
Part 1 - Zoom VFP/VFX 28800 Abridged Technical Referrence Document #VFP-DHT.
Part 2 - Zoom V.FC to V.34i Factory Upgrade Program Press Release & Info.

--------------------------------------------------[ PART #1 of 2 ]-----------

Zoom VFP-28800/VFX-28800 Abridged Technical Reference Manual.
Zoom Telephonics 4/28/1995, Document #VFP-DHT Revision 1.1.

*Note* This manual is NOT updated to include V34i modems. A seperate file
will soon be made available. We urge you to upgrade your V.FC Zoom modem
to V.34 for an additional fee of $49-$69 (depending on model). Advanced
upgrades are available for Sysops who do not wish to offline their systems.
Please call the Zoom toll-free order line for information and upgrade form.

---------------------------------------------------------------------------

This file contains information relevant to the most recent Zoom V.FC (not V34)
high-speed modems (mainly the VFP/VFX 28800 Zoom modems). If you are in doubt
as to whether this manual is for your modem, follow the below procedure:

  [ Determining whether you own a V.FC class modem ]

     1. Run your communications software and enter it's terminal mode to
        issue commands directly to the modem.

     2. Enter  ATI6^M  [^M = carriage return]

  [ Results ]

    1. If your modem displays "ERROR", you do not own a V.FC capable modem.

    2. If your modem displays "RC288DPx/VFC Rev NNXX" where NN is 01 thru 06
       and XX is AA-CC, then you have a V.FC modem which is covered by this
       text. Altough your modem is on the cutting edge of telecommunications,
       a new standard for higher-than-14.4kbps speeds has been rectified
       recently. This new standard is V34, otherwise known as "VFAST". All
       ZOOM V.FC class modems are factory upgradeable to V34, and we urge
       all V.FC owners to participate in our upgrade program. ALL ZOOM V34
       products are fully backward compatible with V.FC, therefore you do
       not stand to loose anything, and are gaining higher throughoutput,
       much improved call negotiation, enhanced fax/data negotiation, and
       operating stability with products from competing vendors which do
       not offer a "fully reliable" V.FC class in their products.

       If you do decide to participate in our factory upgrade program, please
       obtain the RCV34-VFP-DHT Document which covers ZOOM V34i products.

    3. If your modem displays "RC240DPx/VFC Rev NNXX" or "RC24000/VFC" or
       "VF24/RC" as part of the response to ATI6, you own a 24,000kbps
       V.FC class Zoom modem and are also urged to participate in the
       factory upgrade program in which we have included an option for
       24.0K Zoom modem owners to upgrade directly to 28.8 V34i! If however
       you do not choose to upgrade, reffer to this text as a summary of your
       modem's command set. Please note to disregard any mention of 28800 BPS
       specific commands or options, as they are not applicable to your modem.

    4. If your modem displays "RC288DPi/V34 REV NNXX" or includes "V34" as
       any part of the ATI6 result string, then you already have today's
       state of the art ZOOM V34 based modem, and therefore should obtain
       the RCV34-VFP-DHT Document which covers ZOOM V34i products.


========================================
AT Commands

========================================

AT commands communicate directly with
the modem when it is in command mode.
This section is a quick reference for
experienced modem users. If you are not
familiar with AT commands, we recommend
that you use communications software
rather than AT commands for all functions.
Software is easier for most users.

To summarize AT command syntax:

 o Multiple commands can be strung
   together in one line.
 o Command lines cannot exceed 40
   upper- or lower-case characters. (Do
   not mix upper- and lower-case.) The
   faxmodem ignores space and hyphen
   characters.
 o Command lines must start with AT
   and end with a carriage return (Return
   or Enter).
 o A missing command parameter is
   assumed to be a zero. For example, ATH
   is the same as ATH0.
 o A/ on a line by itself without a
   carriage return causes the faxmodem to
   repeat the previous command.

