IBM PS/2 35 SX Owner's manual

FRONT
PICTURE 1
IBM PS/2 Models 35SX and 35LS
Hardware Maintenance Reference
March 17, 1992
Part Number 10G6620
Form Number S84F-9845-02
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
¦ Copyright IBM Corp. 1991, 1992
FRONT - 1

EDITION Edition Notice
Safety Information
Refer to the Hardware Maintenance Reference General Information
pamphlet in this manual for the following safety information:
General Safety
Electrical Safety.
Third Edition (March 1992)
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¦ Copyright International Business Machines Corporation 1991, 1992.
All rights reserved.
Note to U.S. Government Users -- Documentation related to restricted
rights -- Use, duplication or disclosure is subject to restrictions
set forth in GSA ADP Schedule Contract with IBM Corp.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Edition Notice
¦ Copyright IBM Corp. 1991, 1992
EDITION - 1

FRONT_1 Notices
References in this publication to IBM products, programs, or services do
not imply that IBM intends to make these available in all countries in
which IBM operates. Any reference to an IBM product, program or service
is not intended to state or imply that only IBM's product, program, or
service may be used. Any functionally equivalent product, program, or
service that does not infringe any of IBM's intellectual property rights
or other legally protectible rights may be used instead of the IBM
product, program, or service. Evaluation and verification of operation in
conjunction with other products, programs, or services, except those
expressly designated by IBM, are the user's responsibility.
IBM may have patents or pending patent applications covering subject
matter in this document. The furnishing of this document does not give
you any license to these patents. You can send license inquiries, in
writing, to the IBM Director of Commercial Relations, IBM Corporation,
Purchase, NY 10577.
The following terms, denoted by an asterisk (*) in this publication, are
trademarks of the IBM Corporation in the United States and/or other
countries:
IBM
Personal System/2
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Notices
¦ Copyright IBM Corp. 1991, 1992
FRONT_1 - 1

CONTENTS Table of Contents
EDITION Edition Notice
FRONT_1 Notices
CONTENTS Table of Contents
1.0 Product Description
1.1 Security
1.2 System-Board Features
2.0 Option Compatibility
2.1 Incompatible Adapters
2.2 Hard Disk and Diskette Drives
2.3 Terminators
2.4 Drive and Diskette Compatibility
3.0 Operating Requirements
3.1 Power Supply
3.2 Power-On Self-Test (POST)
3.3 System Memory
4.0 Specifications
5.0 Special Tools
6.0 Removals and Replacements
6.1 1005 Cover
6.2 1010 Adapters
6.3 1015 Bus Adapter
6.4 1020 Hard Disk Drive
6.5 1025 Diskette Drive and Second Drive Bezel
6.6 1030 Cover Lock Assembly
6.7 1035 Real-Time Clock Module
6.8 1040 Power Supply
6.9 1045 Math Coprocessor
6.10 1050 Memory Module Kits
6.11 1055 System Board
6.12 1060 Control Assembly
6.13 1065 Retainer Plate
6.14 1070 Adapter Guide
7.0 Locations
7.1 Front View
7.2 Rear View
7.3 Interior View
7.4 System Board
7.5 Safety Label
8.0 Grounds
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Table of Contents
¦ Copyright IBM Corp. 1991, 1992
CONTENTS - 1

1.0 Product Description
The IBM (*) Personal System/2 (*) Model 35 computers have the following
features:
Security
- Cover lock
- Power-on password
- Keyboard password
- Bolt down capability
System board
- 20-MHz microprocessor (See "Microprocessor" in topic 1.2.1)
- 128KB (KB equals 1024 bytes) of read-only memory (ROM)
- Connector for a 80387SX or equivalent math coprocessor
- A minimum of 2MB (MB equals 1,048,576 bytes) random access memory
(RAM) expandable to 16MB on the system board
- 64 bytes of complementary metal-oxide semiconductor random access
memory (CMOS RAM)
- Read-only memory basic input/output system (ROM BIOS)
- 16-bit VGA graphics controller (See page 1.2.4.)
- Bus Adapter with three 16-bit expansion slots
- Serial port
- Parallel port
- Diskette-drive connector
- Keyboard connector
- Pointing-device connector
- Display connector for 16-bit video graphics array (VGA) controller
- Hard disk drive (fixed disk drive) cable connector.
Power supply
- Automatically switches to the 100-125 V ac or the 200-240 V ac
range
- 50 or 60 Hz
- 118 watts.
Speaker
Keyboard
- Space Saving Keyboard
- PS/2 (*) Enhanced Keyboard
- PS/2 Host Connected Keyboard.
Diskette drive support (see "Hard Disk and Diskette Drives" in
topic 2.2)
Hard disk drive support (see "Hard Disk and Diskette Drives" in
topic 2.2).
(*) IBM, Personal System/2, and PS/2 are trademarks of the
International Business Machines Corporation.
Subtopics
1.1 Security
1.2 System-Board Features
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Product Description
¦ Copyright IBM Corp. 1991, 1992
1.0 - 1

