                                                                     Page:    1


DATE       10/30/90

TITLE      IBM PERSONAL SYSTEM/2 EXTERNAL STORAGE ENCLOSURE FOR SCSI DEVICES
ABSTRACT          The Personal System/2 (R) (PS/2 (R)) External Storage
           Enclosure for Small Computer System Interface (SCSI) Devices
           Model 003 (3511-003) is a floor-standing expansion unit, similar in
           appearance to the PS/2 Model 95, that can attach to a PS/2 Micro
           Channel (R) system with either a PS/2 Micro Channel SCSI Adapter or a
           PS/2 Micro Channel SCSI Adapter with Cache installed.  The unit comes
           standard with a PS/2 320MB SCSI Fixed Disk Drive (320 million bytes)
           and can be populated with a maximum of seven internal SCSI devices,
           such as fixed disk drives, a CD-ROM Drive or a tape drive.
                  Availability Date:  October 30, 1990.
            (R) Registered trademark of International Business Machines
              Corporation.
PRODNO       3511
OVERVIEW   HIGHLIGHTS
           o   Provides customers with the capability to tailor their system
               configuration to meet expanding application requirements
           o   Adhering to the industry standard SCSI interface provides a high
               degree of hardware and software compatibility
           DESCRIPTION
           GROWTH ENABLEMENT
           The PS/2 External Storage Enclosure for SCSI Devices provides
           customers with additional expansion capabilities for their PS/2 Micro
           Channel desktop and floor-standing systems.  Customers now have the
           capability to add many and varied SCSI storage devices, when it is
           not practical or possible to install internal SCSI devices.  These
           SCSI storage devices include SCSI fixed disk drives, a CD-ROM drive
           and a SCSI tape drive.  PS/2 SCSI storage options adhere to the
           industry standard SCSI interface, maintaining a high degree of
           hardware and software compatibility.  The SCSI enclosure ensures that
           customers can tailor their system configuration to meet expanding
           application requirements.
           STATEMENT OF DIRECTION:  IBM intends to support the PS/2 External
           Storage Enclosure for SCSI Devices attached to the PS/2 Models 8555
           (061 only), 8565, 8570, 8573 (061 and 121), 8580, 8590 and 8595 with
           the Advanced Interactive Executive Personal System/2 (AIX (R) PS/2).
            (R) Registered trademark of International Business Machines
              Corporation.
CUSTINFO   PUBLICATIONS
                  The following publication is shipped with the product:
                                                ORDER             PART
           TITLE                                NUMBER            NUMBER
           Quick Reference                      S15F-2159         15F2159
                  The following publications are available.  To order, contact
           your IBM representative.
                                                ORDER             PART
           TITLE                                NUMBER            NUMBER
           HMR                                  S15F-2158         15F2158
           HMS Supplement                       S15F-2234         15F2234
           EDUCATION SUPPORT
                  All educational self-study and classroom materials are
           available under the system support area.
                  Telephone IBM Direct -- Education at 1-800-426-2468, for
           schedules, enrollments and orders for self-study courses.
           SCHEDULE
                  The planned availability date is October 30, 1990.
TECHINFO   TECHNICAL INFORMATION
           SPECIFIED OPERATING ENVIRONMENT
           PHYSICAL SPECIFICATIONS:  The PS/2 External Storage Enclosure for
           SCSI Devices has two 3.5-inch half-high bays, one 5.25-inch half-high
           bay, and two 5.25-inch full-high bays.  The 5.25-inch full-high bays
           include two removable 3.5-inch half-high SCSI device mounting trays
           installed in each bay.  These trays provide the capability to install
           two 3.5-inch half-high SCSI devices in each 5.25-inch full-high bay
           bringing the total number of installable internal SCSI devices to
           seven.  The maximum number of internal/external SCSI devices
           supported by a PS/2 SCSI adapter, including the SCSI devices
           installed in the external storage enclosure, is seven.  The maximum
           number of external storage enclosures attached to a PS/2 system with
           four PS/2 SCSI adapters installed is four.  These devices must meet
           the American National Standard Institute (ANSI) SCSI standard
           (X3.131-1986) for single-ended devices.
                  The PS/2 320MB SCSI Fixed Disk Drive is a SCSI fixed disk
           drive that features 320MB of formatted capacity, 64KB look ahead
           buffer, 12.5ms average access time, synchronous SCSI mode operation,
           3.5-inch half-high form factor and complies to the SCSI for single
           ended devices.
                  The PS/2 External Storage Enclosure for SCSI Devices is
           intended for use as a floor-standing device and is designed to
           operate in a vertical position only.
