IBM PS/2 65 SX Owner's manual

FRONT
PICTURE 1
March 21, 1990
Part Number 64F3992
Form Number S64F-3992-00
IBM PS/2 Model 65 SX HMR
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.
First Edition (March 1990)
The following paragraph does not apply to the United Kingdom or any
country where such provisions are inconsistent with local law:
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IBM PS/2 Model 65 SX HMR
Edition Notice
EDITION - 1

FRONT_1 Special 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.
The following terms, denoted by a double asterisk(**) in this publication,
are trademarks of other companies as follows:
80387SX Intel Corporation
IBM PS/2 Model 65 SX HMR
Special Notices
FRONT_1 - 1

CONTENTS Table of Contents
EDITION Edition Notice
FRONT_1 Special Notices
CONTENTS Table of Contents
1.0 Product Description
1.1 Security
1.1.1 Cover Lock
1.1.2 Power-On Password
1.2 System-Board Features
1.2.1 Microprocessor
1.2.2 CMOS RAM
1.2.3 CMOS RAM Extension
1.2.4 ROM BIOS
1.2.5 VGA
1.2.6 Serial Port
1.2.7 Parallel Port
1.2.8 Diskette-Drive Controller
1.2.9 Keyboard Connector and Pointing-Device Connector
2.0 Option Compatibility
2.1 Drive and Diskette Compatibility
2.2 Fixed Disk Drives
2.3 Terminators
3.0 Operating Requirements
3.1 Power Supply
3.2 Power-On Self-Test (POST)
3.3 System Memory
3.3.1 System-Board Memory
3.3.2 Memory-Expansion Adapters
3.3.3 Memory Requirements and Limitations
3.3.4 Memory Errors
4.0 Specifications
5.0 Special Tools
5.1 Volt-Ohm Meter
5.2 Wrap Plug
6.0 Service Position
7.0 Removals and Replacements
7.1 1005 Cover
7.2 1010 Cover Lock
7.3 1015 Adapters
7.4 1020 Math Coprocessor
7.5 1025 Speaker Assembly
7.6 1030 Feet
7.7 1035 Front Bezel
7.8 1040 Carrying Handle
7.9 1045 Power Supply
7.10 1050 Diskette Drive
7.11 1055 Diskette Drive Support Structure
7.12 1060 Fixed Disk Drive (Front Bay)
7.13 1065 Fixed Disk Drive (Rear Bay)
7.14 1070 Fixed Disk Drive Bracket
7.15 1075 Fixed Disk Drive Support Structure
7.16 1080 Memory-Module Kits
7.17 1085 System Board
7.18 1090 Fixed Disk Drive Support Structure Bracket
8.0 Locations
8.1 Front View
8.2 Rear View
8.3 Interior View
8.4 Internal Cables
8.5 System Board
9.0 Safety Grounds
IBM PS/2 Model 65 SX HMR
Table of Contents
CONTENTS - 1

1.0 Product Description
|The IBM (*) Personal System/2 (*) Model 65 SX computers use the IBM Micro
|Channel (*) architecture. The features of the various types of Model 65
|SX are:
|Security: cover lock and power-on password
|System board:
| - 16-MHz 80386SX (**) Microprocessor.
| - 80387SX (**) Math Coprocessor socket.
| - 2MB (MB = 1,048,576 bytes) of random access memory (RAM). The
| total system memory capacity is 16MB.
| - 64 bytes of complementary metal-oxide semiconductor random access
| memory (CMOS RAM).
| - Read-only memory basic input/output system (ROM BIOS).
| - Video graphics array (VGA).
| - Eight expansion slots:
| - One auxiliary-video connector
| - One slot occupied by the SCSI Adapter.
| - Serial port.
| - Parallel port.
| - Diskette-drive controller.
| - Keyboard connector.
| - Pointing-device connector.
| - Display connector.
| - Fixed-disk-drive connector.
|Power supply:
| - Automatically switches to the 100-125 Vac or the 200-240 Vac range
| - 50 or 60 Hz
| - 225 watts.
|Speaker
|101/102-key keyboard
|Fixed disk drives supported (see "Fixed Disk Drives" in topic 2.2).
| (*) IBM, Personal System/2, and Micro Channel are trademarks of
| the International Business Machines Corporation.
| (**) 80386SX and 80387SX are trademarks of the Intel
| Corporation.
Subtopics
1.1 Security
1.2 System-Board Features
IBM PS/2 Model 65 SX HMR
Product Description
1.0 - 1