To switch to AT command mode from data
mode, wait at least one second, type +++
(the default escape characters), and
wait at least one second before entering
other characters. After the OK message
from the modem, you can enter AT
commands. To return to data mode, type
ATO and press Return (or Enter).

The string "*DEFAULT*" appears at the
end of the description of each default
setting. Note that not all commands
have default settings.

Command Function
-------------------------------------
A       Answers incoming call
        immediately
-------------------------------------
B0      Uses V.22 connection at 1200
        bps
B1      Uses Bell 212A connection at
        1200 bps *DEFAULT*
-------------------------------------
Dn      Dials telephone number n

You can combine D with one or more of
the following modifiers:
   L    Redials last number
   P    Uses pulse dialing
   T    Uses tone dialing
   W    Waits for dial tone
   ,    Pauses during dial as 
        specified in register S8
        (default: 2 sec.)
   @    Waits for at least 5 seconds
        of silence
   R    Command accepted but not
        acted upon.
   ;    Returns to command mode after
        dialing (put after dial
        string)
   !    Goes on hook (time specified
        in S29)
S=(0-3) Dial one of 4 numbers stored
         with &Zn
  ^     Turn on calling tone (data
        only)
------------------------------------
E0      Command characters not
        echoed
E1      Command characters echoed
        *DEFAULT* 
------------------------------------
F7, F9, and F10 apply only to V.32bis
faxmodems
F0      Selects auto-detect mode
        (same as N1) *DEFAULT*
F1      Selects V.21 or Bell 103 (same
        as N0 S37=1)
F3      Selects 75 bps send/1200 bps
        receive V.23 (same as N0
        S37=7)
F4      Selects 1200 bps V.22 (same
        as N0 S37=5)
F5      Selects 2400 bps V.22bis
        (same as N0 S37=6)
F6      Selects 4800 bps V.32bis/V.32
        (same as N0 S37=8)
F7      Selects 7200 bps V.32bis
        (same as N0 S37=12)
F8      Selects 9600 bps V.32bis/V.32
        (same as N0 S37=9)
F9      Selects 12,000 bps V.32bis
        (same as N0 S37=10)
F10     Selects 14,400 bps V.32bis
        (same as N0 S37=11)
F13-F19 apply to V.Fast Class faxmodems
only
F13 (19.2, 24K, and 28.8 V.FC only)
        Selects 14,400 bps V.FC
        (same as N0 S37=15)
F14 (19.2, 24K, and 28.8 V.FC only)
        Selects 16,800 bps V.FC
        (same as N0 S37=16)
F15 (19.2, 24K, and 28.8 V.FC only)
        Selects 19,200 bps V.FC
        (same as N0 S37=17)
F16 (24K and 28.8 V.FC only)
        Selects 21,600 bps V.FC
        (same as N0 S37=18)
F17 (24K and 28.8 V.FC only)
        Selects 24,000 bps V.FC
        (same as N0 S37=19)
F18 (28.8 V.FC only)
        Selects 26,400 bps V.FC
        (same as N0 S37=20)
F19 (28.8 V.FC only)
        Selects 28,800 bps V.FC
        (same as N0 S37=21)
------------------------------------
H0      Forces faxmodem to hang
        up
H1      Forces faxmodem off-hook
------------------------------------
I0      Returns 3-digit product code
I1      Returns ROM checksum
I2      Computes checksum, compares
        with value in ROM, and
        returns OK or ERROR
I3      Returns firmware revision
        code
I4      Returns faxmodem identifier
        string
I5      Returns country code
I6      Returns data pump model and
        revision code
------------------------------------
L0      Lowest speaker volume
L1      Low speaker volume *DEFAULT*
L2      Medium speaker volume
L3      Highest speaker volume
------------------------------------
M0      Speaker always off
M1      Speaker on until carrier
        detected *DEFAULT*
M2      Speaker always on
M3      Speaker on during answering
        only
-------------------------------------
N0      Disables auto-mode detection;
        connection speed specified by
        Fn or register S37
N1      Enables auto-mode detection
        (same as F0) *DEFAULT*
-------------------------------------
O0      Enters data mode
O1      Enters data mode and retrains
        faxmodem to phone line
        conditions
-------------------------------------
P       Pulse dialing until T
        command
-------------------------------------
Q0      Enables responses to computer
        (DTE) *DEFAULT*
Q1      Disables responses to
        computer
-------------------------------------
Sn      Establishes S-register n as
        the default register
Sn=v    Sets register n to value v
Sn?     Returns the value of register n
-------------------------------------
T       Tone dialing until P command
        *DEFAULT*
-------------------------------------
V0      Send numeric (terse)
        responses
V1      Send word (verbose)
        responses *DEFAULT*
-------------------------------------
W0      Reports DTE (computer-to-
        modem) speed only *DEFAULT*
W1      Reports DCE (modem-to-modem)
        speed, error correction
        protocol, and DTE speed
W2      Reports DCE (modem-to-modem)
        speed only
-------------------------------------
X0      Sends OK, CONNECT, RING, NO
        CARRIER, ERROR and NO ANSWER.
X1      Sends X0 messages and CONNECT
        speed
X2      Sends X1 messages and NO
        DIALTONE.
X3      Sends X2 messages and BUSY
X4      Sends all responses *DEFAULT*
