IBM ThinkPad 770 User manual

05L1739
S05L-1739-00

Note
Before using this information and the product it supports, be sure to read the
general information under Appendix C, “Notices” on page C-1.
First Edition (December 1997)
The following paragraph does not apply to the United Kingdom or any country
where such provisions are inconsistent with local law: INTERNATIONAL
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 Copyright International Business Machines Corporation 1997. All rights
reserved.
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Contract with IBM Corp.

Contents
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Section 1. System Overview . . . . . . . . . . . . . . . . . . . 1-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
System Board Devices and Features ............... 1-3
System Board I/O Address Map .................. 1-5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Performance Specifications . . . . . . . . . . . . . . . . . . . 1-7
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . 1-8
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . 1-9
Acoustical Readings . . . . . . . . . . . . . . . . . . . . . . . 1-9
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Output Protection . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Voltage Sequencing . . . . . . . . . . . . . . . . . . . . . . . 1-11
Power Supply Connector .................... 1-11
Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Section 2. System Board . . . . . . . . . . . . . . . . . . . . . 2-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Cache Memory Operation .................... 2-2
Cacheable Address Space .................... 2-3
Bus Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Keyboard/Mouse Connector . . . . . . . . . . . . . . . . . . . . . 2-4
Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Scan Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Keyboard ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Displayable Characters and Symbols .............. 2-7
Hard Disk Drive Connector ..................... 2-8
External Bus Connector ....................... 2-9
UltraBay II Connector ....................... 2-12
Diskette Drive and Controller ................... 2-15
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
ROM Subsystem . . . . . . . . . . . . . . . . . . . . . . . . 2-16
RAM Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
System Memory Map ...................... 2-17
System Board Memory for the DIMM Connectors ..... 2-18
 Copyright IBM Corp. 1997 iii

RT/CMOS RAM . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Miscellaneous System Functions and Ports .......... 2-29
Nonmaskable Interrupt (NMI) ................. 2-29
System Control Port A (Hex 0092) .............. 2-30
System Control Port B (Hex 0061) .............. 2-31
Power-On Password . . . . . . . . . . . . . . . . . . . . . . 2-32
Other Passwords . . . . . . . . . . . . . . . . . . . . . . . . 2-32
Selectable Drive-Startup Sequence .............. 2-33
Hardware Compatibility . . . . . . . . . . . . . . . . . . . . . . 2-34
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
Section 3. Subsystems . . . . . . . . . . . . . . . . . . . . . . 3-1
Video Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Video Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Modem Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
ThinkPad Modem . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
MIDI Port Function ........................ 3-5
Sound Blaster Support Function ................ 3-5
Telephony (Modem) Function .................. 3-6
Audio Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
MIDI Port Function ........................ 3-7
Sound Blaster Support Function ................ 3-7
Audio Port Specifications ..................... 3-8
Infrared (IR) Subsystem ....................... 3-9
IRQ Level and DMA Channel .................. 3-9
Enhanced Video Subsystem ................... 3-10
Video Port Specification .................... 3-10
PCMCIA Subsystem . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
IDE Channel on the UltraBay II .................. 3-14
MIDI/Joystick Port . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
MIDI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Joystick Interface . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Appendix A. System Resources . . . . . . . . . . . . . . . . A-1
Appendix B. System Management API (SMAPI) BIOS
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Header Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Calling Convention . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
Parameter Structure . . . . . . . . . . . . . . . . . . . . . . . B-6
Calling Convention Pseudo Code ............... B-10
Return Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-11
Function Description . . . . . . . . . . . . . . . . . . . . . . . . B-12
iv

System Information Service .................. B-12
System Configuration Service ................. B-22
Power Management Service .................. B-29
Event Bit Definition ....................... B-34
Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-53
Function Declaration . . . . . . . . . . . . . . . . . . . . . . B-57
Installation Check . . . . . . . . . . . . . . . . . . . . . . . . B-58
BIOS Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-62
Appendix C. Notices . . . . . . . . . . . . . . . . . . . . . . . . C-1
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-1
v

