RBIL61 - IBM PS/2

Bibliography {#idx166693}{#idx167105}{#idx167161}

CALL xxxxh:xxxxh - Plug-and-Play BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. v1.0A {#idx160379}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 0Eh - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. PS/2IBM PS/2, any model - DIAGNOSTIC STATUS BYTE {#idx168093}{#idx168101}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 0Fh - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. - RESET CODE (IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. PS/2IBM PS/2, any model "Shutdown Status Byte") {#idx168129}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 10h - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. - FLOPPY DRIVE TYPE {#idx168226}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 11h - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. PS/2IBM PS/2, any model - FIRST FIXED DISK DRIVE TYPE BYTE (00-FFh) {#idx168234}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 12h - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. - HARD DISK DATA {#idx168351}{#idx168360}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 13h - AMIAmerican Megatrends, Inc.(American Megatrends, Inc.) A hardware, software and firmware company founded in 1985. Hi-Flex BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - ADVANCED SETUP OPTIONS {#idx168386}{#idx168393}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 19h - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. - FIRST EXTENDED HARD DISK DRIVE TYPE {#idx168478}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 2Fh - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. - Standard CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. Checksum, Low Byte {#idx168964}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 32h - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. - CENTURY BYTE (BCD(Binary Coded Decimal) A method of data storage where two decimal digits are stored in each byte, one in the upper four bits and the other in the lower four bits. Since only the values 0 through 9 are used in each half of a byte, BCD values can be read as decimal numbers on a hexadecimal display of memory or a file. value for the century - currently 19h) {#idx168989}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 33h - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. - INFORMATION FLAG {#idx169000}{#idx169008}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 35h - AMIAmerican Megatrends, Inc.(American Megatrends, Inc.) A hardware, software and firmware company founded in 1985. - EXTENDED MEMORY >16M (high byte) {#idx169069}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 36h - PHOENIX - Second user defined hard disk (type 48) Cylinders MSB {#idx169083}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 37h - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. PS/2IBM PS/2, any model - DATE CENTURY BYTE {#idx169112}{#idx169124}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 38h - PHOENIX - Second user defined hard disk (type 48) Write Precomp. LSB {#idx169153}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 38h-3Fh - ??? IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. PS/2IBM PS/2, any model - Encrypted Password {#idx169162}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 39h - PHOENIX - Second user defined hard disk (type 48) Write Precomp. MSB {#idx169177}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 3Ah - PHOENIX - Second user defined hard disk (type 48) Parking Zone LSB {#idx169188}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 3Bh - PHOENIX - Second user defined hard disk (type 48) Parking Zone MSB {#idx169199}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 3Ch - PHOENIX - Second user defined hard disk (type 48) Sectors per track {#idx169221}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 3Fh - AMIAmerican Megatrends, Inc.(American Megatrends, Inc.) A hardware, software and firmware company founded in 1985. - Extended CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. Checksum, Low Byte {#idx169290}

CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. 65h - AWARD - POWER MANAGEMENT - IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. activity events #2 {#idx169857}

INT 02 - external hardware - NON-MASKABLE INTERRUPT {callout or callback} {#idx123}{#idx153}{#idx161}

INT 05 - PSPS v2.01 - GET PARAMETERS {undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated.} {#idx504}

INT 0B - IRQ3 - SERIAL COMMUNICATIONS (COM2) {callout or callback} {#idx914}

INT 0D - IRQ5 - FIXED DISK (PCIBM PC,XTIBM PC XT), LPT2 (ATIBM PC AT), reserved (PS/2IBM PS/2, any model) {callout or callback} {#idx1050}

INT 10 - Chips & Technologies Extended BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - RETURN CHIP INFORMATION {#idx5290}

INT 10 - Everex Extended Video BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - RETURN EMULATION STATUS {#idx5832}

INT 10 - SOLLEX SuperVGA - ADAPTER CONTROL - GET ADAPTER {#idx6028}

INT 10 - SOLLEX SuperVGA - DISPLAY OUTPUT CONTROL - GET DISPLAY OUTPUT {#idx6073}

INT 10 - VIDEO - ALTERNATE FUNC SELECT (ATI,Tatung,Taxan) - ENHANCED FEATURES {#idx3110}{#idx3116}

INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PSIBM PS/2, any model) - DISPLAY-SWITCH INTERFACE {#idx3017}

INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PSIBM PS/2, any model, EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors., VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers., MCGAMulti-Color Graphics Array(Multi-Color Graphics Array) The low-end color adapter offered in IBMInternational Busiuness Machines's early PS/2IBM PS/2, any model series machines.) - GET EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors. INFO {#idx2915}

INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PSIBM PS/2, any model, VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) - VIDEO REFRESH CONTROL {#idx3033}

INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.,MCGAMulti-Color Graphics Array(Multi-Color Graphics Array) The low-end color adapter offered in IBMInternational Busiuness Machines's early PS/2IBM PS/2, any model series machines.) - ALTERNATE PRTSC {#idx2955}