------------------------------------
Y0      Disables long space
        disconnect *DEFAULT*
Y1      Enables long space
        disconnect; with error
        correction, hangs up after
        1.6 second signal break;
        without error correction,
        sends 4 second space before
        hanging up
------------------------------------
Z0      Resets faxmodem to profile 0.
        (See &W0.)
Z1      Resets faxmodem to profile 1.
        (See &W1.)
------------------------------------
&C0     Forces RLSD (DCD) on *DEFAULT*
&C1     RLSD (DCD) follows remote
        carrier
------------------------------------
&D0     DTR is assumed on. Allows
        operation with DTEs that do
        not provide DTR signal *DEFAULT*
&D1     Modem interprets DTR drop as
        if it received the escape
        sequence. Returns to command
        mode without disconnecting.
&D2     DTR drop causes modem to hang
        up. Auto-answer is inhibited
&D3     DTR drop causes modem to do
        soft reset. &Y setting
        determines which profile is
        loaded.
------------------------------------
&F      Loads factory profile
------------------------------------
&G0     Disables guard tone *DEFAULT*
&G1     Disables guard tone
&G2     Enables 1800 Hz guard tone
------------------------------------
&K0     Disables flow control
&K3     Enables RTS/CTS (hardware)
        flow control *DEFAULT*
&K4     Enables XON/XOFF flow control
------------------------------------
&M0     Selects direct asynchronous
        mode (&Q0)
------------------------------------
&P0     Make/break dial ratio of
        39/61 at 10 pulses per
        second (pps) *DEFAULT*
&P1     Command accepted but not
        acted upon.        
&P2     Command accepted but not
        acted upon.
&P3     Command accepted but not
        acted upon.
------------------------------------
&Q0     Selects direct asynchronous
        mode (no error correction or
        speed buffering)
&Q5     Faxmodem negotiates error-
        correcting connection *DEFAULT*
&Q6     Selects asynchronous mode
        with speed buffering (no
        error correction)
------------------------------------
&S0     Forces Data Set Ready (DSR)
        on continuously *DEFAULT*
&S1     DSR active after answer tone
        detected and inactive after
        carrier loss
------------------------------------
For engineering testing only
&T0     Ends test in progress
&T1     Starts local analog loopback
        test
&T3     Starts local digital loopback
        test
&T4     Responds to remote modem
        request for digital loopback
        *DEFAULT*
&T5     Ignores remote modem request
        for digital loopback
&T6     Requests remote digital
        loopback without self-test
&T7     Same as &T6 with self-test
&T8     Starts local analog loopback
        with self-test
------------------------------------
&V      Displays current and stored
        profiles, and stored
        numbers
------------------------------------
&W0     Saves active configuration as
        profile 0
&W1     Saves active configuration as
        profile 1
------------------------------------
&Y0     Faxmodem uses profile 0 on
        powerup. (See &W0.) *DEFAULT*
&Y1     Faxmodem uses profile 1 on
        powerup. (See &W1.)
------------------------------------
&Zn=x   Stores telephone number (up
        to 45 digits) x in non-
        volatile memory location n (0-
        3)
------------------------------------
%C0     Disable data compression
%C1     Enable MNP5 compression
%C2     Enable V.42bis compression
%C3     Enables both MNP5 and V.42bis
        compression *DEFAULT*
------------------------------------
%E0     Disables line-quality
        monitoring and auto-
        retraining *DEFAULT*
%E1     Enables monitoring and
        retraining
%E2     Enables monitoring and
        fallback/fall forward
%E3     Enables monitoring,
        retraining, and fast hang
        up
-------------------------------------
%L      Reports received signal level
        in -dBm
-------------------------------------
%Q      Reports line signal
        quality
-------------------------------------
\A0     64-character maximum MNP
        block size
\A1     128-character maximum MNP
        block size *DEFAULT*
\A2     192-character maximum MNP
        block size
\A3     256-character maximum MNP
        block size
-------------------------------------
\Bn     In non-error correction mode,
        transmits line break to
        remote modem in 100 ms units
        (1-9 with 3 as default)
-------------------------------------
\G0     Disables XON/XOFF (modem-to-
        modem) flow control *DEFAULT*
\G1     Enables XON/XOFF (modem-to-
        modem) flow control
-------------------------------------
\Kn     Defines break type
-------------------------------------
\L0     Uses stream mode for MNP
        connection *DEFAULT*
\L1     Uses interactive block mode
        for MNP connection
-------------------------------------
\N0     Normal data link with speed
        buffering; disables error
        correction
\N1     Selects serial interface;
        same as &Q0
\N2     Selects reliable (error
        correction) mode
\N3     Selects auto-reliable mode
\N4     LAPM error correction only
\N5     MNP error correction
        only



