IBM 3550 EXPANSION UNIT MODEL 002


IBM Announcement Letter Number 192-257 dated October 5, 1992
IBM US - Last Revised on October 5, 1992


Brief Description of Announcement, Charges, and Availability

       The IBM 3550 Expansion Unit Model 002 provides desktop
capability and expansion for the ThinkPad (TM) 700 Personal System/2
(R) (PS/2 (R)) and IBM ThinkPad 700C PS/2 systems.  The unit accepts
the system using a simple docking procedure.  Releasing the system
unit from the expansion unit is also easy.
       Standard features include:
o   Two full-size, 16-bit Micro Channel (R) slots
o   One half-high bay supporting a 5.25-inch or 3.5-inch SCSI device
o   Universal AC power supply
o   SCSI on planar with internal connector
o   External ports
    -   SCSI
    -   Serial/Parallel
    -   Keyboard
    -   Pointing device
    -   VGA
o   System unit battery charging capability
o   Cover lock
o   System lock
o   Key controlled power
o   Security hook to attach cable or chain
o   Display stand.
       Planned Availability Date:  October 30, 1992.
 (TM) Trademark of International Business Machines Corporation.
 (R) Registered trademark of International Business Machines
   Corporation.
IN BRIEF . . .
o   Provides expansion capability to both the IBM ThinkPad 700 PS/2
    and IBM ThinkPad 700C PS/2
o   Satisfies the mobile user's requirement for desktop capability in
    a notebook system
o   Protects users' investment in supported IBM peripherals
o   Easy connection and removal of system unit
o   Simplified cable management of connected peripheral equipment
o   Optional Optical Drive Bezel Kit (#3780, 49G2670)
           This feature is required when installing the internal
    Rewritable Optical Drive (#0162, 6450162).


Customer Letter Section

DESCRIPTION
USER PRODUCTIVITY
The IBM 3550, with its easy system attachment, allows the user quick
access to a familiar desktop environment along with a system of
expanded capabilities.  Connecting or disconnecting the system to or
from external peripheral equipment in a single action eliminates
excessive cable handling between the system and the peripherals.
       The ease of initial installation of the IBM 3550 allows the
user to have the unit up and running quickly.
SYSTEM MANAGEMENT
Installation of the system unit is an easy action.  Cable management
of attached peripherals is enhanced by attaching them to the IBM 3550
one time only.  The user wishing to attach to the peripherals has
only to slide the system unit into the IBM 3550.
       The IBM 3550 has the capability of charging the system unit's
battery while in operation or when the system unit is powered off.
This allows the user to continue using the system without worrying
about the status of its battery.
INVESTMENT PROTECTION
The IBM 3550 uses Micro Channel architecture.  Customers already
owning desktop peripherals and applications, wishing to migrate to a
notebook system strategy, are able to use most of those peripherals
and attachments with the IBM 3550.  This can be viewed as an
extension of their current investment strategy.
GROWTH ENABLEMENT
For the customer with a notebook system strategy, the IBM 3550 allows
expanded capabilities to the notebook.  Two full-size, 16-bit Micro
Channel slots are available to accept various adapter cards.  A
single, half-high bay, capable of supporting a 5.25-inch or 3.5-inch
SCSI device, is also available to allow for growth and expansion.
BUSINESS SOLUTIONS
The IBM 3550 provides accessibility to numerous attachment cards,
peripheral devices and communications options allowing solutions for
most business applications.
       Two slots for cards, a bay for SCSI devices and various I/O
ports are available in the unit.  The following external ports are
standard:
o   SCSI
o   Serial/Parallel
o   Keyboard
o   Pointing device
o   VGA.
PRODUCT POSITIONING
The IBM 3550 Expansion Unit Model 002 is for users of the IBM
ThinkPad 700 PS/2 or the IBM ThinkPad 700C PS/2, who desire
simplified connections to peripheral equipment, additional expansion
capability and a familiar desktop environment.
PUBLICATIONS
       The following publication package is shipped with the IBM 3550
Model 002.  Additional copies are available immediately.
                                               ORDER       PART
TITLE                                          NUMBER      NUMBER
Publication Package
  Installation and Operating
    Instructions
  System Programs License
    Agreement
  Option Diskette                              S42G-2329   42G2329
       The following publications are also available immediately.
                                               ORDER       PART
TITLE                                          NUMBER      NUMBER
Hardware Maintenance Library
  Hardware Maintenance
    Specifications
  Hardware Maintenance
    Reference
  Option Diskette                              S42G-2330   42G2330
       The Publication Package contains the Installation and
Operating Instructions manual, System Programs License Agreement and
an Option Diskette.