           Width:         203.2mm (8.0 inches)
           Depth:         508mm (20.0 inches)
           Height:        501mm (19.75 inches)
           Weight:        21.8kg (48 pounds)
                            (minimum configuration)
           Equipment Approvals and Safety:
             FCC Class A
             VCCI Class 1
             GOP Class B
           Medical Environment:
                  The PS/2 External Storage Enclosure for SCSI Devices will not
           exceed the current leakage requirements established by the National
           Fire Protection Code NFPA76B for data processing use in hospital
           environments.
                  The current leakage of the Storage Enclosure for SCSI Devices
           will not exceed 500 microamps.
                  Please consult local ordinances, the National Fire Protection
           and UL for specific details on use in a hospital environment.
           OPERATING ENVIRONMENT:
           Temperature:             10 (degs) to 35 (degs)C
           Relative Humidity:       8% to 80% (system on)
           MACHINE REQUIREMENTS:  The PS/2 External Storage Enclosure for SCSI
           Devices requires either a PS/2 Micro Channel SCSI Adapter (#1005,
           6451109) or a PS/2 Micro Channel SCSI Adapter with Cache (#1018,
           6451110) plus a PS/2 Card to Option Cable (#1041, 6451041) to connect
           to a PS/2 Micro Channel system.
           PROGRAMMING REQUIREMENTS:  The following operating systems support
           the PS/2 External Storage Enclosure for SCSI Devices:
           o   Operating System/2 (R) (OS/2 (R)) Extended Edition Versions 1.2
               and 1.3 (1)
           o   OS/2 Standard Edition Versions 1.2 and 1.3 (1)
           o   Disk Operating System (DOS) Versions 3.3 and 4.0 (2)
            (R) Registered trademark of International Business Machines
              Corporation.
            (1) OS/2 Version 1.2 supports up to seven SCSI storage devices.
              OS/2 Version 1.3 supports up to 24 SCSI storage devices.
            (2) DOS Versions 3.3 and 4.0 support up to two fixed disks in a
              system.
                     DOS Version 4.0 supports up to seven SCSI storage devices
              when Corrective Service Diskette (CSD) #UR29015 is installed.
              This CSD is also required to support Expanded Memory Support (EMS)
              in DOS Version 4.0.
           COMPATIBILITY:  The PS/2 External Storage Enclosure for SCSI Devices
           is designed to maintain compatibility with the current software
           support that uses the standard defined BIOS interfaces.
           LIMITATIONS:  The PS/2 External Storage Enclosure for SCSI Devices
           can be populated to a maximum of seven SCSI devices.  The maximum
           number of internal/external SCSI devices that can be attached to the
           SCSI adapter, including the PS/2 External Storage Enclosure for SCSI
           Devices, is seven.  The following are some enclosure configuration
           examples:
           o   Five bays can be populated with six additional PS/2 320MB SCSI
               Fixed Disk Drives (#1108, 6451108)
           o   Five bays can be populated with six additional PS/2 80MB or 160MB
               SCSI Fixed Disk Drives (#1045, 6451045) or (#1046, 6451046)
           o   Five bays can be populated with four additional PS/2 60MB or
               120MB SCSI Fixed Disk Drives (#1049, 6451049) or (#1050, 6451050)
               (not in bay A or B)
           o   Two 5.25-inch half-high PS/2 CD-ROM Drives (#1113, 6451113) plus
               four PS/2 320MB SCSI Fixed Disk Drives (#1108, 6451108)
           o   One PS/2 2.3GB Full-High SCSI Tape Drive (#1120, 6451121) in bay
               D plus two additional PS/2 320MB SCSI Fixed Disk Drives (#1108,
               6451108), or two additional PS/2 80MB or 160MB SCSI Fixed Disk
               Drives (#1045, 6451045) or (#1046, 6451046), or two additional
               60MB or 120MB SCSI Fixed Disk Drives (#1049, 6451049) or (#1050,
               6451050) (not in bay A or B).
                  Only one PS/2 2.3GB Full-High SCSI Tape Drive is supported in
           PS/2 Model 3511-003, and only in bay D.