INT 10 - VIDEO - FUNCTIONALITY/STATE INFORMATION (PSIBM PS/2, any model,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers./MCGAMulti-Color Graphics Array(Multi-Color Graphics Array) The low-end color adapter offered in IBMInternational Busiuness Machines's early PS/2IBM PS/2, any model series machines.) {#idx3497}

INT 10 - VIDEO - GET DISPLAY COMBINATION CODE (PSIBM PS/2, any model,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers./MCGAMulti-Color Graphics Array(Multi-Color Graphics Array) The low-end color adapter offered in IBMInternational Busiuness Machines's early PS/2IBM PS/2, any model series machines.) {#idx3451}

INT 10 - VIDEO - GRAPH-MODE CHARGEN - SET ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. 8x14 GRAPHICS CHARS (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx2778}

INT 10 - VIDEO - GRAPH-MODE CHARGEN - SET ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. 8x8 DOUBLE-DOT CHARS (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx2796}

INT 10 - VIDEO - GRAPH-MODE CHARGEN - SET USER 8x8 GRAPHICS CHARS (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx2742}

INT 10 - VIDEO - GRAPH-MODE CHARGEN - SET USER GRAPHICS CHARACTERS (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx2758}

INT 10 - VIDEO - SAVE/RESTORE VIDEO STATE (PS50+IBM PS/2 Models 50,60,70,80,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx3591}

INT 10 - VIDEO - SET DISPLAY COMBINATION CODE (PSIBM PS/2, any model,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers./MCGAMulti-Color Graphics Array(Multi-Color Graphics Array) The low-end color adapter offered in IBMInternational Busiuness Machines's early PS/2IBM PS/2, any model series machines.) {#idx3487}

INT 10 - VIDEO - TEXT-MODE CHARGEN - LOAD ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. 8x8 DBL-DOT PATTERNS (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx2633}{#idx2723}

INT 10 - VIDEO - TEXT-MODE CHARGEN - LOAD ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. MONOCHROME PATTERNS (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx2618}{#idx2709}

INT 10 - VIDEO - TEXT-MODE CHARGEN - LOAD USER-SPECIFIED PATTERNS (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx2601}{#idx2679}

INT 10 - VIDEO - TEXT-MODE CHARGEN - SET BLOCK SPECIFIER (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx2644}

INT 10 - VIDEO - TOGGLE INTENSITY/BLINKING BIT (JrIBM PCjr, PSIBM PS/2, any model, TANDY 1000, EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors., VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx2401}

INT 11 - BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - GET EQUIPMENT LIST {#idx7447}{#idx7453}

INT 13 - DISK - GET DISK TYPE (XTIBM PC XT 1986/1/10 or later,XT286IBM PC XT/286,ATIBM PC AT,PSIBM PS/2, any model) {#idx9038}{#idx9071}

INT 13 - DISK - GET DRIVE PARAMETERS (PCIBM PC,XT286IBM PC XT/286,CONVIBM Convertible,PSIBM PS/2, any model,ESDI(Enhanced Small Device Interface) A disk drive interface type which was briefly popular before IDE took over. An ESDI drive can transfer data between the drive and controller at 10, 15, or 20 megabits per second, which is faster than an MFM or RLL controller but slower than what is possible with an IDE or SCSI drive. See also IDE.,SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer. A host adapter connects the SCSI bus to the computer's own bus. See also ESDI, IDE.) {#idx8509}{#idx8582}{#idx8628}

INT 13 - DISK - GET STATUS OF LAST OPERATION {#idx7932}{#idx7964}

INT 13 - DISK - READ SECTOR(S) INTO MEMORY {#idx8091}

INT 13 - DISK - RESET DISK SYSTEM {#idx7904}

INT 13 - DISK - SET MEDIA TYPE FOR FORMAT (ATIBM PC AT model 3x9,XT2IBM PC XT 2,XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx9238}

INT 13 - DISK - WRITE DISK SECTOR(S) {#idx8152}

INT 13 - ESDI(Enhanced Small Device Interface) A disk drive interface type which was briefly popular before IDE took over. An ESDI drive can transfer data between the drive and controller at 10, 15, or 20 megabits per second, which is faster than an MFM or RLL controller but slower than what is possible with an IDE or SCSI drive. See also IDE. FIXED DISK - FORMAT UNIT (PSIBM PS/2, any model) {#idx9357}

INT 13 - FIXED DISK - PARK HEADS ON ESDI(Enhanced Small Device Interface) A disk drive interface type which was briefly popular before IDE took over. An ESDI drive can transfer data between the drive and controller at 10, 15, or 20 megabits per second, which is faster than an MFM or RLL controller but slower than what is possible with an IDE or SCSI drive. See also IDE. DRIVE (XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx9323}

INT 13 - FLOPPY DISK - DETECT DISK CHANGE (XTIBM PC XT 1986/1/10 or later,XT286IBM PC XT/286,ATIBM PC AT,PSIBM PS/2, any model) {#idx9104}

INT 13 - FLOPPY DISK - SET DISK TYPE FOR FORMAT (ATIBM PC AT,PSIBM PS/2, any model) {#idx9164}

INT 13 - HARD DISK - CONTROLLER RAM(Random Access Memory) See also DRAM, SRAM. DIAGNOSTIC (XTIBM PC XT,PSIBM PS/2, any model) {#idx8914}