       The Installation and Operating Instructions manual contains
general information on the IBM 3550, instructions on its operation,
installing and removing options, trouble shooting information and
specifications.
       The Hardware Maintenance Library publication is for service
personnel and details the many aspects of maintaining the machine.
The publication includes an option diskette that includes advanced
diagnostics and instructions for identifying the failing field
replaceable unit (FRU).
       To order, contact your IBM representative.
       The IBM System Library Subscription Service (SLSS) is not
available.
TECHNICAL INFORMATION
SPECIFIED OPERATING ENVIRONMENT
PHYSICAL SPECIFICATIONS:
Width:      330 mm (13.0 inches)
            330 mm (13.0 inches) display stand
Depth:      410 mm (16.1 inches)
            310 mm (12.2 inches) display stand
Height:     117 mm (4.6 inches) without display stand
            142 mm (5.6 inches) with display stand
Weight:     7.1 kg (15.7 pounds) without display stand
            8.8 kg (19.4 pounds) with display stand
OPERATING ENVIRONMENT:
AMBIENT AIR TEMPERATURE:
Power On:  10 (degs) to 35 (degs) C (50 (degs) to 95 (degs) F)
               at 0 m to 2133 m (0 feet to 7000 feet)
Power Off:  10 (degs) to 43 (degs) C (50 (degs) to 110 (degs) F)
Relative Humidity:  8% to 80%
Wet Bulb:  22.8 (degs) C (73 (degs) F)
ELECTRICAL POWER:
Power Supply:  133 watts
Dual Power Input (Auto Sense):
    100 to 125 V ac (nominal), 50/60 Hz
    200 to 240 V ac (nominal), 50/60 Hz.
Btu Output:
    151 Btu/hr (base unit)
    649 Btu/hr (maximum configuration)
Altitude:  2133 m (7000 feet) maximum
Declared Acoustical
  Noise Emissions:  LWAd = 5.0 bels (1)
 (1) The noise emission level stated is the declared (upper limit)
   sound power level in bels, for a random sample of machines,
   typically configured and operating in idle mode.  That is, powered
   on, but no optional read/write storage device and computer or I/O
   activity.
AGENCY APPROVALS:
    FCC -- Certified to comply with part 15 FCC Rules,
       Class B limits
    CSA C22.2  No. 950
    UL -- 1950, 1st Edition
MACHINE REQUIREMENTS:  The IBM 3550 Model 002 is designed to work
with the IBM ThinkPad 700 PS/2 and the IBM ThinkPad 700C PS/2.  The
IBM 3550 Model 002 will support installation or attachment of the
following products.
CONNECTIVITY OPTIONS
FEATURE     PART
NUMBER      NUMBER     DESCRIPTION
1007        6451007    5.25-inch Diskette Adapter/A
1091        6451091    PS/2 Adapter/A for Ethernet Networks
1136        6451136    PS/2 Adapter/A for Twisted-Pair
                         Networks
1014        6451013    PS/2 Dual Async Adapter/A
2000        74F3465    The IBM 3270 Connection
6279        69X6279    IBM System/36/38 Workstation
                         Emulation Adapter
FEATURE     PART
NUMBER      NUMBER     DESCRIPTION
1223        1501223    IBM PC Network Baseband
                         Adapter/A
1222        1501222    IBM PC Network Adapter II/A
5647        96X5647    IBM PC Network Adapter II/A --
                         Frequency 2
5648        96X5648    IBM PC Network Adapter II/A --
                         Frequency 3
4790        69X8138    IBM Token-Ring Network Adapter/A
8881        25F8887    IBM Token-Ring Network Adapter/A --
                         Remote Program Load
0149        74F9410    IBM Token-Ring Network 16/4
                         Adapter/A
5130        74F5130    IBM Token-Ring Network 16/4
                         Trace and Performance Adapter/A
1755        94X1755    PS/2 300/1200/2400 Internal Modem/A
5887        75X5887    XGA (R) Display Adapter/A
2561        87F4773    PS/2 XGA-2 Display Adapter/A
1991        95F1091    M-Motion Video Adapter (2)
4007        75X5889    Video Memory Expansion Option
2784        34F2784    Audio Capture/Playback Adapter/A
3909        87F9909    M-Audio Capture/Playback Adapter/A
2785        34F2785    Video Capture Adapter/A
9732        69F9732    Action Media II Display Adapter/A 2MB (3)
9734        69F9734    Action Media II Display Adapter
                         Capture Option
 (R) Registered trademark of International Business Machines
   Corporation.