           NOMINAL OPERATING CURRENT:  It is possible to damage the power supply
           or shutdown the system if the total amount of nominal operating
           current required for the devices installed exceeds the available
           current of the power supply in the Storage Enclosure.  The total
           amount of nominal current allowed is 4.6A on the +5V line and 7.5A on
           the +12V line.  The following table lists the nominal operating
           currents for some of the devices that can be installed in the Storage
           Enclosure:
                                                                 PERMITTED
           MEDIA STORAGE               NOMINAL CURRENT           BAY
           DEVICE                   +5V LINE    +12V LINE        LOCATION
           PS/2
             CD-ROM Drive              0.9A          1.7A        E, D (Top)
           60MB SCSI Fixed
             Disk Drive                0.66A         1.0A        E, D (Top)
                                                                 D (Bottom)
                                                                 C (Top)
                                                                 C (Bottom)
           80MB SCSI Fixed             0.5A          0.8A        All
           120MB SCSI Fixed
             Disk Drive                0.66A         1.0A        E, D (Top)
                                                                 D (Bottom)
                                                                 C (Top)
                                                                 C (Bottom)
           160MB SCSI Fixed
             Disk Drive                0.5A          0.8A        All
           320MB SCSI Fixed
             Disk Drive                0.66A         1.0A        All
           2.3GB Full-High
             SCSI Tape Drive           2.0A          0.4A        D
                  Use the following chart to write in and add up the nominal
           operating currents of all the devices installed in the Storage
           Enclosure and compare the totals to the allowed totals.
                                        NOMINAL            NOMINAL
                                        CURRENT            CURRENT
           BAY                          +5V LINE          +12V LINE
             A
             B
             E
             D (Top)
             D (Bottom)
             C (Top)
             C (Bottom)                  0.66A               1.0A
           Total
           Total Allowed Currents         4.6A               7.5A
           USER GROUP REQUIREMENTS:  The announced IBM SCSI option package
           addresses numerous customer requests and satisfies requirements
           submitted by IBM user groups (for example, SHARE, SEAS, GUIDE,
           European G.U.I.D.E. and ASG).
           PLANNING INFORMATION
           CABLE ORDERS:  The PS/2 Card to Option Cable (#1041, 6451041) is a
           60-pin to 50-pin cable required to connect the PS/2 External Storage
           Enclosure for SCSI Devices to either the PS/2 Micro Channel SCSI
           Adapter or the PS/2 Micro Channel SCSI Adapter with Cache.  The cable
           is approximately four feet (1,220mm) in length.
                  The PS/2 Option Interface Terminator, included with the PS/2
           Card to Option Cable, is a 50-pin terminator that is not required
           when a PS/2 External Storage Enclosure for SCSI Devices is attached
           to a PS/2 Micro Channel system.
           NOTE: IBM SCSI products adhere to the ANSI SCSI standard
           (X3.131-1986) for single ended devices.  Single ended implementations
           are limited to a maximum distance of 20 feet (6 meters) between the
           SCSI devices at the end-to-end position on the SCSI bus.  The
           internal SCSI cable, which is 45.6-inches long, is included in the
           20-foot limitation.
           INSTALLABILITY:  The PS/2 External Storage Enclosure for SCSI Devices
           should take about 10 minutes to install.
           PROBLEM DETERMINATION:  The standard system error indications should
           be followed to resolve all problems.
           PACKAGING
           PRODUCT                  SHIPMENT GROUP
           3511-003                 SCSI Enclosure
                                    Quick Reference
                                    Power Cord
           SECURITY, AUDITABILITY AND CONTROL
                  Security and auditability features of the system in which this
           product is attached are:
           o   A mechanical lock to allow the user to lock the system cover
           o   A user-invoked password function used to prevent the use of the
               system by unauthorized persons.
           LIMITATIONS:  SCSI, as defined in the ANSI standard X3.131-1986,
           provides for multiple SCSI adapters (initiators) on the SCSI bus.
           The SCSI bus may be internal or external to the system unit.  The
           PS/2 SCSI adapters are in conformance with this standard and have an
           external port.
                  A data security exposure exists even with Power-On Password
           installed, since external SCSI adapters can attach through the
           external SCSI port and gain undetected read or write access to data
           stored on internal and external SCSI devices.
                  Physical access to the system and external SCSI devices must
           be controlled to limit this exposure.
                  User management is responsible for evaluation, selection and
           implementation of security features, administrative procedures and
           appropriate controls in application systems and communications
           facilities.
ORDERING   TERMS AND CONDITIONS
           VOLUME PURCHASE DISCOUNT:  Volume purchasing is available under the
           Volume Procurement Amendment (VPA) to Agreement for Purchase of IBM
           Machines.  The PS/2 External Storage Enclosure for SCSI Devices is
           included in Category B, Discount Group 1 of the Workstations and
           Related I/O Exhibit (WKSN).
