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Option ROM

An option ROM for the PC platform (i.e. the IBM PC and derived successor computer systems) is a piece of firmware that resides in ROM on an expansion card (or sometimes stored along with the main system BIOS), which gets executed to initialize the expansion device and (optionally) add support for the expansion device to the BIOS. In its usual use, it is…

BIOS Boot Specification, Overview & Original usage of Option ROMs for booting through expansion cards

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BIOS Boot Specification

CompaqIntelPhoenix TechnologiesASCIIPCI configuration space
22 related topics

Overview

PC platformIBM PCFirmwareROMExpansion card
19 related topics

Original usage of Option ROMs for booting through expansion cards

Disk controllerAdaptecInterrupt service routine
3 related topics

UEFI Option ROMs

Unified Extensible Firmware InterfaceLegacy x86
2 related topics

Topics to explore

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Overview

Original usage of Option ROMs for booting through expansion cards

BIOS Boot Specification

UEFI Option ROMs

Advanced semantic analysis

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Map overview Semantic statistics

Option ROM

Nodes51
Edges50
Triples133
Avg. degree1.96
Density0.039216
Components1

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Option ROM

Top relations

related to BIOS Boot Specification · 34
Option ROM → After, ASCII, BBS, BCV, BCV Table, BEV, BIOS, BIOSes, Boot Connection Vector, Compaq, If, INT, Intel, IPL, It, MMIO, NVRAM, Option ROMs, PCI, Phoenix Technologies
related to Video · 31
Option ROM → BIOS, GOP, IBM CGA, IBM EGA, IBM PC AT, IBM PC BIOS, IBM PC XT, IBM-supplied MDA, INT, Legacy BIOS, MCGA, MDA, MDA-compatible, Most, Once, PC, PC AT, PS/2, ROM, ROMs
related to SCSI · 18
Option ROM → Appendix, BAID, BCV, Before, BIOS, BIOS Aware IPL Device, Boot BIOS Specification, Hard Disk Number, In, INT, IPL, It, Once, PnP, ROM, SCSI, SCSI BIOS, This
related to UEFI Option ROMs · 18
Option ROM → BIOS, Compatibility Support Module, CSM, Driver Execution Environment, DXE, If, Legacy, Multiple Option ROM, Option ROMs, This, UEFI, UEFI Compatible, UEFI Option ROM, UEFI Option ROMs, UEFI Setup, Unified Extensible Firmware Interface, When, When Secure Boot
related to Original usage of Option ROMs for booting through expansion cards · 16
Option ROM → Adaptec, As, BIOS, BIOS's, INT, ISR, NIC, Play BIOS, Plug, Prior, ROM, ROMs, SCSI, Some, Such, The
related to Network boot ROM · 12
Option ROM → Another, BEV, BIOS, By, Cassette BASIC, IBM Personal Computer ROMs, INT, NIC, Originally, ROM, The, The BBS
is a · 3
Option ROM → last one to be initialized and so the last one to hook any interrupts and the first one in those interrupt service routine, network boot ROM, video BIOS which gets loaded very early on in the boot process and hooks INT 10h so that output from the power-on self-test

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Important terminology

bios option rom boot roms int device system card expansion video uefi firmware 13h initialization scsi hook bcv call support

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Option ROMis avideo BIOS which gets loaded very early on in the boot process and hooks INT 10h so that output from the power-on self-test0.90text
Option ROMis alast one to be initialized and so the last one to hook any interrupts and the first one in those interrupt service routine0.90text
Option ROMis anetwork boot ROM0.90text
a hard disk controller or a network adapter cardinstance ofan add-on device0.80text
Option ROMrelated to BIOS Boot SpecificationThe BIOS Boot Specification0.60section
Option ROMrelated to BIOS Boot SpecificationBBS0.60section
Option ROMrelated to BIOS Boot SpecificationCompaq0.60section
Option ROMrelated to BIOS Boot SpecificationIntel0.60section
Option ROMrelated to BIOS Boot SpecificationPhoenix Technologies0.60section
Option ROMrelated to BIOS Boot SpecificationPlug0.60section
Option ROMrelated to BIOS Boot SpecificationPlay0.60section
Option ROMrelated to BIOS Boot SpecificationPnP0.60section

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