INIT1=AT &F
INIT2=AT &K0 &M0 &N6
HANGUP=AT H0
BAUD=9600
ALTBAUD=14400
ALTBAUDINIT=AT &N8
COM=
IRQ=
PORT=
VECTOR=
NODROPDTR=

EPISODE=
MAP=
DEATHMATCH=
ALTDEATH=
NOMONSTERS=
RESPAWN=
LOADGAME=
DEVPARM=
SKILL=
DIAL=
WADNAME=
DIRECTORY=
DOOMEXE=
DOOMVER1_2=
CONFIG=
PLAYER=
PULSEDIAL=

NAME=Russell
NUMBER=9,1-800-555-1212

NAME=Paul
NUMBER=1-800-123-4567

Explanations (keep these lowercase, keep above uppercase):

init1=<string> modem init string #1.  Ex. INIT1=AT &F   (USR Sportster 14.4i)
init2=<string> modem init string #2.  Ex. INIT2=AT &K0 &M0 &N6
hangup=<string>modem hangup string.  Ex. HANGUP=AT H0
baud=n         9600 (default), 14400, 19200, 38400, 57600, 115200 (16550 only).
altbaud=n      Alternate baud which can be chosen at startup. Ex. ALTBAUD=14400
altbaudinit=<string>  Modem baud command for 'altbaud'. Ex.  ALTBAUDINIT=AT &N8
com=n          com port number n. (default = 1)
irq=n          irq number n. (default set according to com port used)
port=0xn       com port hex address n. (default set according to com port used)
vector=0xn     irq hex vector number n (default found automatically in 0x60-66)
nodropdtr=n    set n = 1 to disable dropping dtr when exiting.

episode=n      episode number n. (default = 1)
map=n          map number n. (default = 1)
deathmatch=n   set n = 1 for deathmatch mode. (default = 0 = cooperative)
altdeath=n     set n = 1 for DeathMatch 2.0 (default = 0)
nomonsters=n   set n = 1 for no monsters. (default = 0)
respawn=n      set n = 1 for monster respawn after 8 seconds. (default = 0)
loadgame=n     load saved game number n (0 - 5).
devparm=<string>  arg(s) to pass with -devparm.  Ex. DEVPARM=-record file1
skill=n        skill level n. (default = 3)
dial=n         number for modem to dial.
wadname=<string>  wadfile name. Ex. WADNAME=wadfile.wad (1 file only)
directory=<string> wadfile directory.  Ex. DIRECTORY=wads or DIRECTORY=c:\wads
doomexe=<string>  name of doom executable without ".exe". (default = DOOM)
doomver1_2=n   set n = 1 for DOOM v1.2 and below. (default = 0)
config=<string> alternate doom config file.  Ex. CONFIG=c:\new.cfg
player=n       player number n (0/1). (default = 0) use 1 on slower computer
pulsedial=n    set n = 1 for pulse dial. (default = 0 = tone dial)
               name=<string>   phonebook name for number on next line.
number=n       phonebook number for previous name.

  * Values can be left empty.  Ex. CONFIG=
  * 8250 UARTs do not support 115200 baud.
  * Unlimited number of phonebook name/number entries -- Just add more.
  * Any parameter can be passed on to Doom by using the DEVPARM string in
    either the SER5.CFG file or the Configure feature at runtime, whether it
    requires -devparm or not.  See the list of other parameters in the Doom
    FAQ which is included in the latest version of Doom, and on the ftp sites.
    The Doom FAQ is currently DMFAQ58.TXT by Hank Leukart
    <ap641@cleveland.freenet.edu>.