INT 13 - HARD DISK - DRIVE DIAGNOSTIC (XTIBM PC XT,PSIBM PS/2, any model) {#idx8962}

INT 13 - HARD DISK - INITIALIZE CONTROLLER WITH DRIVE PARAMETERS (ATIBM PC AT,PSIBM PS/2, any model) {#idx8681}

INT 13 - HARD DISK - PSIBM PS/2, any model/1 and newer PS/2IBM PS/2, any model - IDENTIFY DRIVE {#idx10028}{#idx10034}{#idx10056}

INT 13 - HARD DISK - PSIBM PS/2, any model/1 and newer PS/2IBM PS/2, any model - READ MULTIPLE DISK SECTORS {#idx9740}{#idx9746}{#idx9773}{#idx9781}{#idx9786}{#idx9791}

INT 13 - HARD DISK - PSIBM PS/2, any model/1 and newer PS/2IBM PS/2, any model - SET CONTROLLER FEATURES REGISTER {undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated.} {#idx9898}{#idx9904}{#idx9916}{#idx9921}{#idx9926}{#idx9931}{#idx9936}

INT 13 - HARD DISK - PSIBM PS/2, any model/1 and newer PS/2IBM PS/2, any model - SET MULTIPLE MODE {#idx9965}{#idx9971}{#idx9997}{#idx10002}{#idx10007}{#idx10012}

INT 13 - HARD DISK - PSIBM PS/2, any model/1 and newer PS/2IBM PS/2, any model - WRITE MULTIPLE DISK SECTORS {#idx9823}{#idx9829}{#idx9858}{#idx9866}{#idx9871}{#idx9876}

INT 13 - HARD DISK - READ LONG SECTOR(S) (ATIBM PC AT and later) {#idx8732}

INT 13 - HARD DISK - READ SECTOR BUFFER (XTIBM PC XT only) {#idx8843}

INT 13 - HARD DISK - RESET HARD DISKS {#idx8808}{#idx8818}

INT 13 - HARD DISK - WRITE LONG SECTOR(S) (ATIBM PC AT and later) {#idx8773}

INT 13 - HARD DISK - WRITE SECTOR BUFFER (XTIBM PC XT only) {#idx8873}

INT 13 - QUICKCACHE II v4.20 - FLUSH CACHE {partially documented} {#idx9813}

INT 14 - SERIAL - EXTENDED COMMUNICATION PORTIBM PC Portable (uses same BIOS as XT) CONTROL (CONVERTIBLE,PSIBM PS/2, any model) {#idx12117}

INT 14 - SERIAL - EXTENDED INITIALIZE (CONVERTIBLE,PSIBM PS/2, any model) {#idx11872}

INT 14 - X00 FOSSIL(Fido/Opus/Seadog Standard Interface Layer) A standardized API for performing serial I/O, originally used by the Fido and Opus bulletin- board software and Seadog bulletin-board mailer, but now in wider use. - ACTIVATE PORTIBM PC Portable (uses same BIOS as XT) {#idx13306}

INT 14 - X00 FOSSIL(Fido/Opus/Seadog Standard Interface Layer) A standardized API for performing serial I/O, originally used by the Fido and Opus bulletin- board software and Seadog bulletin-board mailer, but now in wider use. - DEACTIVATE PORTIBM PC Portable (uses same BIOS as XT) {#idx13319}

INT 14 - X00 FOSSIL(Fido/Opus/Seadog Standard Interface Layer) A standardized API for performing serial I/O, originally used by the Fido and Opus bulletin- board software and Seadog bulletin-board mailer, but now in wider use. - EXTENDED SERIAL PORTIBM PC Portable (uses same BIOS as XT) STATUS/CONTROL {#idx13379}

INT 15 - AMIAmerican Megatrends, Inc.(American Megatrends, Inc.) A hardware, software and firmware company founded in 1985. PCI BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - SET ??? FLAG {undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated.} {#idx21171}

INT 15 - BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - JOYSTICK SUPPORT (XTIBM PC XT after 1982/11/8,ATIBM PC AT,XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx20713}

INT 15 - BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - SET EVENT WAIT INTERVAL (ATIBM PC AT,PS50+IBM PS/2 Models 50,60,70,80) {#idx20649}

INT 15 - BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - WAIT (ATIBM PC AT,PSIBM PS/2, any model) {#idx20839}

INT 15 - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - SMART ENERGY SYSTEM - GET ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. STARTUP VIDEO REG TABLES {partially documented} {#idx18514}{#idx18524}{#idx18533}

INT 15 - KEYBOARD - KEYBOARD INTERCEPT (ATIBM PC AT model 3x9,XT2IBM PC XT 2,XT286IBM PC XT/286,CONVIBM Convertible,PSIBM PS/2, any model) {callout or callback} {#idx19106}

INT 15 - later PS/2IBM PS/2, any model models - GET POS DATA {undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated.} {#idx22904}

INT 15 - later PSIBM PS/2, any model/2s - ALLOCATE DMAsee Direct Memory Access ARBITRATION LEVEL {#idx23101}