=====================================
S Registers

=====================================

This section summarizes S registers.
You can change the setting of an S
register using an AT command. For
example, ATS6=4 .

Reg  Range/    De-  Function
is-    Value   fau
ter            lt
======================================
S0   0-255     0    Number of rings
     rings          to auto-answer
--------------------------------------
S1   0-255     0    Counts incoming
     rings          rings
--------------------------------------
S2   0-255     43   Escape
     ASCII          character
--------------------------------------
S3   0-127     13   Carriage return
     ASCII          character
--------------------------------------
S4   0-127     10   Line feed
     ASCII          character
--------------------------------------
S5   0-255     8    Backspace
     ASCII          character
--------------------------------------
S6   2-255     2    Dial tone wait
     seconds        time before blind
                    dialing
--------------------------------------
S7   1-255     50   Remote carrier
     seconds        wait time
--------------------------------------
S8   0-255     2    Comma pause time
     seconds
--------------------------------------
S9   1-255     6    Carrier detect
     100 ms         response time
--------------------------------------
S10  1-255     14   Delay between
     100 ms         carrier loss and
                    hang up
--------------------------------------
S11  50-255    95   Tone duration in
     1 ms           DTMF dialing
--------------------------------------
S12  0-255     50   Escape code guard
     20 ms          time
--------------------------------------
S13                 RESERVED
--------------------------------------
S14                 BIT MAPPED
                    OPTIONS
--------------------------------------
S15                 RESERVED
--------------------------------------
S16                 TEST MODE BIT
                    MAPPED OPTIONS
--------------------------------------
S17                 RESERVED
--------------------------------------
S18  0-255     0    Modem test timer
     seconds
--------------------------------------
S19-                RESERVED
20
--------------------------------------
S21                 V.24 BIT MAPPED
                    OPTIONS
--------------------------------------
S22                 SPEAKER BIT
                    MAPPED OPTIONS
--------------------------------------
S23                 BIT MAPPED
                    OPTIONS
--------------------------------------
S24  0-255     0    Sleep inactivity
     seconds        timer
--------------------------------------
S25  0-255     5    Data Terminal
     10 ms          Ready delay
--------------------------------------
S26  0-255     1    RTS-to-CTS
     10 ms          delay
--------------------------------------
S27                 BIT MAPPED
                    OPTIONS
--------------------------------------
S28                 BIT MAPPED
                    OPTIONS
--------------------------------------
S29  0-255     0    Flash dial
     10 ms          modifier
                    time
--------------------------------------
S30  0-255     0    Inactivity time
     10 seconds     before hang
                    up
--------------------------------------
S31                 BIT MAPPED
                    OPTIONS
--------------------------------------
S32  0-255     17   XON character
--------------------------------------
S33  0-255     19   XOFF
     ASCII          character
--------------------------------------
S34-                RESERVED
35
--------------------------------------
S36  0, 3, 4,   7   LAPM failure
     7              control