vi

Figures
1-1. Model and Submodel Bytes ............... 1-2
1-2. System Board Devices and Features .......... 1-3
1-3. System Board I/O Address Map ............. 1-5
1-4. Performance Specifications . . . . . . . . . . . . . . . . 1-7
1-5. Physical Specifications . . . . . . . . . . . . . . . . . . 1-8
1-6. Electrical Specifications . . . . . . . . . . . . . . . . . . 1-9
1-7. Acoustical Readings . . . . . . . . . . . . . . . . . . . . 1-9
1-8. Power Supply Maximum Current ........... 1-10
1-9. Voltage Pin Assignments for the 56W AC Adapter . 1-11
1-10. Lithium-ion Battery Pack Specifications ........ 1-12
2-1. Keyboard and Mouse Signals .............. 2-4
2-2. Keyboard/Mouse Connector Pin Assignments ..... 2-4
2-3. Key Numbers for the 84-Key Keyboard ......... 2-5
2-4. Key Numbers for the 85-Key Keyboard ......... 2-6
2-5. Key Numbers for the External Numeric Keypad .... 2-7
2-6. Hard Disk Drive Connector Pin Assignments ..... 2-8
2-7. 240-Pin External Bus Connector Pin Assignments . 2-11
2-8. UltraBay II Connector Pin Assignments ........ 2-13
2-9. Diskette Drive Read, Write, and Format Capabilities 2-15
2-10. System Memory Map .................. 2-17
2-11. DIMM Adapter Card Memory Connector Pin
Assignments . . . . . . . . . . . . . . . . . . . . . . . 2-18
2-12. RT/CMOS RAM Address Map ............. 2-19
2-13. RT/CMOS Address and NMI Mask Register (Hex
0070) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
2-14. RT/CMOS Data Register (Hex 0071) ......... 2-20
2-15. Real-Time Clock Bytes (Hex 000–00D) ........ 2-22
2-16. Status Register A (Hex 00A) .............. 2-22
2-17. Status Register B (Hex 00B) .............. 2-23
2-18. Status Register C (Hex 00C) .............. 2-24
2-19. Status Register D (Hex 00D) .............. 2-24
2-20. Diagnostic Status Byte (Hex 00E) ........... 2-25
2-21. Diskette Drive Type Byte (Hex 010) .......... 2-26
2-22. Diskette Drive Type Bits 7–4 .............. 2-26
2-23. Hard Disk Type Byte (Hex 011) ............ 2-26
2-24. Hard Disk Drive Type 2 (Bits 7–4) ........... 2-26
2-25. Hard Disk Drive Type 3 (Bits 3–0) ........... 2-26
2-26. Hard Disk Drive Type Byte ............... 2-27
2-27. Equipment Byte . . . . . . . . . . . . . . . . . . . . . 2-27
2-28. Installed Diskette Drive Bits .............. 2-27
2-29. Display Operating Mode Bits .............. 2-27
 Copyright IBM Corp. 1997 vii

2-30. System Control Port A (Hex 0092) .......... 2-30
2-31. System Control Port B (Hex 0061, Write) ...... 2-31
2-32. System Control Port B (Hex 0061, Read) ...... 2-31
2-33. Error Codes . . . . . . . . . . . . . . . . . . . . . . . . 2-35
3-1. BIOS Video VGA Modes ................. 3-3
3-2. Video BIOS Extended Modes—Trident 9397 ...... 3-4
3-3. PCMCIA PC Card Slot Pin Assignments ....... 3-12
viii

Preface
This technical reference contains hardware and software interface
information specific to the IBM ThinkPad 770 computer. This
technical reference is intended for those who develop hardware and
software products for the computer. Users should understand
computer architecture and programming concepts.
This publication consists of the following sections and appendixes:
Section 1, “System Overview,” describes the system, features,
and specifications.
Section 2, “System Board,” describes the system-specific
hardware implementations.
Section 3, “Subsystems,” describes the hardware functions
specific to the ThinkPad 770 computer.
Appendix A, “System Resources,” describes the available
system resources for the computer and docking stations.
Appendix B, “System Management API (SMAPI) BIOS
Overview,” describes the system software interface built into the
system, called the System Management Application Program
Interface (SMAPI) BIOS, which controls the system information,
system configuration, and power management features of the
ThinkPad computer.
Appendix C, “Notices,” contains special notices and trademark
information.
An index is also included.
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. Read the register first and
change only the bits that must be changed.
 Copyright IBM Corp. 1997 ix

x Preface