1.1 Security
Subtopics
1.1.1 Cover Lock
1.1.2 Power-On Password
1.1.3 Bolt Down Capability
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Security
¦ Copyright IBM Corp. 1991, 1992
1.1 - 1

1.1.1 Cover Lock
The cover lock is located on the bottom front-left of the system unit and
can be unlocked with the user's key.
If the keys for the cover lock are lost, a new cover lock assembly can be
ordered (see the parts section in the Hardware Maintenance Service
pamphlet). The new cover lock assembly contains two keys.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Cover Lock
¦ Copyright IBM Corp. 1991, 1992
1.1.1 - 1

1.1.2 Power-On Password
A power-on password denies access to the system when the system is
powered-on.
To service a system with an active and unknown power-on password:
1. Power-off the system.
2. Reposition the password-override connector (J14) by lifting it
straight up. (See page 7.4 for the connector location.)
- If the jumper covers the first and second pins, move it so
that it covers the second and third pins.
- If the jumper covers the second and third pins, move it so
that it covers the first and second pins.
Note: Once you have moved the jumper to the new position, leave it in
that position until the next time you need to reset the
password.
To reactivate the power-on password:
1. Insert the Starter Diskette into the drive and power-on the
system.
2. Select the Set features option from the Main Menu, and follow the
instructions.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Power-On Password
¦ Copyright IBM Corp. 1991, 1992
1.1.2 - 1

1.1.3 Bolt Down Capability
The bolt-down feature allows the computer to be attached to a table or
desk. (See page 7.2 for the bolt-down holes.)
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Bolt Down Capability
¦ Copyright IBM Corp. 1991, 1992
1.1.3 - 1

1.2 System-Board Features
The major features of the system board are:
20-MHz microprocessor
Math coprocessor connector
CMOS RAM
16-bit VGA graphics controller
Serial port
Parallel port
Keyboard connector
Diskette-drive controller
Pointing-device (mouse) connector.
Subtopics
1.2.1 Microprocessor
1.2.2 CMOS RAM
1.2.3 ROM BIOS
1.2.4 16-bit VGA Graphics Controller
1.2.5 Serial Port
1.2.6 Parallel Port
1.2.7 Diskette-Drive Controller
1.2.8 Keyboard Connector and Pointing-Device Connector
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
System-Board Features
¦ Copyright IBM Corp. 1991, 1992
1.2 - 1

1.2.1 Microprocessor
The Model 35 SX and 35 LS use an 80386SX microprocessor; the Model 35 SLC
uses an IBM386 SLC microprocessor, a high-performance 80386-compatible
microprocessor with 8KB of internal cache memory. Both microprocessors
have a 32-bit internal bus with a 16-bit external data bus and a 24-bit
external address bus. Both operate in two modes: real-address and
virtual-address (protected) mode. The processor speed is 20 MHz.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Microprocessor
¦ Copyright IBM Corp. 1991, 1992
1.2.1 - 1

1.2.2 CMOS RAM
The CMOS RAM provides 64 bytes of storage. The real-time clock uses the
first 14 bytes to track the date, time, and battery level. The remaining
50 bytes are used to store system-configuration and security information.
The data stored in CMOS RAM is kept active by the battery when the system
is powered-off. If the stored data is lost due to a depleted or removed
battery, the data can be restored by using the Starter Diskette to allow
the automatic configuration program to run. The data also can be restored
by using the restore configuration program on the user's backup copy of
the Starter Diskette.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
CMOS RAM
¦ Copyright IBM Corp. 1991, 1992
1.2.2 - 1