INT 15 - later PSIBM PS/2, any model/2s - DEALLOCATE DMAsee Direct Memory Access ARBITRATION LEVEL {#idx23127}

INT 15 - later PSIBM PS/2, any model/2s - GET NUMBER OF DEVICE DESCRIPTOR TABLE (DDT) ENTRIES {#idx23268}

INT 15 - later PSIBM PS/2, any model/2s - GET PHYSICAL FIXED DISK DRIVE NUMBER (SELECTABLE BOOT) {#idx23370}

INT 15 - later PSIBM PS/2, any model/2s - QUERY BOOT REFERENCE PARTITION {#idx23446}

INT 15 - later PSIBM PS/2, any model/2s - READ BOOT DEVICE ID {#idx23400}

INT 15 - later PSIBM PS/2, any model/2s - READ BOOT DEVICE KEY {#idx23423}

INT 15 - later PSIBM PS/2, any model/2s - RESERVED {#idx23143}{#idx23356}{#idx23363}{#idx23393}

INT 15 - later PSIBM PS/2, any model/2s - RETURN DEVICE DESCRIPTOR TABLE (DDT) ENTRY BY DEVICE ID {#idx23344}

INT 15 - later PSIBM PS/2, any model/2s - RETURN DEVICE DESCRIPTOR TABLE (DDT) ENTRY BY I/O ADDRSS {#idx23320}

INT 15 - later PSIBM PS/2, any model/2s - RETURN DEVICE DESCRIPTOR TABLE (DDT) ENTRY BY NUMBER {#idx23279}

INT 15 - later PSIBM PS/2, any model/2s - RETURN ENTIRE DDT {#idx23334}

INT 15 - later PSIBM PS/2, any model/2s - WRITE BOOT DEVICE ID {#idx23411}

INT 15 - later PSIBM PS/2, any model/2s - WRITE BOOT DEVICE KEY {#idx23434}

INT 15 - newer PS/2IBM PS/2, any model; various BIOSes - GET CPU(Central Processing Unit) The microprocessor which executes programs on your computer. TYPE AND MASK REVISION {#idx22994}{#idx23010}{#idx23016}

INT 15 - OS HOOK - COMPLETION OF SYSREQ FUNCTION (ATIBM PC AT,XT286IBM PC XT/286,PS50+IBM PS/2 Models 50,60,70,80) {#idx18450}

INT 15 - OS HOOK - DEVICE BUSY (ATIBM PC AT,PSIBM PS/2, any model) {#idx21090}{#idx21113}{#idx21127}

INT 15 - OS HOOK - DEVICE OPEN (ATIBM PC AT,XT286IBM PC XT/286,PSIBM PS/2, any model) {callout or callback} {#idx20585}

INT 15 - OS HOOK - DEVICE POSTsee Power-On Self-Test (ATIBM PC AT,PSIBM PS/2, any model) {#idx21141}

INT 15 - OS HOOK - ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. TRACING CALLOUT (PS30IBM PS/2 Model 30 and below/286,PS50Z,PS95) {undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated., callout or callback} {#idx22867}{#idx22893}

INT 15 - OS HOOK - SETUP SYSREQ ROUTINE (ATIBM PC AT,XT286IBM PC XT/286,PS50+IBM PS/2 Models 50,60,70,80) {#idx18431}

INT 15 - OS HOOK - SysReq KEY ACTIVITY (ATIBM PC AT,PSIBM PS/2, any model) {callout or callback} {#idx20813}

INT 15 - PS/2IBM PS/2, any model Model 95 - READ/WRITE CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. MEMORY {undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated.} {#idx23034}

INT 15 - PS/2IBM PS/2, any model Model 95 - RESERVED {undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated.} {#idx23063}{#idx23072}{#idx23094}

INT 15 - SYSTEM - BUILD ABIOS(Advanced BIOS) The IBMInternational Busiuness Machines XTIBM PC XT/286 and PS/2IBM PS/2, any model models with 80286 or higher processors contain two separate BIOSes. The ABIOS is a protected-mode BIOS which is used by OS/2. For machines without an ABIOS, such as the IBMInternational Busiuness Machines ATIBM PC AT, OS/2 loads the equivalent of the ABIOS from disk. see also CBIOS INITIALIZATION TABLE (PSIBM PS/2, any model) {#idx15714}

INT 15 - SYSTEM - BUILD ABIOS(Advanced BIOS) The IBMInternational Busiuness Machines XTIBM PC XT/286 and PS/2IBM PS/2, any model models with 80286 or higher processors contain two separate BIOSes. The ABIOS is a protected-mode BIOS which is used by OS/2. For machines without an ABIOS, such as the IBMInternational Busiuness Machines ATIBM PC AT, OS/2 loads the equivalent of the ABIOS from disk. see also CBIOS SYSTEM PARAMETER TABLE (PSIBM PS/2, any model) {#idx15674}

INT 15 - SYSTEM - COPY EXTENDED MEMORY {#idx20886}{#idx20918}

INT 15 - SYSTEM - ENABLE/DISABLE PROCESSOR FUNCTIONS {#idx22971}

INT 15 - SYSTEM - ENABLE/DISABLE WATCHDOG TIMEOUT (PS50+IBM PS/2 Models 50,60,70,80) {#idx22820}{#idx22827}{#idx22835}