       0            Modem disconnects
       3            Modem stays on
                    line and
                    establishes a
                    Normal mode
                    (speed buffering)
                    connection.
       4            Attempts MNP
                    connection; if
                    fails,
                    disconnects
       7            Attempts MNP
                    connection; if
                    fails,
                    establishes a
                    Normal mode
                    (speed buffering)
                    connection.
--------------------------------------
S37  0-12      0    Desired DTE
                    connection speed

     0              Attempt automode
                    connection (F0)
     1-3            Attempt to
                    connect at 300
                    bps (F1)
     4              Reserved
     5              Attempt to
                    connect at 1200
                    bps (F4)
     6              Attempt to
                    connect at 2400
                    bps (F5)
     7              Attempt to
                    connect at  75
                    bps send/ 1200
                    bps receive V.23
                    (F3)
     8              Attempt to
                    connect at 4800
                    bps (F6)
     9              Attempt to
                    connect at 9600
                    bps (F8)
     10             Attempt to
                    connect at 12000
                    bps (F9)
     11             Attempt to
                    connect at 14000
                    bps (F10)
     12             Attempt to
                    connect at 7200
                    bps (F7)
---------------------------------------
S38  0-255     20   Delay before
     seconds        forced
                    disconnect
---------------------------------------
S39  0-6       3    FLOW CONTROL

       0            No flow control
       3            RTS/CTS (&K3)
       4            XON/XOFF
       5            Transparent XON
                    (&K5)
       6            Both methods
                    (&K6)
--------------------------------------
S40-                BIT MAPPED
41                  OPTIONS
--------------------------------------
S42-                RESERVED
45
--------------------------------------
S46  136 or    138  Data compression
     138            selection

       136          Error correction
                    with no
                    compression
       138          Error correction
                    and compression
--------------------------------------
S48  0, 7, or    7  V.42 negotiation
     128            action

       0            No negotiation;
                    bypass detection
                    and negotiation
                    phases; proceed
                    with LAPM
       7            Negotiation
       128          No negotiation;
                    bypass detection
                    and negotiation
                    phases; proceed
                    with S36 fallback
                    action
--------------------------------------
S80                 RESERVED
--------------------------------------
S82  3, 7, or  128  Break handling
     128            options

       3            Break immediate;
                    data integrity
                    maintained ahead
                    of and after
                    break
       7            Break immediate;
                    data at time of
                    break destroyed
       128          Break in sequence
                    with any
                    transmitted data;
                    data integrity
                    maintained ahead
                    of and after
                    break
---------------------------------------
S86  0, 4, 5,  non  Call failure
     6, 7, 8,  e    responses
     9, 10,
     11, 12,        
     13, 14

