IBM PC 100 User manual

IBM
Technical Information Manual
PC 100 (Type 6260) and PC 300 (Type 6560)
S78H-5142-00

IBM Technical Information Manual
PC 100 (Type 6260) and PC 300 (Type 6560)
S78H-5142-00

Note
Before using this information and the product it supports, be sure to read the general information under
Appendix B, “Notices and Trademarks” on page 43.
First Edition (August 1996)
The following paragraph does not apply to the United Kingdom or any country where such provisions are inconsistent with
local law: INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION “AS IS” WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimer of express or implied
warranties in certain transactions, therefore, this statement may not apply to you.
This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the information
herein; these changes will be incorporated in new editions of the publication. IBM may make improvements and/or changes in the
product(s) and/or the program(s) described in this publication at any time.
It is possible that this publication may contain reference to, or information about, IBM products (machines and programs),
programming, or services that are not announced in your country. Such references or information must not be construed to mean
that IBM intends to announce such IBM products, programming, or services in your country.
Requests for technical information about IBM products should be made to your IBM reseller or IBM marketing representative.
 Copyright International Business Machines Corporation August 1996. 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.

Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Manual Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Chapter 1. System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Personal Computer Description .......................................... 2
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
System Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
System Address Maps ............................................... 7
Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input/Output Address Map ........................................... 7
DMA I/O Address Map ............................................. 9
IRQ and DMA Channel Assignments ...................................... 10
Interrupt Request Assignments (IRQ) .................................... 10
DMA Channel Assignments .......................................... 10
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Output Parameters ............................................. 11
Component Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Connector Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Advanced Power Management (APM) ...................................... 14
Chapter 2. Connectors and Jumpers ..................................... 15
System Board Connectors ............................................ 16
Diskette Drive Connector ............................................ 16
Hard Disk Drive Connectors (Primary/Secondary) ............................. 17
ISA Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
PCI Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Power Supply Connectors ........................................... 20
System Board Memory Connectors ...................................... 21
Video Feature Connector ............................................ 22
I/O Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Keyboard and Auxiliary-Device (Mouse) Connectors ............................ 23
Serial Port Connectors ............................................. 24
Parallel Port Connector ............................................. 25
Monitor Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Chapter 3. Memory Subsystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Memory-Module Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Memory-Module Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Cache Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Cache Upgrade Options ............................................ 30
Chapter 4. System Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Hardware Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Hardware Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Diskette Drives and Controller ......................................... 33
Hard Disk Drives and Controller ........................................ 34
 Copyright IBM Corp. August 1996 iii

Software Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Software Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Machine-Sensitive Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
BIOS Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Chapter 5. Bus Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Bus Architecture Descriptions ........................................... 37
ISA Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
PCI Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Expansion-Bus Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Bus Voltage Levels ............................................... 39
Appendix A. Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
POST Error Codes ................................................. 40
Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Appendix B. Notices and Trademarks .................................... 43
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
iv Technical Information Manual

Figures
1. System Board Devices, Features, and Options ............................. 4
2. System Board Diagram ........................................... 6
3. System Memory Map ............................................ 7
4. I/O Address Map ............................................... 7
5. DMA I/O Addresses for Memory Addresses, Word Counts, and Command/Status Registers ... 9
6. Interrupt Request Assignments ...................................... 10
7. DMA Channel Assignments ........................................ 10
8. AC Input Power Requirements ....................................... 11
9. Power Output Parameters (145 Watt) ................................... 11
10. Component Maximum Current ....................................... 12
11. Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
12. Advanced Power Management Modes .................................. 14
13. Diskette Drive Connector Signal and Pin Assignments ......................... 16
14. EIDE Connector Signal and Pin Assignments .............................. 17
15. I/O Channel (ISA Bus) Connector ..................................... 18
16. PCI Connector Signal and Pin Assignments ............................... 19
17. Power Supply Connector (Internal Devices) Signal and Pin Assignments .............. 20
18. Power Supply Connector (System Board) Signal and Pin Assignments ............... 20
19. System Board Memory Connector Signal and Pin Assignments ................... 21
20. Video Feature Connector .......................................... 22
21. Keyboard Signal and Pin Assignments .................................. 23
22. Auxiliary-Device (Mouse) Signal and Pin Assignments ......................... 23
23. Serial Port Connector Signal and Pin Assignments ........................... 24
24. Parallel Port Connector Signal and Pin Assignments .......................... 25
25. Monitor Connector Signal and Pin Assignments ............................. 27
26. Memory-Module Type, Speed, and Size – PC 100 ........................... 29
27. Memory-Module Type, Speed, and Size – PC 300 ........................... 29
28. System Memory Table ........................................... 29
29. L1 and L2 Cache .............................................. 30
30. Features of IBM Option Kit 76H0236 ................................... 30
31. 5.25-Inch Diskette Drive Reading, Writing, and Formatting Capabilities ............... 33
32. 3.5-Inch Diskette Drive Reading, Writing, and Formatting Capabilities ................ 33
33. POST Error Messages – PC 100 and PC 300 .............................. 40
34. Beep Codes – PC 100 ........................................... 42
35. Beep Codes – PC 300 ........................................... 42
 Copyright IBM Corp. August 1996 v