INT 15 - SYSTEM - FORMAT UNIT PERIODIC INTERRUPT (PSIBM PS/2, any model ESDI(Enhanced Small Device Interface) A disk drive interface type which was briefly popular before IDE took over. An ESDI drive can transfer data between the drive and controller at 10, 15, or 20 megabits per second, which is faster than an MFM or RLL controller but slower than what is possible with an IDE or SCSI drive. See also IDE. drives only) {callout or callback} {#idx15993}

INT 15 - SYSTEM - GET CONFIGURATION (XTIBM PC XT >1986/1/10,ATIBM PC AT mdl 3x9,CONVIBM Convertible,XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx21587}{#idx21622}{#idx21650}{#idx21816}{#idx21822}{#idx21828}{#idx21834}{#idx21840}{#idx21846}{#idx21852}{#idx21858}{#idx21864}{#idx21870}{#idx21876}{#idx21882}{#idx21887}{#idx21892}{#idx21900}{#idx21922}{#idx21929}{#idx21935}{#idx21941}{#idx21961}{#idx21967}{#idx21973}{#idx21979}{#idx21985}{#idx21991}{#idx21998}{#idx22008}{#idx22017}{#idx22026}{#idx22032}{#idx22038}{#idx22044}{#idx22050}{#idx22056}{#idx22062}{#idx22068}{#idx22074}{#idx22081}{#idx22087}{#idx22093}{#idx22098}{#idx22103}{#idx22109}{#idx22115}{#idx22121}{#idx22127}{#idx22133}{#idx22139}{#idx22145}{#idx22151}{#idx22157}{#idx22163}{#idx22169}{#idx22175}{#idx22181}{#idx22187}{#idx22193}{#idx22199}{#idx22205}{#idx22211}{#idx22217}{#idx22223}{#idx22229}{#idx22235}{#idx22241}{#idx22247}{#idx22253}{#idx22259}{#idx22265}{#idx22271}{#idx22277}{#idx22283}{#idx22289}{#idx22295}{#idx22301}{#idx22307}{#idx22313}{#idx22318}{#idx22324}{#idx22330}{#idx22336}{#idx22342}{#idx22348}{#idx22354}{#idx22360}{#idx22366}{#idx22372}{#idx22378}{#idx22385}{#idx22392}{#idx22399}{#idx22404}{#idx22409}{#idx22414}{#idx22420}{#idx22426}{#idx22432}{#idx22438}{#idx22444}{#idx22450}{#idx22456}{#idx22462}{#idx22468}{#idx22474}{#idx22480}{#idx22486}{#idx22492}{#idx22498}{#idx22504}{#idx22510}{#idx22516}{#idx22522}{#idx22528}{#idx22534}{#idx22540}{#idx22546}{#idx22552}{#idx22566}

INT 15 - SYSTEM - GET EXTENDED MEMORY SIZE (286+) {#idx20966}

INT 15 - SYSTEM - later PSIBM PS/2, any model/2s - DISABLE A20(Address line 20) The 80286 and higher CPUs allow addresses in real mode to extend slightly beyond the one megabyte mark, which causes an incompatibility with some older programs which expect such addresses to wrap back to the beginning of the address space. For complete compatibility with the 8088, newer machines thus contain circuitry which permits the twenty-first address line (A20) to be disabled. The CPU then effectively has only twenty address lines in real mode, just as the 8088 does, and addresses which would extend beyond the one megabyte mark wrap to the beginning of the address space. See also High Memory Area, Real Mode. GATE {#idx18578}

INT 15 - SYSTEM - later PSIBM PS/2, any model/2s - ENABLE A20(Address line 20) The 80286 and higher CPUs allow addresses in real mode to extend slightly beyond the one megabyte mark, which causes an incompatibility with some older programs which expect such addresses to wrap back to the beginning of the address space. For complete compatibility with the 8088, newer machines thus contain circuitry which permits the twenty-first address line (A20) to be disabled. The CPU then effectively has only twenty address lines in real mode, just as the 8088 does, and addresses which would extend beyond the one megabyte mark wrap to the beginning of the address space. See also High Memory Area, Real Mode. GATE {#idx18606}

INT 15 - SYSTEM - later PSIBM PS/2, any model/2s - EXPANSION UNIT, RETURN CONFIGURATION NUMBER {#idx19167}

INT 15 - SYSTEM - later PSIBM PS/2, any model/2s - GET A20(Address line 20) The 80286 and higher CPUs allow addresses in real mode to extend slightly beyond the one megabyte mark, which causes an incompatibility with some older programs which expect such addresses to wrap back to the beginning of the address space. For complete compatibility with the 8088, newer machines thus contain circuitry which permits the twenty-first address line (A20) to be disabled. The CPU then effectively has only twenty address lines in real mode, just as the 8088 does, and addresses which would extend beyond the one megabyte mark wrap to the beginning of the address space. See also High Memory Area, Real Mode. GATE STATUS {#idx18627}