       0            Normal
                    disconnect, no
                    error
       4            Loss of carrier
       5            V.42 negotiation
                    failed to detect
                    error correction
                    modem at remote
                    end
       6            No response to
                    feature
                    negotiation
       7            This modem is
                    asynch only;
                    remote modem is
                    synch only
       8            No framing
                    technique in
                    common
       9            Modems could not
                    find a common
                    protocol
       10           Bad response to
                    feature
                    negotiation
       11           No synch
                    information from
                    remote modem
       12           Remote modem
                    initiated a
                    normal disconnect
       13           Remote modem does
                    not respond after
                    10 message re-
                    transmissions
       14           Protocol
                    violation
----------------------------------------
S95  Add       0    Extended result
     numbers        codes
     below for
     desired
     messages:

       0            CONNECT gives
                    computer-to-modem
                    (DTE) speed
                    Extended result
                    codes: S register
       1            CONNECT gives DCE
                    speed
       2            /ARQ after
                    CONNECT if error
                    correction is
                    active
       4            CARRIER message
       8            PROTOCOL message
       32           COMPRESSION
                    message


========================================
Result Codes

======================================== 

The table of results codes below
indicates the verification messages that
the faxmodem generates depending on the
currently active Xn option. The default
setting is X4. To select short form mes
sages, enter the command AT V0 . To
select long form messages, enter the
command AT V1 . The default is V1.

A check in a column indicates that the
message is generated by the modem when
you have chosen the value shown at the
top of the column with ATXn command. If
the column is blank, the modem does not
generate a message for that X option. A
"1" or "3" after a check mark indicates
the less explicit message that the modem
generates for that option. For example,
if the modem is set for long form
messages, the value of Xn is X0, and the
computer-to-modem speed is 1200 bps, the
modem generates the message "CONNECT"
and not "CONNECT 1200".

Short  Long          n Value in ATXn
Form   Form          Command
                     0   1   2   3   4
---------------------------------------                     
 0     OK            x   x   x   x   x    
 1     CONNECT       x   x   x   x   x                       
 2     RING          x   x   x   x   x                          
 3     NO CARRIER    x   x   x   x   x                    
 4     ERROR         x   x   x   x   x                         
 5     CONNECT 1200  x1  x   x   x   x           
 6     NO DIALTONE   x3  x3  x   x   x        
 7     BUSY          x3  x3  x3  x   x  
 8     NO ANSWER     x   x   x   x   x               
 9     CONNECT 0600  x1  x   x   x   x  
 10    CONNECT 2400  x1  x   x   x   x  
 11    CONNECT 4800  x1  x   x   x   x  
 12    CONNECT 9600  x1  x   x   x   x  
 13    CONNECT 7200  x1  x   x   x   x  
 14    CONNECT 12000 x1  x   x   x   x  
 15    CONNECT 14400 x1  x   x   x   x  
 16    CONNECT 19200 x1  x   x   x   x  
 17    CONNECT 38400 x1  x   x   x   x  
 18    CONNECT 57600 x1  x   x   x   x  
 22    CONNECT       x1  x   x   x   x  
       1200TX/75RX
 23    CONNECT       x1  x   x   x   x  
       75TX/1200RX
 40    CARRIER 300                   x                   
 44    CARRIER                       x                       
       1200/75
 45    CARRIER                       x                       
       75/1200
 46    CARRIER 1200                  x
 47    CARRIER 2400                  x
 48    CARRIER 4800                  x
 49    CARRIER 7200                  x
 50    CARRIER 9600                  x
 51    CARRIER 12000                 x
 52    CARRIER 14400                 x
 66    COMPRESSION:                  x
       CLASS 5
 67    COMPRESSION:                  x
       V.42 bis
 69    COMPRESSION:                  x
       NONE
 76    PROTOCOL:                     x
       NONE
 77    PROTOCOL:                     x
       LAPM
 80    PROTOCOL: ALT                 x
 33    FAX           x   x   x   x   x              
+F4    +FCERROR      x   x   x   x   x                
 35    DATA          x   x   x   x   x                

End of Zoom Telephonics 4/26/1995, Document #VFP-DHT Revision 1.1.