 (2) Supported only when ThinkPad 700C is installed and when the card
   is installed in the upper card slot.  This combination provides

   Auxiliary Video Extension (AVE) support.
 (3) Only one adapter is allowed per unit.  When it is installed, the
   other card socket must remain empty.
CABLE OPTIONS
FEATURE     PART
NUMBER      NUMBER     DESCRIPTION
0217        6450217    IBM Serial Adapter Cable
0242        6450242    IBM Serial Adapter Connector
2067        1502067    IBM Communications Adapter Cable
5612        1525612    IBM Printer Adapter Cable
3390        6339098    IBM Token-Ring PC Adapter Cable
1227        1501227    Baseband Cable
1228        1501228    IBM PC Network Baseband General
                         Purpose Cable
1229        1501229    IBM PC Network Baseband Adapter
                         Cable
0230        6450230    IBM PC Network Base Expander Kit
0231        6450231    IBM PC Network Short Distance Kit
0232        6450232    IBM PC Network Medium Distance Kit
0233        6450233    IBM PC Network Long Distance Kit
0234        6450234    IBM PC Network 25-Foot Cabling
                         Segment
0235        6450235    IBM PC Network 50-Foot Cabling
                         Segment
0236        6450236    IBM PC Network 100-Foot Cabling
                         Segment
0237        6450237    IBM PC Network 200-Foot Cabling
                         Segment
6293        69X6293    IBM System/36/38 Workstation
                         Emulation Cable
1140        6451139    PS/2 Card to Option Cable
1042        6451042    PS/2 Option to Option Cable
6321        16F1865    Baseband Network Option X.21
STORAGE OPTIONS
FEATURE     PART
NUMBER      NUMBER     DESCRIPTION
Hard Disk Drive
1045        6451045    80MB SCSI Fixed Disk Drive
1046        6451046    160MB SCSI Fixed Disk Drive
1242        6451242    200MB SCSI Fixed Disk Drive
1108        6451234    320MB SCSI Fixed Disk Drive
1081        6451235    400MB SCSI Fixed Disk Drive
Internal CD-ROM
1113        6451113    5.25-inch CD-ROM Drive
                         (600MB 5.25-inch HH)
                         (Withdrawn)
1104        6451104    5.25-inch CD-ROM XA Drive
                         (600MB 5.25-inch HH)
Internal Read/Write Optical Drive
0162        6450162    3.5-inch Rewritable Optical Drive
3780        49G2670    Optical Drive Bezel Kit (4)
 (4) Required when installing feature number 0162 (6450162)
   in the IBM 3550.
External CD-ROM Drive
            3510001    External CD-ROM Drive 3510-001
                         (Withdrawn)
External SCSI Enclosure
            35100V0    External SCSI Enclosure 3510
            3511003    External Storage Enclosure for SCSI
                         Devices 3511-003
Tape
            3532023    2.3GB, External SCSI Tape
                         Drive 3532-023
External Diskette Drive
            4869001    5.25-inch 360KB External
                         Diskette Drive
            4860002    5.25-inch 1.2MB External
                         Diskette Drive
PS/2 DISPLAYS AND ADAPTERS
FEATURE     PART
NUMBER      NUMBER     DESCRIPTION
                       8511 Color Display
                       8512 Color Display
                       8513 Color Display
                       8514 Color Display (5), (7)
                       8515 Color Display (6)
                       8516 Touch Display (6)
                       8518 Color Display
                       9515 Color Display
                       9518 Color Display
5887        75X5887    XGA Display Adapter/A
2561        87F4773    PS/2 XGA-2 Display Adapter/A
 (5) When attached to the IBM 3550 VGA port, only VGA-mode is
   supported.  When attached to the XGA Adapter/A, high resolution
   mode is supported.
 (6) When attached to the IBM 3550 VGA port, only VGA-mode is
   supported.  When attached to the XGA Adapter/A or XGA-2 Adapter/A,
   XGA-mode is supported.
 (7) The 8514/A adapter is not supported by the IBM 3550.
