Power-On Password, Selectable Drive-Startup Sequence | IBM 560

If you do not follow this procedure, the results are unpredictable.

Note: Whenever possible, use BIOS as an interface to reset the system microprocessor to the real mode. For more information about resetting the system microprocessor, referIBM toPersonalthe

System/2 and Personal Computer BIOS

Interface.

Power-On Password

RT/CMOS RAM	has	8	bytes reserved		for the power-on password
and the check character. The 8 bytes are initialized to								hex 00. The
microprocessor		can access		these	bytes only during POST. After
POST is completed, if a power-on					password	is installed,	the
password	bytes		are locked	and	cannot be	accessed by	any program.

During power-on password installation, the password (1 to 7 characters) is stored in the security space.

Installing the password is a function of the built-in system program Easy-Setup. The power-on password does not appear on the screen when it is installed, changed, or removed. After the power-on password has been installed, it can be changed or removed only during POST.

The computer also can have a keyboard password. For more

information, see the keyboard and auxiliary device controller section of theIBM Personal System/2 Hardware Interface Technical

Reference.

Selectable Drive-Startup Sequence

Selectable drive-startup (selectable boot) allows you to control									the
startup sequence of the drives				in	your	computer. The	order	in	which
the computer looks for the			drives		for your operating		system	is	the
drive-startup sequence. If you are working with multiple operating
systems, you might want to			change the drive-startup sequence					to
load	the operating	system	from	the	hard	disk without	first	checking
the	diskette drive,	or to	do	a remote		program load	(RPL).

ThinkPad 560/560E System Board 2-29

Image 51

IBM 560E manual Power-On Password, Selectable Drive-Startup Sequence

Contents

06J0536 S76H-7587-01 1997 Any countryWith Local Contents System SmapiIndex NMI Bios Video Modes for the ThinkPad . Computer Preface Viii ThinkPad 560/560E Preface System Overview Acoustical Readings Power Supply Voltages Output Protection Clock Hex DescriptionModel Submodel Byte PS/2 products by type number System Board Devices and FeaturesLists System Board devices and their features. Describes Devices Device controller Device Type560 Controller Subsystem Audio subsystem Shows Address Map System Board I/O Address Map Part 2 of 2. System Board I/O Address Map Specifications To Figure List Specifications For ComputerClock Physical Specifications Acoustical Readings WAd BelsIdle Power Supply VoltagesOutput Voltage V dc Current a Voltage Sequencing Power Supply ConnectorNominal value Power Supply Output Protection Battery Pack AverageProtection 14ThinkPad 560/560E System Overview System Control Port Configuration Miscellaneous System FunctionsRAM Subsystem Mask Register Hex 0070 RT/CMOS Data Register Hex 0071 Microprocessor Cache Memory OperationOn-chip cache Memory Read Operations. onlyIf Address Space Hex C0000-C7FFF is L1 cacheablecode for Current For Dc pin 4 is 0.5 a for both Keyboard/Mouse ConnectorSignals Connector Hardware Interface Technical Reference Scan Codes Key Numbers for the 85-Key Keyboard For displayable characters and symbols that are keyable from Displayable Characters and Symbols Disk Drive Pin Signal Part 1 of 2 -Pin External Connector Pin Assignments External Connector Signal Type Part 2 of 2 -Pin External Connector Pin Assignments Diskette Drive and Controller Format Size720KB Pin Signal Type Diskette Drive Connector Memory ROM SubsystemRAM Subsystem System Board ThinkPad Connector thatMapped Starting Above Hex 100000 boundary 11. Dimm Connector Pin Assignments Bytes RAM active When Power Supply Not Turned ListsRAM Bytes Their Addresses Hex 0071 HexBit Bits Operations BitFunction Bytes HexStatus Register a 0These bits allow the selection of a divider output Status Register Hex 00B This Bit Indicates Whether Binary-coded-decimalBCD Status Register D Hex 00D Status Register C Hex Cmos RAM Configuration Byte Hex 00EStatus Byte Hex Byte Hex 011 This byte defines the type Installed Diskette DriveBits 7-4These bits indicate the diskette drive type Hard Disk Bits 5 HardByte Hex 012 This Byte Hex 014 031 LowBytes Hex 015 and Hex Hex 017 018 Address Register. See NMI Disabled. BeforeMiscellaneous System Functions and Ports RT/CMOS 0061 When read, this bit toggles for each refresh requestWhen Set This Bit Enables Speaker Data When Set This Bit Enables Timer Gate Port a Hex 0092This Bit Reserved Selectable Drive-Startup Sequence Power-On Password Hardware Compatibility 33 Part 1 of 2. Error Codes Error Codes Code Error Video Subsystem Video Modes Audio Subsystem Sound Blaster Subsystems Both LCD and monitor Video SubsystemDisplaying Output LCD Displaying output on the monitor Video ModesThinkPad 560E Displaying output on the LCD or both on the LCD and monitor Format Address Box Pages Alpha Buffer MaxiColors Numeric Start Size Mum Pels 800×600 Buffer Box Start SizePels 800×600 Audio Port Specifications Audio Subsystem Sound Blaster Support FunctionLine III Specification VersionSubsystem System board has two 68-pin Pcmcia Standards and Specifications Pin Assignments Shows Pin Assignments For Pcmcia slotsCurrent +for5V Dc±5% is For each Slot Total Both Slots 10ThinkPad 560/560E Subsystems Get Timer Get PowerMode BL=00h. . . . . . . . A-.27 Set Power Request System Hibernation. . . . . . . . . . . . . A-.52 System Information What is Smapi BIOS?System Configuration Power Management Bios Information Word This area identifies the Bios service level defined belowReal Mode Entry Point 16-bit/32-bit Protected Mode Entry Point Input Field Smapi BiosCalling Convention Parameter Structure Sample in Assembler Language Sample in C Language Assembler Language Calling Convention Pseudo Code Language Return Codes Service Get System IdentificationOutput Field CPU ID Information Control Unit Information Get System Sensor Get Video Information Get Refresh Rate Output Field System Configuration Service Output Field Set Display Device Get Pointing Device Set Pointing Device Input Field Support Get Mode BL=00h 28ThinkPad 560/560E Smapi Bios Get Timer Control 30ThinkPad 560/560E Smapi Bios Set Timer Control Event Bit Definition Condition Set System Event Get System Event Set System Event Condition Get System Event Condition 38ThinkPad 560/560E Smapi Bios Get System Set System Get Standby Timer Set Standby Get Hibernation Set Hibernation Get System Event Condition 46ThinkPad 560/560E Smapi Bios Get System Resume Set System Resume Timer 50ThinkPad 560/560E Smapi Bios Request System 52ThinkPad 560/560E Smapi Bios Data Structure Samples Parameters Byte SMBHDRSIG4 Input Parameter Typedef struct Function Declaration Biosseg Installation Check Find Smapi Head Word Smbhdrroffset Pfsmbheaderreal Bios Call Bit Protected Mode Word GetSystemID Thornwood 10594 IBMDirector Licensing Corporation Columbus Trademarks Following terms, denoted by a double asterisk ** in thisPublication, are Trademarks of other companies as follows Index Configuration Low High Expansion Microprocessor Registers API Smapi IBM