--------------------------------------------------[ PART #2 of 2 ]-----------

*** News As Of April 25, 1995 ***

CUSTOMERS WHO ARE NOT SYSOPS ARE ALSO ELIGIBLE FOR UPGRADE! CALL OUR
TOLL FREE ORDER LINE FOR INFORMATION! WE STRONGLY URGE ALL ZOOM V.FC
MODEM USERS (INCLUDING END USERS AND SYSOPS) TO PARTICIPATE IN OUR
FACTORY UPGRADE PROGRAM TO OBTAIN V34 COMPATIBILITY! PLEASE CALL
OUR TOLL FREE ORDER LINE OR FAX-BACK LINE FOR FURTHER INFORMATION!

DON'T DELAY! THE UPGRADE PROGRAM FOR NON-SYSOPS WILL NOT LAST LONG!

--------------------------------------------------------------------------

Zoom Telephonics Begins Upgrades from V.Fast Class to V.34 For SYSOPS!
  (Non Sysops are also eligible to participate! Call us for details!)

Bulletin Board System Operators (SysOps) who purchased Zoom V.Fast
Class FaxModems under the Zoom SysOp program may now upgrade to V.34.
The cost of the upgrade from 28800 bps V.Fast Class to V.34 is $49.
The cost to upgrade from 24K V.Fast Class to 28.8 V.34 is $69.
Prices include shipping and handling.  Massachusetts sales tax is
applicable on orders from Massachusetts residents.

Upgrades will be done at the factory, where new components will be
installed and the units will be tested.  Customers may choose to
receive an advance replacement for their current unit(s), or they may
elect to send in their current unit(s) and have that unit(s) upgraded
to V.34

In the advance replacement program, a V.34 unit is received by the
customer before the V.Fast Class unit is returned to Zoom Telephonics.
Customers receiving an advance replacement unit must recognize they
are receiving a refurbished unit, which has been fully tested but is
not new.  A valid Visa, MasterCard, or American Express credit card
must be used to receive an advance replacement.  If the V.Fast Class
unit is not sent to Zoom within fourteen days of the receipt of the
V.34 upgrade, the credit card will be charged for the current SysOp
price of the V.34 unit.

V.Fast Class upgrades will be handled using an Upgrade Authorization
Number process.  A customer who wants an advance replacement upgrade
should fax or mail in a request to Zoom Telephonics using Zoom's order
form for SysOp upgrades.  We will schedule th e flow of advance
replacement units, and customers will be provided with a date when
Zoom Telephonics will send the V.34 unit.  Customers will also be
provided with an Upgrade Authorization (UA) number to be used when the
V.Fast Class unit is sent to Zoom Telephonics.  The UA number must be
on the shipping package when the unit is returned.

The SysOp Upgrade Order form is available on Zoom's BBS
(617-423-3733), in our CompuServe forum (Go Zoom), or can be obtained
by calling Zoom faxback service at: (617) 423-4651.  Select document
#98.

Customers who elect not to receive an advance replacement, and choose
to have their units upgraded and returned to them may call
(617)423-1072 Ext.  3014 to receive a UA number.  Those customers may
return their units for an upgrade as soon as the UA numb er is
received.  Please allow one week of processing time from the receipt
of the unit at Zoom Telephonics.  If a method of return other than UPS
Ground is desired, UPS Blue or UPS Red are available for an extra
charge.  Add $7.00 for the first unit sent by Second Day Air (UPS
Blue) and $3.00 for each additional unit.  Add $17.00 for the first
unit sent by Next Day Air (UPS Red), and $5.00 for each additional
unit.

A MasterCard, Visa, or American Express card is the preferred method
of payment for the V.34 upgrades and are required for an advance
replacement.  A money order or company check may be used for upgrades
which are not advance replacements.

When you return your V.Fast Class faxmodem, please return only the
modem hardware.  Do not send us the manuals, phone cords, power
supplies, or software.

Zoom Telephonics reserves the right to terminate or modify the terms
of this offer at any time without prior notification.  This offer is
void where prohibited by law.  This offer is subject to availability.