PRINTERS
FEATURE     PART                                       MACHINE
NUMBER      NUMBER     DESCRIPTION                     TYPE/MODEL
                       PagePrinter                     3812-001
                       PagePrinter                     3816-01D/01S
                       Color Jetprinter                3852-002
                       LaserPrinter                    4019-001
                       LaserPrinter                    4019-E01
                       Ink-Jet Printer                 4070-001
                       Ink-Jet Printer                 4070-002
                       ExecJet (R) Printer             4072
                       Proprinter (R)                  4201-001
                       Proprinter II                   4201-002
                       Proprinter III                  4201-003
                       Proprinter XL                   4202-001
                       Proprinter II XL                4202-002
                       Proprinter III XL               4202-003
                       Proprinter X24                  4207-001
                       Proprinter X24E                 4207-002
                       Proprinter XL24                 4208-001
                       Proprinter XL24E                4208-002
                       Personal PagePrinter            4216-030
                       Quietwriter (R)                 5201-001
                       Quietwriter                     5201-002
                       Quietwriter III                 5202-001
                       Quickwriter (R)                 5204-001
                       PS/1 (R) Printer                2205-001
                       Personal Printer
                         Series II                     2380-001
                       Personal Printer
                         Series II                     2381-001
                       Personal Printer
                         Series II                     2390-001
                       Personal Printer
                         Series II                     2391-001
                       LaserPrinter 5E                 4029-010
                       LaserPrinter 6                  4029-020
                       LaserPrinter 6P                 4029-022
                       LaserPrinter 10                 4029-030
                       LaserPrinter 10L                4029-040
                       LaserPrinter 10P                4029-042
                       Printer                         4226-302
                       Portable Printer                5183-010/020
 (R) Registered trademark of International Business Machines
   Corporation.
PLOTTERS, SCANNERS, EXTERNAL MODEMS
FEATURE     PART
NUMBER      NUMBER     DESCRIPTION
                       6180 Color Plotter
                       6182 Auto Sheet Feed Plotter
                       6184 Color Plotter
                       6185 Color Plotter
                       6186 Color Plotter Models 1 and 2
                       6187 Color Plotter Models 1 and 2
                       7372 Color Plotter
                       7374 Color Plotter
                       7375 Color Plotter Models 1 and 2
                       3119 Scanner
5442        94X2415    3119 Scanner Adapter/A
                       2400 Baud Modem  5853
                       2400 Baud Modem  5858
OTHER DEVICES
FEATURE     PART
NUMBER      NUMBER     DESCRIPTION
8770        6450350    IBM Personal System/2 Mouse
5443        07G0033    IBM Personal System/2
                         Miniature Mouse
5445        07G0032    IBM Personal System/2
                         Numeric Keypad
5003        1501224    Data Migration Facility
SPECIAL NEEDS PRODUCTS
These products have no feature numbers and are supported by IBM
Teleservice and Customer Support only.

PART
NUMBER         DESCRIPTION
6450616        Screen Reader (TM) (Withdrawn)
6024937        IBM Screen Reader Braille Publication
                 (Withdrawn)
41G8686        SpeechViewer (TM) Version 1.1
92F2666        IBM VoiceType Version 1.0
 (TM) Trademark of International Business Machines Corporation.
PROGRAMMING REQUIREMENTS:  The IBM 3550 Model 002 supports the
following software:
OPERATING SYSTEMS
o   IBM DOS Version 5.0
o   IBM OS/2 Version 2.00.1 (8)
o   IBM OS/2 LAN Server Entry Version 3.0
o   IBM OS/2 LAN Server Entry Advanced Version 3.0
o   IBM Extended Services for OS/2 Version 1.0
o   IBM Extended Services with Database Server for OS/2
 (8) OS/2 2.00.1 is an updated version designated to support the IBM
   ThinkPad 700 and 700C.  This is not a generally available version
   and can only be obtained by calling 800-342-6672.  The machine
   type and machine serial number must be provided.
The IBM 3550 Model 002 supports the following software:
IBM COMMUNICATIONS
o   IBM PC 3270 Emulation Program, Entry Level Version 2.0
o   IBM Personal Communications/3270 Version 3.0
o   IBM PC LAN Program Version 1.34
o   IBM LAN Support Program Versions 1.12 and 1.2
o   IBM Token-Ring Network Bridge Program Version 2.1
o   IBM Token-Ring Trace and Performance Program Version 2.0
o   IBM PC Network Bridge Program Version 1.0
o   IBM APPC/PC Version 1.11
LIMITATIONS:
o   Action Media II Display Adapter/A card:  If the Action Media II
    Display Adapter/A card (#9732, 69F9732) is installed in the IBM
    3550, no other feature card can be installed in the unit, because
    of power limitations at the card slots.
o   Auxiliary Video Extension (AVE):  The upper card slot provides
    AVE support only when using the ThinkPad 700C.  The lower card
    slot does not support AVE.
o   8514 Color Display:  If the 8514 Color Display is connected to
    the unit, the following restrictions apply:
    -   If attached to the IBM 3550 VGA port, only VGA mode is
        supported.  If attached to the XGA Display Adapter/A card
        (#5887, 75X5887), high resolution mode is supported.