INT 15 - SYSTEM - later PSIBM PS/2, any model/2s - LOCATE ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. BASIC(Beginner's All-purpose Symbolic Instruction Code) A programming language originally designed as a means of teaching FORTRAN. There are many variations of BASIC with differing capabilities; the majority are interpreted but compiled BASIC is becoming more popular. All genuine IBMInternational Busiuness Machines personal computers (including the latest PS/2IBM PS/2, any model models) come equipped with a cassette-based BASIC interpreter in ROM. {#idx18481}

INT 15 - SYSTEM - later PSIBM PS/2, any model/2s - QUERY A20(Address line 20) The 80286 and higher CPUs allow addresses in real mode to extend slightly beyond the one megabyte mark, which causes an incompatibility with some older programs which expect such addresses to wrap back to the beginning of the address space. For complete compatibility with the 8088, newer machines thus contain circuitry which permits the twenty-first address line (A20) to be disabled. The CPU then effectively has only twenty address lines in real mode, just as the 8088 does, and addresses which would extend beyond the one megabyte mark wrap to the beginning of the address space. See also High Memory Area, Real Mode. GATE SUPPORT {#idx18647}

INT 15 - SYSTEM - later PSIBM PS/2, any model/2s - RETURN MEMORY-MAP INFORMATION {#idx22913}

INT 15 - SYSTEM - POINTING DEVICE BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. INTERFACE (PSIBM PS/2, any model) - ENABLE/DISABLE {#idx22640}

INT 15 - SYSTEM - POWER-ON SELF-TEST ERROR LOG (PS50+IBM PS/2 Models 50,60,70,80) {#idx18461}

INT 15 - SYSTEM - PROGRAMMABLE OPTION SELECT (PS50+IBM PS/2 Models 50,60,70,80) {#idx22852}

INT 15 - SYSTEM - RETURN EXTENDED-BIOS DATA-AREA SEGMENT ADDRESS (PSIBM PS/2, any model) {#idx22627}

INT 15 - V20-XT-BIOS - JOYSTICK SUPPORT {#idx20737}

INT 16 - K3PLUS v6.00+ (API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. v2.0+) - GET VERSION INFORMATION {#idx26627}{#idx26650}

INT 16 - KEYBOARD - CHECK FOR ENHANCED KEYSTROKE (enh kbd support only) {#idx25406}

INT 16 - KEYBOARD - GET ENHANCED KEYSTROKE (enhanced kbd support only) {#idx25388}

INT 16 - KEYBOARD - GET EXTENDED SHIFT STATES (enh kbd support only) {#idx25421}

INT 16 - KEYBOARD - SET TYPEMATIC RATE AND DELAY {#idx25167}{#idx25180}{#idx25190}{#idx25197}

INT 16 - KEYBOARD - STORE KEYSTROKE IN KEYBOARD BUFFER (ATIBM PC AT/PSIBM PS/2, any model w enh keybd only) {#idx25246}

INT 17 - Enhanced Parallel Port (EPP) BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - INSTALLATION CHECK {#idx28733}

INT 18 - DISKLESS BOOT HOOK (START CASSETTE BASIC(Beginner's All-purpose Symbolic Instruction Code) A programming language originally designed as a means of teaching FORTRAN. There are many variations of BASIC with differing capabilities; the majority are interpreted but compiled BASIC is becoming more popular. All genuine IBMInternational Busiuness Machines personal computers (including the latest PS/2IBM PS/2, any model models) come equipped with a cassette-based BASIC interpreter in ROM.) {#idx29895}

INT 19 - SYSTEM - BOOTSTRAP LOADER {#idx30357}

INT 1A - PCI BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. v2.0c+ - READ CONFIGURATION DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. (Intel devices) {#idx35921}

INT 1A - TIME - CANCEL ALARM (ATIBM PC AT,XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx30675}

INT 1A - TIME - GET REAL-TIME CLOCK DATE (ATIBM PC AT,XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx30533}

INT 1A - TIME - GET REAL-TIME CLOCK TIME (ATIBM PC AT,XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx30435}

INT 1A - TIME - READ RTCsee Real-Time Clock ALARM TIME AND STATUS (CONVIBM Convertible,PS30IBM PS/2 Model 30 and below) {#idx30700}

INT 1A - TIME - READ SYSTEM-TIMER DAY COUNTER (XT2IBM PC XT 2,PSIBM PS/2, any model) {#idx30721}

INT 1A - TIME - SET ALARM (ATIBM PC AT,XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx30643}

INT 1A - TIME - SET REAL-TIME CLOCK DATE (ATIBM PC AT,XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx30613}

INT 1A - TIME - SET REAL-TIME CLOCK TIME (ATIBM PC AT,XT286IBM PC XT/286,PSIBM PS/2, any model) {#idx30491}

INT 1A - TIME - SET SYSTEM-TIMER DAY COUNTER (XT2IBM PC XT 2,PSIBM PS/2, any model) {#idx30737}

INT 21 - 10NET v5.0 - GET LOCAL 10NET CONFIGURATION TABLE {#idx53548}

INT 21 - MS-DOS 7.20 (Win98) - EXTENDED-LENGTH FILENAME OPERATIONS {#idx45961}

INT 21 - VIRUS - "PS-MPC.Gold" - INSTALLATION CHECK {#idx52171}

INT 2F - MS Windows - GET DEVICE API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. ENTRY POINT {#idx79846}