1.2.3 ROM BIOS
ROM BIOS contains the instructions and routines that control the keyboard,
diskette drives, hard disk drive, displays, and other major input/output
devices in the system. Some adapters have their own ROM modules
containing extended BIOS routines that work with the system board ROM
BIOS. The routines for performing the power-on self-test (POST) are also
contained in the ROM BIOS.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
ROM BIOS
¦ Copyright IBM Corp. 1991, 1992
1.2.3 - 1

1.2.4 16-bit VGA Graphics Controller
A 16-bit VGA graphics controller is on the system board. The controller
supports color and monochrome analog direct drive displays in a variety of
modes, including alphanumeric text mode and all-points-addressable (APA)
graphics mode.
The controller supports a maximum of 720 x 400 picture elements (PELs) in
the text mode and a maximum of 640 x 480 PELs in graphics mode. The
16-bit VGA graphics controller can support up to 256 colors or 64 shades
of gray at one time. Main frame interactive (MFI) modes 2, 3, 4, and 5
are also supported. Composite video is not supported.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
16-bit VGA Graphics Controller
¦ Copyright IBM Corp. 1991, 1992
1.2.4 - 1

1.2.5 Serial Port
The serial port is fully programmable and supports asynchronous
communications. The 25-pin, D-shell connector provides the signals to
drive a device with a standard 25-contact, RS-232 connector. The
connected device is identified (addressed) by the system configuration as
either Serial 1 (primary) or Serial 2 (alternate).
If an option adapter with a serial port is installed in the system, it
should be set to Serial 2.
Note: Conflicts occur when using multiple communication lines if two or
more lines are addressed the same.
Select the Set configuration option on the Starter Diskette.
Select View configuration to verify that no lines are addressed the
same.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Serial Port
¦ Copyright IBM Corp. 1991, 1992
1.2.5 - 1

1.2.6 Parallel Port
The parallel port allows the attachment of devices that accept eight bits
of parallel data at standard transistor-transistor-logic (TTL) levels.
The port has a 25-pin, D-shell connector and is designed primarily for
printers. However, the port can be used as a general input/output port
for any device or application that matches its input/output capabilities.
The connected device is identified (addressed) by system configuration as
Parallel 1, Parallel 2, or Parallel 3.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Parallel Port
¦ Copyright IBM Corp. 1991, 1992
1.2.6 - 1

1.2.7 Diskette-Drive Controller
The controller connects to the diskette drive(s) through a single 40-pin
connector on the system board. Signals and voltages are supplied through
the diskette-drive cable that plugs into the connector.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Diskette-Drive Controller
¦ Copyright IBM Corp. 1991, 1992
1.2.7 - 1

1.2.8 Keyboard Connector and Pointing-Device Connector
The two 6-pin connectors at the rear of the system board are for
connecting a keyboard and a pointing device (mouse). The keyboard
connector is marked with a small keyboard figure molded into the back
panel; the unmarked connector is for the pointing device. The interface
logic does not allow the keyboard and the pointing device to be
interchangeable.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Keyboard Connector and Pointing-Device Connector
¦ Copyright IBM Corp. 1991, 1992
1.2.8 - 1

2.0 Option Compatibility
Subtopics
2.1 Incompatible Adapters
2.2 Hard Disk and Diskette Drives
2.3 Terminators
2.4 Drive and Diskette Compatibility
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Option Compatibility
¦ Copyright IBM Corp. 1991, 1992
2.0 - 1

2.1 Incompatible Adapters
Certain adapters are not compatible when used in the same system. If one
of the following adapters is installed, the other adapters listed cannot
be installed in the same system unit:
Synchronous Data Link Control (SDLC) Adapter
3278 - 3279 Emulation Adapter.
Problems can occur in the system when adapters share the same interrupt
level. Check the adapter interrupt levels to ensure that they do not
conflict. If the adapters have selectable interrupt levels, verify that
the jumpers on the adapters are not set for the same level.
Some adapters are not supported by the Model 35 computers. Supported
option adapters are listed in the parts section of the Hardware
Maintenance Service pamphlet.
IBM PS/2 Model 35 SX, 35 LS, 35 SLC HMR
Incompatible Adapters
¦ Copyright IBM Corp. 1991, 1992
2.1 - 1