    -   The 8514/A Adapter card is not supported by the IBM 3550.
o   8515 and 8516 Color Displays:  If one of these color displays is
    connected to the unit, the following restriction applies:
    -   When attached to the IBM 3550 VGA port, only VGA mode is
        supported.  When attached to the XGA Display Adapter/A card
        (#5887, 75X5887) or the XGA-2 Display Adapter/A card (#2561,
        87F4773), XGA mode is supported.
o   9515 and 9518 Color Displays:  If one of these color displays is
    connected to the unit, the following restriction applies:
    -   These displays require connection to the XGA-2 Display
        Adapter/A card (#2561, 87F4773) to display XGA mode.
o   Display Stand:
    -   If the display stand shipped with the IBM 3550 is used, the
        keyboard of the attached system becomes inaccessible.
        Therefore, an external keyboard becomes a requirement.  The
        customer is responsible for obtaining the keyboard.
    -   The maximum allowable weight to be placed on the display
        stand is 19 kg (41.9 pounds).
o   Internal Rewritable Optical Drive:
    -   When installing the Rewritable Optical Drive (#0162,
        6450162), the Optical Drive Bezel Kit (#3780, 49G2670) is
        required.
PLANNING INFORMATION
CABLE ORDERS:  No cables required.
INSTALLABILITY:  The IBM 3550 Expansion Unit Model 002 requires about
15 minutes for installation.  Installation includes unpacking and
setting up the unit, installing the computer and turning the unit on.
Additional time is required to install options (adapter options and
storage options).
       By following the setup instructions, the user unpacks the
carton, sets up the computer using the Option Diskette, attaches any
external devices, installs the computer into the unit, and turns on
power.
       After the power-on self tests of the computer, the user is
guided through configuring the computer and the expansion unit, using
the automatic configuration program.
PROBLEM DETERMINATION:  The IBM 3550 does not have self-diagnostic
capability.  It is always diagnosed with a computer attached.
       If a failure is found, an instruction or error code will
appear on the computer's screen or external display (if attached).
The user should note this information and refer to the Installation
and Operating Instructions supplied with the unit.
       The user is first requested to detach the computer and test
the computer to isolate problems to the computer or expansion unit.
If no computer problems are detected, the computer is reinstalled
into the expansion unit and trouble shooting continues for the
expansion unit.
       The trouble shooting procedures consist of a power-on
self-test, diagnostics test and trouble shooting charts designed to
assist the user in isolating a defective machine element.
       Operating instructions and diagnostic procedures, which are
included with supported options (adapter options, storage device
options), help the customer in isolating any defective machine
element.
       If expansion unit problems are identified, the user will be
instructed to have the expansion unit serviced with the same computer
to enable the service personnel to service the user's specific
configuration.  The failing element can then be replaced or repaired
under existing warranty or service provisions.
PACKAGING:
                                                           NUMBER OF
PRODUCT               CONTENTS                               BOXES
IBM 3550/002          IBM 3550 Expansion Unit                  1
                      Power Cord -- 6 feet (8)
                      Publication Package (8)
                      -- Installation and
                        Operating Instructions
                      -- System Programs
                        License Agreement
                      -- Option Diskette (1MB)
 (8) The shipment group contains a U.S. power cord (6 feet) and the
   Publication Package documentation is in U.S. English.
SECURITY, AUDITABILITY AND CONTROL
       Security and auditability features of this product are:
o   Cover lock -- access to the internals of the unit are protected
    by a key lock.  This prohibits unauthorized personnel access to
    any storage media and adapter cards installed.
o   System lock -- key holders have the ability of locking the
    notebook system into the IBM 3550 if they intend to leave it
    unattended.  This prevents unauthorized removal of the system
    unit from the expansion unit.
o   Key controlled power -- power to the expansion unit can be
    controlled by a key holder.  This means, one key position allows
    power to the unit whenever the power switch is activated and
    another position prohibits power to the switch without having a
    key.
o   Tie down capability -- this feature allows the owner to
    physically attach the unit to a desk, table, or similar fixture.
    A built-in security hook, located at the rear of the unit, allows
    the connection of a chain or cable to the unit.
