call".   
     
f.  After pressing F10, Your screen should clear.  Both sides should see  
    the init string sent to there modem AND an exact match response.  If 
    you lock up no modem response or ERROR, you need to check your  
    connection and modem init string. 
 
g.  Next, one side will dial the number.  The receiving (waiting) player 
    should see "Waiting for Call..." displayed. 
 
h.  Upon ring, the receiving modem should issue an ATA and the modems  
    connect. 
 
i.  This is the most common lock up point.  The modems connect, but the 
    game never detects the other player.  Did both sides connect at a  
    true CONNECT 9600?  Did you see the connect message from your modem? 
    (Look at modem command X4).  Are both modems in direct mode? (Look at 
    modem command \N1 or &Q0).  Is there a flow control or break option 
    causing a problem?  (Look at modem commands &K, \Q, \G, \K, &R).  The  
    modem commands are described in more detail in a later section.  Also 
    check the IRQ settings for your COM port.  Is everything reporting  
    correctly?  You can run the utility MSD (comes with Windows) to get 
    precise information on your COM ports and their IRQs). 
 
j.  After each side detects and connects, the screen will clear and the 
    blue ribbon will display across the top.  The normal DOOM startup and 
    initialization will take place. 
 
k.  Finally, each side display a message indicating it is SENDING or 
    LISTENING for the other player.  The same troubleshooting points above 
    apply here.  This is the next point of common lock up. 
 
l.  The last point where a lock up is encountered is right after the game 
    "starts".  Each player is frozen.  Look here for not enough flow  
    control options set. 
 
m.  Occasionally, I have run into CONSISTENCY FAILURES and  
    NETTICS > BACKUPTICS.  I currently have no solution for consisitency 
    failures -- although it does seem to be more prevelant with specific  
    modem combinations.  The NETTICS > BACKUPTICS seems to be due to 
    over-zealous modem tweaking.  Put some flow control back in and let 
    the program and/or modem throttle the data. 
 
 
---------------------------- 
COMMAND LINE SERSETUP METHOD 
---------------------------- 
 
a.  This assumes you have read the standard connection information and 
    edited your MODEM.CFG file, etc. 
 
 
b.  The caller should start SERSETUP.  For example: 
 
    SERSETUP -com1 -dial 555-1212 
 
c.  The receiver should start SERSETUP.  For example: 
 
    SERSETUP -com1 -answer 
 
d.  Of course, you would specifiy YOUR COM port and the correct number to 
    dial.  Additional options can be specified, but just stick with the 
    basics when troubleshooting.  See the DOOM README info for more on  
    command line options. 
 
 
---------------------------- 
COMMUNICATION PROGRAM METHOD 
---------------------------- 
 
a.  This assumes you have read the standard connection information and 
    edited your MODEM.CFG file, etc. 
 
b.  Each side should start a communication program like Qmodem or Procomm. 
    Each side should manually issue the AT commands to set the modem.  For 
    example: 
 
    AT &F \N1 &D2 
    
c.  The caller should dial the receiver.  For example: 
 
    ATDT 555-1212 
 
d.  When the phone rings, the receiver should issue the AT answer command. 
    For example: 
 
    ATA 
 
e.  After the modems connect, exit the program (try to leave the connection 
    up or leave DTR high.  You may have to alter the &D2 to a different 
    value to cause the modem to stay connected). 
 
f.  Each side should start the SERSETUP.  For example: 
 
    CD \DOOM 
    SERSETUP -com1 
 
g.  Of course, you would specifiy YOUR COM port and the correct number to 
    dial.  Additional options can be specified, but just stick with the 
    basics when troubleshooting.  See the DOOM README info for more on  
    command line options. 
 
 
----------------------------- 
REDIRECTED DOS COMMAND METHOD 
----------------------------- 
 
a.  This jewel came from Cris Williams (75300,2704) on Compuserve.  It 
    does indeed work when other methods fail. 
 
 
b.  This assumes you have read the standard connection information and 
    edited your MODEM.CFG file, etc. 
 
 
c.  These examples assume COM port 1 and a phone number of 555-1212.  Alter 
    according to your setup and real phone numbers. 
 
d.  Both sides issue the MODE command to the modem from the DOS (i.e. C:) 
    prompt: 
 
    MODE COM1:9600,N,8,1,P 
 
e.  Both sides issue a redirected ECHO command to set the modems to place in 
    direct mode and disable compression, etc...  For example: 
 
    ECHO AT&F &Q0 &D2 > COM1 
 
f.  The caller should issue the dial sequence.  For example: 
 
    ECHO ATDT555-1212 > COM1 
 
g.  When the phone rings, the receiver should issue the command: 
 
    ECHO ATA > COM1 
 
h.  Both sides should start SERSETUP.  For example: 
 
    SERSETUP -com1 
 
 
---------------------- 
COMMON MODEM COMMANDS 
---------------------- 
 
Here are the most common settings and what they do: 
 
&F    - This fetches the factory default in most modems.  Always a 
        good starting point.  Modems with multiple factory settings 
        may require a qualifier (i.e. &F0) 
 
S46=0 - This register setting disables compression on many v.32 and v.42 
        modems.  You might also try S46=136 or %C0. 
 