                  Customers with an existing VPA commitment may order the
           announced product as additional quantities to, or as direct
           substitutes for, any other machines in the same category subject to
           availability.  The announced product is included in Category B,
           Discount Group 1 of the revised exhibit.  Since the product is in a
           category that is dependent on another category for its discount,
           customers with an existing VPA with a commitment in Category A may
           order this machine and receive a discount based on the quantity of
           machines committed in this category.
                  For further information regarding volume orders, contact your
           IBM marketing representative.
           IBM CREDIT CORPORATION FINANCING:  Term leases and installment
           payment plans are available for commercial, state and local
           government customers.
           CUSTOMER FULFILLMENT OPTION APPLIES:  Yes.
           ELIGIBLE MACHINE UNDER ALTERNATIVE CERTIFICATION FOR IBM MACHINES:
           No.
           WARRANTY PERIOD:  One year.
           WARRANTY SERVICE:  Customer Carry-In Repair (CCR).
           WARRANTY OPTIONS:  IBM On-Site Repair (IOR).
           IBM MAINTENANCE AGREEMENT:  IBM On-Site Repair (IOR).
           IBM HOURLY SERVICE RATE CLASSIFICATION:  One.
                  IBM Warranty Service, Maintenance Service or IBM Hourly
           Service may be obtained by calling 1-800-IBM-SERV.  IBM Hourly
           Service is available at the applicable rate and terms, including
           element exchange price if applicable.
           VOLUME MAINTENANCE AMENDMENT:  The P/S2 External Storage Enclosure
           for SCSI Devices is an eligible machine under the Volume Maintenance
           Amendment to IBM  Maintenance Agreement.
           MID-RANGE SYSTEM AMENDMENT:  The 3511 is an eligible machine for the
           Mid-Range System Amendment to the IBM Maintenance Agreement.  A
           revised exhibit will be available at a later date.
           ELIGIBLE                       DISCOUNT
           TYPES                THREE YEAR       FIVE YEAR
           3511                    17%              22%
           CORPORATE SERVICE AMENDMENT:  The 3511 is an eligible machine for the
           Corporate Service Amendment to the IBM Maintenance Agreement.  A
           revised exhibit will be available at a later date.
                                          DISCOUNT
           OPTION               THREE YEAR       FIVE YEAR
           Network                 25%              30%
           EXTENDED MAINTENANCE OPTION AMENDMENT:  The announced product is an
           eligible machine for the Extended Maintenance Option Amendment to the
           IBM Maintenance Agreement.  A revised exhibit will be available at a
           later date.
           CENTRAL FACILITY MAINTENANCE SERVICE:  The announced product is an
           eligible machine for Central Facility Maintenance Service (CFMS)
           Amendment to the IBM Maintenance Agreement.  A revised exhibit will
           be available at a later date.
                  The minimum number of machines required to be at the central
           facility before requesting maintenance service is six machines.  The
           Additional Maintenance Charge Factor is currently 0.5 hour.  The
           terms and conditions are stated in the Amendment for Central Facility
           Maintenance Service (Z125-3333) and its Supplement (Z125-3334).
           PRODUCT AVAILABILITY STATUS:  New product available.
           FIELD INSTALLABLE FEATURES/MODEL CONVERSIONS:  Yes.
           CUSTOMER SETUP:  Customer setup allowance is one day.  IBM setup is
           available at the applicable IBM Hourly Service rate and terms.
           LICENSED INTERNAL CODE:  No.
           IBM EDUCATION ORDER CENTER:  This product is available for ordering
           through the IBM Education Order Center.  Please note that
           availability through the Education Order Center may not coincide with
           the product availability dates noted 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 education institutions and
           students, faculty and staff members of higher education 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 40% discount from the
           single unit purchase price, is not subject to any further discount or
           allowance.  The machines in this announcement are included in the
           National Education Price Exhibit.
           CHARGES
           PRODUCT CHARGES:
                                              MODEL/
                                  MACHINE     FEATURE     PART         PURCHASE
           DESCRIPTION            TYPE        NUMBER      NUMBER       PRICE
           PS/2 External
             Enclosure for
             SCSI Devices         3511        003         3511003       $ 6,500
           PUBLICATION CHARGES:
                                              ORDER
           TITLE                              NUMBER                   CHARGE
           HMR                                S15F-2158                 $  4.50
           HMS Supplement                     S15F-2234                    1.50
           WARRANTY OPTION AND MAINTENANCE CHARGES:
                   IBM
                 ON-SITE
                  REPAIR
                  (IOR)
                   $  40
           ANNUAL MINIMUM MAINTENANCE CHARGES:
                   IBM
                 ON-SITE
                  REPAIR
                  (IOR)                CFMS
                   $ 825               $ 784

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