       User management is responsible for evaluation, selection and
implementation of security features, administrative procedures and
appropriate controls in application systems and communications
facilities.
TERMS AND CONDITIONS
VOLUME DISCOUNT:  Volume purchasing is not available under the Volume
Discounts section of the IBM Customer Agreement (ICA).
IBM CREDIT CORPORATION FINANCING:  Term leases and installment
payment plans are available for commercial and state and local
government customers.
CUSTOMER FULFILLMENT OPTION APPLIES:  Yes.
WARRANTY PERIOD:  One year.
WARRANTY SERVICE:  Customer Carry-In Repair (CCR).
ALTERNATIVE SERVICE:  IBM On-Site Repair (IOR).
MAINTENANCE SERVICE:  IOR.
IBM HOURLY SERVICE RATE CLASSIFICATION:  One.

       IBM Warranty Service, Maintenance Service or IBM Hourly
Service may be obtained by calling 800-IBM-SERV (426-7378).  IBM
Hourly Service is available at the applicable rate and terms,
including element exchange price if applicable.
VOLUME MAINTENANCE OPTION:  The announced product is an eligible
machine and a qualifying machine for the Volume Maintenance Option*
of the ICA.
MID-RANGE SYSTEM OPTION:  The announced product is an eligible
machine for the Mid-Range System Option* of the ICA.
ELIGIBLE                          DISCOUNT
TYPE                     THREE-YEAR      FIVE-YEAR
3550                        17%             22%
CORPORATE SERVICE OPTION:  The announced product is an eligible
machine for the Corporate Service Option* of the ICA.
                                  DISCOUNT
                         THREE-YEAR      FIVE-YEAR
Network                     25%             30%
System                      17%             22%
EXTENDED MAINTENANCE OPTION:  The announced product is an eligible
machine for the Extended Maintenance Option* of the ICA.
CENTRAL FACILITY MAINTENANCE SERVICE OPTION:  The announced product
is an eligible machine for Central Facility Maintenance Service
Option* of the ICA.
       A minimum number of six machines is required at the central
facility before requesting maintenance service.  The Additional
Maintenance Charge Factor is currently 0.5 hours.  The terms and
conditions are stated in the Attachment for Central Facility
Maintenance Service Option.
*  A revised exhibit will be available at a later date.
PRODUCT AVAILABILITY STATUS:  New product available.
CUSTOMER SETUP:  Yes.
LICENSED INTERNAL CODE:  No.
IBM EDUCATION ORDER CENTER:  This product is available for ordering
through the IBM Education Order Center.  Availability through the
Education Order Center may not coincide with the product availability
dates in other sections of this document.
       The IBM Education Order Center is the order processing
location for selected personal computers and related
hardware/software for eligible education end users.  Eligible end
users are defined as faculty and staff members of qualified
kindergarten through twelfth grade educational institutions and
students, faculty and staff members of higher educational
institutions that have an education product coordinator.
NATIONAL EDUCATION PRICE (NEP):  A National Education Price is
available under the terms and conditions of the National Education
Price Exhibit.  The NEP price, which represents 17.6% discount from
the single unit purchase price, is not subject to any further
discount or allowance.  The machine in this announcement is included
in the National Education Price Exhibit.
CHARGES
PRODUCT CHARGES
MACHINE TYPE/MODEL:  3550-002
                              FEATURE     PART         PURCHASE
DESCRIPTION                   NUMBER      NUMBER       PRICE
Expansion Unit                            3550002      $895
Optical Drive
  Bezel Kit                   3780                       55
WARRANTY OPTION UPGRADE CHARGE:
           WARRANTY                      WARRANTY
            OPTION                        OPTION
           UPGRADE                       UPGRADE
           FROM  TO                       CHARGE
          CCR   IOR                        $17
ANNUAL MINIMUM MAINTENANCE CHARGES:
            ANNUAL                        ANNUAL
           MINIMUM                   CENTRAL FACILITY
         MAINTENANCE                   MAINTENANCE
            CHARGE                       SERVICE
            (IOR)                         (CFMS)
             $100                          $95

      (CORRECTED ON OCTOBER 6, 1992)
       Under the heading Product Positioning, the first sentence has
been changed to read as follows:
       The IBM 3550 Expansion Unit Model 002 is for users of the IBM
ThinkPad 700 PS/2 or the IBM ThinkPad 700C PS/2, who desire
simplified connections to peripheral equipment, additional expansion
capability and a familiar desktop environment.