These settings seem to work.  The general idea is that the modem on the
machine under test must be set up so that RTS/CTS (hardware) flow control is
off and xon/xoff (software) flow control is on (assuming that the modem
supports flow control, which is not the case for most older 2400 baud modems).

If your modem is not listed below, you need to look up in the manual how to:
    Ignore DTR
    Autoanswer on first ring
    Use XON/XOFF Flow control

It is usually a good idea to type AT&F to reset to factory default settings
before setting other parameters. When you are all done with the debugging,
use AT&F again to clear out the debug-specific settings.

Gateway Telepath:
US Robotics (including Gateway labeled):
    switches vary from model to model, but there is normally a reference card
    underneath the modem.  Switch numbers are given for the Sportster 14,400
    Data Terminal Ready (DTR) Operations  (switch 1 down): DTR always ON
    Auto Answer (switch 5 up): Modem answers on first ring.
    AT commands:
        AT&h2&i1Q2&r1&w

	For Telepath, add &d0s0=1  before the &w

        For HST Dual Standard, add B0 before the &w

    you may need to set at&n6 if you have a modem capable of 14.4 kbs, as
    this connection seems funny with many modems.  &n6 limits the user to
    9600 bps connections, only. &n3 sets it to 2400 baud.

Telepath modems:

Telebit modems (except Trailblazers T1000/T1500/T2000/T18PC):
    No switches
    AT commands:
        AT&d0s0=1s51=4s58=3&w

IBM model 7855-10:
    No switches
    From menu, first setup menu, choose AT instead of v.25bis command set
    Note: these modems seem to lose their settings, despite the AT&w command.
          Also, I have at one site had to have the serial cable removed from
          the com port once the system hung before the modem would answer.  In
          this case, just let the modem answer and re-attach the cable.
    AT commands:
        AT\m12\r1&d0s0=1&w

Multitech v.32:
    modem has two dip switches, one with 4 and one with 8 switches.
      On the eight pole switch, switch 1 is down (dtr force on), switch 5 is up
      (enable autoanswer), switch 7 down (RTS on).
      On the four pole switch, switch 1 down (CTS on), 3 up (Hayes mode)
    AT commands:
        AT&e5&w

Multitech Multimodem 2:
      On the eight pole switch, switch 1 is down (dtr force on), switch 5 is up
      (enable autoanswer), switch 7 down (RTS on), switch 11 is up (AT response),
      switch 12 is down (Async mode), switches 13 - 14 are up (force 9600),
      switch 15 is up (CD & DS normal)
    AT commands:
        AT&e5&w

Hayes Optima  and V-Series, Practical Peripherals Boca, Zoom, and many others:
    No switches
    AT commands:
        AT&k4&d0s0=1&w

AT&T Paradyne 
    No switches
    AT commands:
        AT\Q1\X1&d0s0=1&w0

Prometheus Promodem Ultima
    No switches
    AT commands:
        AT*f2&d0s0=1&w

Intel SatisFAXtion 14.4
    No switches
    AT commands:
        at\q1&d0s0=1

Motorola UDS v.3227
    No switches
    AT commands:
        AT\q1\j0&d0s0=1&w

Spartan or Microcom Deskport
    No switches
    AT commands:
        AT\Q1\X1&d0s0=1&w

Hayes Smartmodem 1200 or 2400 or 9600:
    Note that the older Hayes Smartmodem 9600 (NOT V-Series, Optima, etc.)
         used their own proprietary 9600 baud modulation and are only usable
         at 2400 baud with most modems available at IBM.
    No switches
    AT commands:
        AT&d0s0=1&w
    Special note for Hayes Smartmodems: in order to hang up and leave a
    system running, the customer at the MUT must briefly remove the phone
    line from the modem.  If the remote system just hangs up its modem,
    the MUT's Hayes will often generate a ctrl-c that will interrupt the
    remote kernel.