                  SysOp Order Form for V.34 Upgrade

Upgrade From       Upgrade To    Quantity    Price     Extended Price
VFP 24K Internal   V.34I Internal            $69
VFX24K External    V.34X External            $69
VFP28.8 Internal   V.34I Internal            $49
VFX28.8 External   V.34X External            $49
                     Total Quantity:                   Total Price:
*Ship By:

__ UPS Ground (No Charge)

__ UPS Blue (2nd Day) add $7.00 for first unit, $3.00 for each additional unit

__ UPS Red (Next Day) add $17.00 for first unit, $5.00 for each individual unit.

**Canadian shipping add $10.00 plus $2.00  per unit ordered.

Must Have Original Invoice Number:______Order Number:_____ Serial Number:______

Payment Information:  _____Amex    _____Visa    _____MasterCharge

Card Number:__________________________________________________________

Expiration Date:____________

____ I would like to receive an advance replacement for the upgrades
ordered.  I understand Zoom will contact me with the date I can expect
to receive my upgrades.

____ I want to keep my faxmodems and have them upgraded.  Please
provide me with an Upgrade Authorization Number.

Both pages of this order form must be fully completed.  Any order form
with incomplete information will be refused.  Please check your order
form before sending it.

The following conditions apply in order to qualify for special V.34
SysOp upgrade pricing:

-Units to be upgraded must have been purchased under the Zoom
 BBS/SysOp Program.

-When the V.Fast Class faxmodem is returned to Zoom, send only the
 hardware.  DO not send manuals, phone cords, power supplies, or
 software.

-All units upgraded must be used on the BBS.  The BBS must be
 available a minimum of 30 hours per week.  All units must be used for
 a minimum of 9 months on the BBS.



-Zoom FaxModems upgraded under this program will be marked "NOT FOR
 RESALE".  The SYSOP may not resell the unit as a new product if sold
 after 9 months of use on the BBS.

- Only U.S. and Canadian upgrade orders will be accepted.

- Advance replacement units are refurbished and fully tested units.
  They are not sold as new units.

- A valid Visa, MasterCard, or American Express credit card must be
  used to receive an advance replacement.  If the V.Fast Class unit is
  not sent to Zoom within fourteen days of the receipt of the V.34
  upgrade, the credit card will be charged for the current SysOp price
  of the V.34 unit.

- Advance replacement orders must be placed with this form by fax
  (617-423-9231), or by mailing to:

                Zoom Telephonics
                207 South Street
                Boston, MA 02111
                Attn: SysOp Program


BBS/SysOp Information:


BBSName:________________________________________________________________

BBS Phone:_________________________  BBS Software:______________________

No. of Phone Lines:___________  How Long In Operation:__________________

Phone Number Zoom will Be Installed on: _________________________________

Internet Email Address:(N/A if none)____________________________________

Compuserve Email Address:________________________________________________

Other Email Address:_____________________________________________________


I certify that the unit purchased will be used on my BBS and is not
for resale or personal use.


________________________________________________________________________
(Signature)


Order Information:

Date:____________________

Name:____________________________________________________________________

Address:_________________________________________________________________

City:___________________________ State:____________ Zip Code:____________

Daytime Phone:__________________________  Fax:___________________________

Home Phone:______________________________________________________________



If you have any questions, contact the SysOp Program at:

                        Voice: 617-423-1072 Ext. 3014   Fax: 617-423-9231
                        Data:  617-423-3733 28.8 N-8-1-Sysop Manager            [0;40;37m                                         Compuserve: 71333.1527[1;36m
                        Internet: 71333.1527@Compuserve.com

*   U.S.  shipping goes by UPS Ground service.  If shipping to a P.O.
    Box or an A.P.O. you must use Parcel Post.
**  If shipping to Canada, add $10 for 1-4 units, $15 for 5 or more
    units for 2nd Day or Next Day Air to the total cost.


End of Zoom Telephonics 4/28/1995, Document #VFC-UPG Revision 1.


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