&K0   - Disable flow control between the modem (DCE) and your PC (DTE). 
        This was one of the most common problems -- You should look 
        at flow control options more closely if you connect and just hang 
        WITHOUT the screen clearing and displaying the blue banner.  Check 
        your modem documentation carefully.  The command(s) to manipulate 
        flow control varies quite a bit on various modems.  The commands 
        \G and \G0 were also quite common. 
 
&Q0   - Places the modem in DIRECT mode.  This is by far the best method 
        for pumping data down those wires!  At least to start with, stay  
        away from the error correcting and speed buffering configurations.   
        The command \N1 is the next most common command to set the modem  
        in direct mode.  
 
&D2   - DTR handling.  DTR is the signal (voltage) on the serial connector 
        on your PC that says "I'm here".  This control helps with initially 
        talking to the modem and disconnecting.  The &D2 in tells the modem 
        how to handle the loss of the DTR signal from the PC.  In this case, 
        the modem will go into COMMAND MODE from DATA MODE (if not already 
        there) and send the normal verbose response (i.e. "OK").  Many modems 
        also support a neat option (&D3) which recalls the prior  
        configuration. 
 
&W    - Write the configuration to the modem's memory.  This is optional 
        but I always like to do this -- just like I always like to use 
        the factory reset (&F) at the beginning.   
 
        IMPORTANT:  When you use the &W you permanently change your modem 
                    modem settings.  If your other communication programs 
                    do not set your modem each time, you may have to  
                    configure your modem for those other programs again. 
 
 
S37=F8  - Another very common problem is when 14.4 modems report a connect 
          of CONNECT 14400.  Doom requires 9600.  Try to force the modem  
          to 9600 bps.  F8 is hexadecimal notation.  Your modem  
          documentation may describe the settings in decimal or  
          in binary notation.  For example: 
 
          F8        - hexadecimal 
          248       - decimal 
          11111000  - binary 
 
          The binary notation is the most clear when interpreting the  
          effect to bit registers.  Once you set your bits correctly, 
          you can use the calculator in Windows 3.1 to binary/hex/decimal 
          conversions (when in the scientific mode). 
           
          Keep in mind the place holders and the least to most significant 
          bits!  It's easy to work in the wrong direction when dealing 
          with bit registers.   
 
          If binary notation is foreign to you, call your modem vendor 
          and describe what you need.  They will be able to give you the 
          proper code. 
 
          Another common speed setting is %B.  Some modems take a value,  
          i.e. %B4 while others take the speed i.e. %B9600 
 
 
Other areas which helped depending on the modem (or modem connected to) 
was with flow control and slave speed.  Your modem may or may not respond 
or allow some of these settings.  (Some modems simply locked up). 
 
\J0     -   Slave the DTE (PC) to DCE (modem) speed.  \J is sometimes used 
            (no 0 qualifier required or used). 
 
&R1     -   Force Ready-To-Send and/or Clear-To-Send high.  On a couple of 
            if your modem is using EIA leads for flow control, this leaves 
            the pipe wide open. 
 
\K5     -   Break control.  Haven't determined how effective this is and what 
            effect the break and buffer flush has on DOOM.  It's worth  
            experimenting with. 
 
 
 
    
----------------------------------------------------------------------------- 
 
I hope this helps you frustrated serial players out there. 
 
Finally, thanks to ID for the most awesome games I've played.  Wolf3D, 
SPEAR, and DOOM have provided the best value for my money.  I urge you 
to register your software to help support them! 
 
Please note I have been SWAMPED with responses and requests for help.   
Please be patient for a response if you write.  If you do write, try to  
give as much exact information as possible:  Modem vendor, modem model,  
modem revision (use the ATI and AT&F or AT\S command).  Also include the  
EXACT init strings you've used and EXACTLY where you locked up.  Write 
down ALL of the last 5 lines displayed on the screen before locking up. 
If I can, I'll try to help.  Unfortunately, I am receiving so many requests, 
I may have to stop responding...  Hopefully, things will slow down... 
 
If you have found a working connect method or init string, please send it 
to me with the modem type and model number.  (What was used on BOTH sides 
would be even better!). 
 
 
Keith Turbyfill 
Compuserve ID: 73322,332 
America On Line ID: turby 
Internet ID: turby@aol.com 
 
 
