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CMOS
 
Abbreviation of complementary metal oxide semiconductor. Pronounced see-moss, CMOS is a widely used type of semiconductor. CMOS semiconductors use both NMOS (negative polarity) and PMOS (positive polarity) circuits. Since only one of the circuit types is on at any given time, CMOS chips require less power than chips using just one type of transistor. This makes them particularly attractive for use in battery-powered devices, such as portable computers. Personal computers also contain a small amount of battery-powered CMOS memory to hold the date, time, and system setup parameters.

BIOS
Basic Input/Output System. Et grundlæggende række programrutiner der, som regel ligger gemt i pc'ens ROM-hukommelse. BIOS'en indeholder bl.a. programkoden, som startes, når man tænder for pc'en, og som sørger for at indlæse pc'ens operativsystem osv. Programmer kalder ofte funktioner i BIOS for at udføre forskellige opgaver, fx indlæsning af en ny sektor fra harddisken, vise noget på skærmen osv.

BIOS

 
Pronounced "bye-ose," an acronym for basic input/output system. The BIOS is built-in software that determines what a computer can do without accessing programs from a disk. On PCs, the BIOS contains all the code required to control the keyboard, display screen, disk drives, serial communications, and a number of miscellaneous functions.
The BIOS is typically placed in a ROM chip that comes with the computer (it is often called a ROM BIOS). This ensures that the BIOS will always be available and will not be damaged by disk failures. It also makes it possible for a computer to boot itself. Because RAM is faster than ROM, though, many computer manufacturers design systems so that the BIOS is copied from ROM to RAM each time the computer is booted. This is known as shadowing.

Many modern PCs have a flash BIOS, which means that the BIOS has been recorded on a flash memory chip, which can be updated if necessary.

The PC BIOS is fairly standardized, so all PCs are similar at this level (although there are different BIOS versions). Additional DOS functions are usually added through software modules. This means you can upgrade to a newer version of DOS without changing the BIOS.

PC BIOSes that can handle Plug-and-Play (PnP) devices are known as PnP BIOSes, or PnP-aware BIOSes. These BIOSes are always implemented with flash memory rather than ROM.

Firmware
programmer som ligger permanent gemt i ROM eller PROM. Et eksempel på firmware kan være styreprogrammer, som ligger gemt i ROM i en ekstern enhed, som fx et CD-ROM-drev eller en printer. Enhedens firmware kan opdateres ved at udskifte ROM-chippen eller reprogrammere en PROM.

FIRMWARE

 
Software (programs or data) that has been written onto read-only memory (ROM). Firmware is a combination of software and hardware. ROMs, PROMs and EPROMs that have data or programs recorded on them are firmware.

Chipset

 
Software (programs or data) that has been written onto read-only memory (ROM). Firmware is a combination of software and hardware. ROMs, PROMs and EPROMs that have data or programs recorded on them are firmware.

gør som jeg, slå det hele op her

http://www.webopedia.com/

ztyxx:
Det er da vist ved at være lang tid siden (DOS), at BIOS blev brugt til at tilgå hardware.

Hvad bruger du så din BIOS til soreno ??  ;o)

soreno> hvad er det så lige der fortæller det forskellige hardware om bl.a sine indstilliger under opstart ;-)

soreno mener nok, at fra og med 2k snakker OS direkte med hardwaren..

BIOS interrupt kald var meget brugt når man programmerede DOS programmer.
Det bruges, mig bekendt, ikke i Win95 og nyere (når protected-mode er enablet).

Linux har vist på intet tidspunkt brugt BIOS kald.

BIOS er en langsom fætter, derfor bruges den mindst muligt.

win9x bruger faktisk BIOS..

lukketid.... ???