1.1 Security
Subtopics
1.1.1 Cover Lock
1.1.2 Power-On Password
IBM PS/2 Model 65 SX HMR
Security
1.1 - 1

1.1.1 Cover Lock
The cover lock is on the left side 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 for the model you are servicing). The new assembly contains two
keys. Use one of the new keys, along with a pair of pliers to force the
old cover lock open.
IBM PS/2 Model 65 SX HMR
Cover Lock
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, use the following procedure:
1. Turn off the system unit and all attached options (such as the display
and printer).
2. Unplug all computer power cords from electrical outlets.
3. Remove the system-unit cover.
4. If necessary, temporarily remove any long adapters in expansion slots
1 to 4.
Note: Make a note of which expansion slot you are removing the
adapter from and where any cables are attached to the adapter.
You will need this information later, when you install the
adapters.
5. Locate the speaker connector 1 on the system board.
PICTURE 2
6. Unplug the speaker connector 1, turn it over (180°), and plug it back
in.
7. Reinstall any adapters that were removed.
8. Plug in all computer power cords.
9. Power-on the system.
This deactivates the password.
IBM PS/2 Model 65 SX HMR
Power-On Password
1.1.2 - 1

1.2 System-Board Features
|The major features of the system board are:
|80386SX Microprocessor
|CMOS RAM
|CMOS RAM Extension
|ROM BIOS
|VGA
|Serial port
|Parallel port
|Diskette-drive controller
|Keyboard connector
|Pointing-device connector.
Subtopics
1.2.1 Microprocessor
1.2.2 CMOS RAM
1.2.3 CMOS RAM Extension
1.2.4 ROM BIOS
1.2.5 VGA
1.2.6 Serial Port
1.2.7 Parallel Port
1.2.8 Diskette-Drive Controller
1.2.9 Keyboard Connector and Pointing-Device Connector
IBM PS/2 Model 65 SX HMR
System-Board Features
1.2 - 1

1.2.1 Microprocessor
|The microprocessor interprets and carries out instructions. The 80386SX
|Microprocessor is a 32-bit processor with a 16-bit external data bus and
|operates in two modes: real-address mode and virtual-address (protected)
|mode. The processor speed is 16 MHz.
IBM PS/2 Model 65 SX HMR
Microprocessor
1.2.1 - 1

1.2.2 CMOS RAM
|The CMOS RAM provides 64 bytes of storage. The first 50 bytes are used to
|store system-configuration and security information. The real-time clock
|uses the remaining 14 bytes to track the date, time, and battery level.
|The data stored in the real-time clock module is kept active by a built-in
|battery. If the battery is depleted, replace the real-time clock module.
IBM PS/2 Model 65 SX HMR
CMOS RAM
1.2.2 - 1

|1.2.3 CMOS RAM Extension
|A 2KB (KB = 1024 bytes) CMOS RAM extension stores additional configuration
|and system-status information. The data stored in the CMOS RAM extension
|is kept active by a built-in 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 using one of the following methods:
|If the user has a customized configuration that uses settings other
| than the default, run the restore configuration program on the user's
| backup copy of the Reference Diskette.
|If the configuration uses the default settings, run the automatic
| configuration program on the Reference Diskette.
IBM PS/2 Model 65 SX HMR
CMOS RAM Extension
1.2.3 - 1

1.2.4 ROM BIOS
|ROM BIOS contains the instructions and routines that control the keyboard,
|diskette drives, fixed 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 65 SX HMR
ROM BIOS
1.2.4 - 1