Preface
This Technical Information Manual provides information about the IBM PC 100 (Type 6260) and the IBM
PC 300 (Type 6560). It is intended for developers who want to provide hardware and software products to
operate with these IBM computers and provides a more in-depth view of how the computers work. Users
of this publication should have an understanding of computer architecture and programming concepts.
Related Publications
In addition to this manual, the following IBM publications provide information related to the operation of the
PC 100 and PC 300. To order publications in the U.S. and Puerto Rico, call 1-800-879-2755. In other
countries, contact an IBM reseller or an IBM marketing representative.

Using Your Personal Computer – PC 100
1
 Hardware Maintenance Manual – PC 100
1
 Using Your Personal Computer – PC 300
 Installing Options in Your Personal Computer – PC 300
 Understanding Your Personal Computer – PC 300
 Hardware Maintenance Manual – PC 300
Manual Style
Attention: The term reserved describes certain signals, bits, and registers that should not be changed.
Use of reserved areas can cause compatibility problems, loss of data, or permanent damage to the
hardware. When the contents of a register are changed, the state of the reserved bits must be preserved.
When possible, read the register first and change only the bits that must be changed.
In this manual, signals are represented in a small, all-capital-letter format (-ACK). A minus sign in front of
the signal indicates that the signal is active low. No sign in front of the signal indicates that the signal is
active high.
In this manual, use of the letter “h” indicates a hexadecimal number. Also, when numerical modifiers such
as “K”, “M” and “G“ are used, they typically indicate powers of 2, not powers of 10 (unless expressing hard
disk storage capacity). For example, 1 KB equals 1024 bytes (2 10), 1 MB equals 1048576 bytes (2 20),
and 1 GB equals 1073741824 bytes (230).
When expressing storage capacity, MB equals 1000 KB (1024000). The value is determined by counting
the number of sectors and assuming that every two sectors equals 1 KB.
The actual storage capacity available to the user can vary, depending on the operating system and other
system requirements.
1Not available in the U.S. and Puerto Rico.
vi  Copyright IBM Corp. August 1996

Chapter 1. System Description
Chapter 1. System Description
Personal Computer Description .......................................... 2
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
System Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
System Address Maps ............................................... 7
Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input/Output Address Map ........................................... 7
DMA I/O Address Map ............................................. 9
IRQ and DMA Channel Assignments ...................................... 10
Interrupt Request Assignments (IRQ) .................................... 10
DMA Channel Assignments .......................................... 10
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Output Parameters ............................................. 11
Component Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Connector Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Advanced Power Management (APM) ...................................... 14
 Copyright IBM Corp. August 1996 1

Chapter 1. System Description
Personal Computer Description
The IBM PC 100 (Type 6260) and PC 300 (Type 6560) are versatile products designed to provide
state-of-the-art computing power with room for growth in the future. The two computer models are similar
in design, utilizing the same cover, frame assembly, and system board. They differ in the type of BIOS
resident and in the mix of standard features.
The major features of the PC 100 and PC 300 are:
Intel Pentium microprocessor
Up to 128 MB of system memory
Cirrus GD5436 video subsystem
1 MB of video memory with sockets for additional 1 MB
Industry-standard compatibility
ISA/PCI I/O-bus compatibility
ISA/PCI expansion slots
Enhanced EIDE hard disk drive
Bus master-capable EIDE controller
Two 16550-UART serial ports (serial A and serial B)
L2 cache sockets for pluggable SRAMS (256 KB)
Support for advanced power management
EnergyStar compliant
Support for Plug and Play adapters and monitors
Security features
System unit size
– Four expansion slots
– Four drive bays
Note: Several model variations are available for both the PC 100 and the PC 300.
2Technical Information Manual