INT 2F - MS-DOS 3.3+ KEYB.COM internal - INSTALLATION CHECK {partially documented} {#idx89660}{#idx89671}{#idx89714}{#idx89724}{#idx89730}{#idx89742}

INT 2F - SCRNSAV2.COM - INSTALLATION CHECK {#idx86021}

INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - GET ??? {#idx99153}

INT 33 - MS MOUSE v6.26+ - GET SOFTWARE VERSION, MOUSE TYPE, AND IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. NUMBER {#idx98867}{#idx98874}

INT 41 - SYSTEM DATA - HARD DISK 0 PARAMETER TABLE ADDRESS [NOT A VECTOR!] {#idx99946}

INT 42 - VIDEO - RELOCATED DEFAULT INT 10 VIDEO SERVICES (EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.) {#idx100210}

INT 46 - SYSTEM DATA - HARD DISK 1 DRIVE PARAMETER TABLE ADDRESS [NOT A VECTOR!] {#idx100491}

INT 60 - FTP(File Transfer Protocol) The standard protocol for copying files from one machine to another on a TCP/IP (Internet) network. Also the program of the same name with which a user may transfer files. Packet DriverAny one of the numerous drivers conforming to FTP Software's Packet Driver Specification, which provides a hardware-independent network interface. See also NDIS, ODI. - BASIC(Beginner's All-purpose Symbolic Instruction Code) A programming language originally designed as a means of teaching FORTRAN. There are many variations of BASIC with differing capabilities; the majority are interpreted but compiled BASIC is becoming more popular. All genuine IBMInternational Busiuness Machines personal computers (including the latest PS/2IBM PS/2, any model models) come equipped with a cassette-based BASIC interpreter in ROM. FUNC - GET DRIVER INFO {#idx106719}

INT 67 - RM386 v6.00 - GET RM386 GLOBAL FLAGS {#idx116669}{#idx116686}

INT 74 - IRQ12 - POINTING DEVICE (PSIBM PS/2, any model) {callout or callback} {#idx121798}

INT 76 - IRQ14 - HARD DISK CONTROLLER OPERATION COMPLETE (ATIBM PC AT and later) {callout or callback} {#idx121869}

INT 77 - IRQ15 - RESERVED (ATIBM PC AT,PSIBM PS/2, any model) {callout or callback} {#idx121891}

INT FE - ATIBM PC AT/XT286IBM PC XT/286/PS50+IBM PS/2 Models 50,60,70,80 - destroyed by return from protected mode {#idx132744}

INT FF - ATIBM PC AT/XT286IBM PC XT/286/PS50+IBM PS/2 Models 50,60,70,80 - destroyed by return from protected mode {#idx132806}

MEM 0040h:000Eh - BASE I/O ADDRESS OF FOURTH PARALLEL I/O PORTIBM PC Portable (uses same BIOS as XT) (pre-PS/2) {#idx160817}

MEM 0040h:000Eh - SEGMENT OF EXTENDED BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. DATA SEGMENT (PS/2IBM PS/2, any model, newer BIOSes) {#idx160833}

MEM 0040h:0010h - INSTALLED HARDWARE {#idx160964}{#idx160995}

MEM 0040h:0012h - MCA - MANUFACTURING TEST {#idx161049}{#idx161056}

MEM 0040h:0016h - ATIBM PC AT - MANUFACTURING TEST SCRATCH PAD {undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated.} {#idx161103}

MEM 0040h:0072h - POSTsee Power-On Self-Test RESET FLAG {#idx161602}

MEM 0040h:0074h - FIXED DISK LAST OPERATION STATUS (except ESDI(Enhanced Small Device Interface) A disk drive interface type which was briefly popular before IDE took over. An ESDI drive can transfer data between the drive and controller at 10, 15, or 20 megabits per second, which is faster than an MFM or RLL controller but slower than what is possible with an IDE or SCSI drive. See also IDE. drives) {#idx161643}

MEM 0040h:007Bh - INT 4Bh FLAGS (PS2 and newer) {#idx161797}

MEM 0040h:007Bh - PARALLEL DEVICE 4 TIME-OUT COUNTER (pre-PS, PSIBM PS/2, any model Models 25,30) {#idx161772}{#idx161779}

MEM 0040h:0098h - TIMER2 (ATIBM PC AT, PSIBM PS/2, any model exc Mod 30) - PTR TO USER WAIT-COMPLETE FLAG {#idx162147}

MEM 0040h:009Ch - TIMER2 (ATIBM PC AT, PSIBM PS/2, any model exc Mod 30) - USER WAIT COUNT IN MICROSECONDS {#idx162164}

MEM 0040h:00A0h - TIMER2 (ATIBM PC AT, PSIBM PS/2, any model exc Mod 30) - WAIT ACTIVE FLAG {#idx162192}

MEM 0040h:00A4h - PS/2IBM PS/2, any model Mod 30 - SAVED FIXED DISK INTERRUPT VECTOR {#idx162216}