1.2.5 VGA
|The VGA is a graphics controller on the system board. The VGA 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 VGA supports a maximum of 720-by-400 picture elements (PELs) in the
|text mode and 640-by-480 PELs in the graphics mode. The VGA can support
256 colors or 64 shades of gray at one time. Composite video is not
supported.
One expansion slot on the system board extends farther to the rear of the
system board than the others. This extended expansion slot accommodates
|video adapters that are designed to interface with the system-board VGA.
|Some of these adapters have a display connector of their own. The
extended expansion slot also supports all adapters designed to be
installed in the shorter slots.
IBM PS/2 Model 65 SX HMR
VGA
1.2.5 - 1

1.2.6 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 by the system configuration as either
SERIAL 1 or SERIAL 2.
|If adapters with serial ports are installed in the system, they can be
|configured from SERIAL 1 to SERIAL 8. The port on the system board can
|only be SERIAL 1 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 Reference Diskette. Select View configuration to
| verify that no lines are addressed the same.
IBM PS/2 Model 65 SX HMR
Serial Port
1.2.6 - 1

1.2.7 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 an input/output port for any
|device or application that matches the input/output capabilities of the
|port. When adapters with additional parallel ports are installed, the
|system can support three different devices, each addressed separately as
|PARALLEL 1, PARALLEL 2, or PARALLEL 3.
Note: Conflicts occur when two or more devices have the same address.
Select the Set configuration option on the Reference Diskette.
Select View configuration to verify that no lines are addressed the
same.
IBM PS/2 Model 65 SX HMR
Parallel Port
1.2.7 - 1

1.2.8 Diskette-Drive Controller
|The controller connects to the diskette drives 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. These signals and
|voltages can operate two IBM 3.5-inch diskette drives.
IBM PS/2 Model 65 SX HMR
Diskette-Drive Controller
1.2.8 - 1

1.2.9 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 is the same for both. A fuse on the system board protects the
|system board, keyboard, and pointing device.
IBM PS/2 Model 65 SX HMR
Keyboard Connector and Pointing-Device Connector
1.2.9 - 1

2.0 Option Compatibility
The &mod65. uses some adapters designed for Models 50, 60, 70, and 80
computers. For more information, see the parts section in the Hardware
Maintenance Service pamphlet for the model you are servicing.
Subtopics
2.1 Drive and Diskette Compatibility
2.2 Fixed Disk Drives
2.3 Terminators
IBM PS/2 Model 65 SX HMR
Option Compatibility
2.0 - 1

2.1 Drive and Diskette Compatibility
|The following provides information concerning the identification of
|diskette drives.
+----------------------------------------+
¦ Diskette Drive ¦ Identifying Mark ¦
+------------------+---------------------¦
+------------------+---------------------¦
¦ 3.5 Inch - 720KB ¦ None ¦
+------------------+---------------------¦
¦ 3.5 Inch - ¦ 1.44 on the Eject ¦
¦ 1.44MB ¦ Button ¦
+------------------+---------------------¦
¦ ¦ ¦
+----------------------------------------+
|The following addresses the compatibility of diskettes to diskette drives.
+---------------------------------------------+
¦ Diskette ¦ 720KB ¦ 1.44MB ¦
¦ Capacity ¦ Drive ¦ Drive ¦
+------------+------------------+-------------¦
¦ 1.0MB ¦ Read/Write ¦ Read/Write ¦
+------------+------------------+-------------¦
¦ 2.0MB ¦ Not Compatible ¦ Read/Write ¦
+------------+------------------+-------------¦
¦ ¦ ¦ ¦
+---------------------------------------------+
Note: For additional information, see "Diskette Drives and Diskettes" in
the IBM Personal System/2 Hardware Maintenance Reference General
Information pamphlet in this manual.
IBM PS/2 Model 65 SX HMR
Drive and Diskette Compatibility
2.1 - 1