MEM C800h:1C00h - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. XGA(Extended Graphics Array), XGA(Extended Graphics Array)/A - MEMORY-MAPPED REGISTERS {#idx163815}{#idx163823}

Notes {#idx132903}{#idx167845}{#idx167858}{#idx167884}{#idx168178}

Opcodes List {#idx172514}{#idx172534}{#idx172539}{#idx172553}{#idx172563}{#idx172568}{#idx172582}{#idx172593}{#idx172598}{#idx172612}{#idx174172}{#idx174177}{#idx174191}{#idx175186}{#idx175642}{#idx175656}

PORTIBM PC Portable (uses same BIOS as XT) 0000-001F - DMAsee Direct Memory Access 1 - FIRST DIRECT MEMORY ACCESS CONTROLLER (8237) {#idx132981}

PORTIBM PC Portable (uses same BIOS as XT) 0010-001F - DMAsee Direct Memory Access CONTROLLER (8237) ON PS/2IBM PS/2, any model MODEL 60 & 80 {#idx133022}{#idx133067}

PORTIBM PC Portable (uses same BIOS as XT) 0022-0023 - CHIP SET DATA {#idx134525}

PORTIBM PC Portable (uses same BIOS as XT) 0022-0023 - Intel 82358DT 'Mongoose' EISA(Enhanced Industry-Standard Architecture) A 32-bit superset of the IBMInternational Busiuness Machines ATIBM PC AT's expansion bus (which is now known as the ISA or Industry-Standard Architecture bus). CHIPSET - 82359 DRAM(Dynamic Random Access Memory) RAM memory which essentially consists of a tiny capacitor for each bit of memory. Since capacitors do not hold a charge indefinitely, DRAM must be constantly refreshed to avoid losing its contents. Also, the process of reading the contents of the memory are destructive, meaning extra time must be spent restoring the contents of memory addresses which are accessed, so DRAM is slower than SRAM. See also Refresh, SRAM. CONTROLLER {#idx133836}

PORTIBM PC Portable (uses same BIOS as XT) 0040-005F - PIT - PROGRAMMABLE INTERVAL TIMER (8253, 8254) {#idx138980}{#idx139009}{#idx139039}{#idx139062}

PORTIBM PC Portable (uses same BIOS as XT) 0044-0047 - Microchannel - PROGRAMMABLE INTERVAL TIMER 2 {#idx139100}{#idx139109}

PORTIBM PC Portable (uses same BIOS as XT) 0060-006F - KEYBOARD CONTROLLER 804x (8041, 8042) (or PPI (8255) on PCIBM PC,XTIBM PC XT) {#idx139212}{#idx139362}{#idx139369}{#idx139396}{#idx139612}{#idx139892}{#idx140014}{#idx140029}{#idx140042}

PORTIBM PC Portable (uses same BIOS as XT) 0080 - MANUFACTURING DIAGNOSTICS PORTIBM PC Portable (uses same BIOS as XT) {#idx140642}{#idx140883}

PORTIBM PC Portable (uses same BIOS as XT) 0090-009F - PS/2IBM PS/2, any model - POS (PROGRAMMABLE OPTION SELECT) {#idx141082}{#idx141090}{#idx141097}{#idx141116}{#idx141141}{#idx141156}{#idx141167}{#idx141173}

PORTIBM PC Portable (uses same BIOS as XT) 00C0-00DF - DMAsee Direct Memory Access 2 - SECOND DIRECT MEMORY ACCESS CONTROLLER (8237) {#idx141958}

PORTIBM PC Portable (uses same BIOS as XT) 00E0-00E7 - MICROCHANNEL {#idx142007}

PORTIBM PC Portable (uses same BIOS as XT) 00E0-00EF - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. PSIBM PS/2, any model/1 CLOCK {#idx142062}

PORTIBM PC Portable (uses same BIOS as XT) 0100-0107 - PS/2IBM PS/2, any model POS (Programmable Option Select) {#idx142242}{#idx142256}{#idx142263}

PORTIBM PC Portable (uses same BIOS as XT) 0108-010F - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. PS/2IBM PS/2, any model - 8 digit LED info panel {#idx142360}

PORTIBM PC Portable (uses same BIOS as XT) 0370-0377 - FDC 2 (2nd Floppy Disk Controller) first FDC at 03F0 {#idx146842}{#idx146848}{#idx146858}{#idx146864}

PORTIBM PC Portable (uses same BIOS as XT) 03BC-03BF - PARALLEL PRINTER PORTIBM PC Portable (uses same BIOS as XT) (MDA(Monochrome Display Adapter) A text-only video adapter introduced together with the original IBMInternational Busiuness Machines PCIBM PC. See also CGAColor Graphics Adapter, HGC.'s LPT1) {#idx147922}{#idx147941}

PORTIBM PC Portable (uses same BIOS as XT) 03F8-03FF - Serial port (8250,8250A,8251,16450,16550,16550A,etc.) COM1 {#idx151698}{#idx151706}

PORTIBM PC Portable (uses same BIOS as XT) 0678-067A - Intel 82091AA - ECP-mode PARALLEL PORTIBM PC Portable (uses same BIOS as XT) {#idx152669}

Revision History {#idx169952}{#idx169963}