CMOS, refers to the Complementary Metal Oxide Semiconductor - a large-scale integrated circuit chip manufacturing applied materials) is a computer on the mainboard writeable only to keep the RAM chips, hardware configuration and the current system of some parameters of the user. By the motherboard CMOS battery power, even if the system power, will not lose information. CMOS RAM itself is a piece of memory, only the data storage function, and the parameters of the CMOS setup in through specific procedures.
In the field of computer, CMOS often refers to the preservation of computer basic startup information (e.g., date, time, startup Settings, etc.) of the chip. Sometimes people will say, mixed with BIOS CMOS on the mainboard is actually a CMOS RAM chips, is the writeable only to preserve the hardware configuration and user BIOS setup of some parameters. By the motherboard CMOS battery power, even if the system power, will not lose information. CMOS RAM itself is a piece of memory, only the data storage function. But for all the parameters in the BIOS setting to pass a special program. BIOS setup procedures are generally manufacturer integrating in chip, in particular the buttons on startup through can enter BIOS setup program, convenient for system Settings. Therefore the BIOS setting is sometimes called the CMOS setup.
Early CMOS chip is a separate MC146818A (DIP encapsulation), were 64 bytes storage system information. 386 later MC146818A chip microcomputer generally will be integrated into other IC chip (such as 82C206, PQFP encapsulation), especially after the mainboard 45/79 with real-time clock will CMOS battery back-up and integrated into a DALLDA called DS1287 chip. Along with the development of computer and the parameters of the CMOS RAM, now have generally 128 bytes when 256 bytes of capacity. To maintain the compatibility, the BIOS manufacturers will own the CMOS RAM about 64 bytes of MC146818A unified content with the CMOS RAM expanded format, but in the part with their special setting, so the BIOS chip that different manufacturer usually are not interchangeable, even can exchange, exchange information and to CMOS reset to ensure the normal operation of system.
CMOS original refers to the complementary metal oxide semiconductor memory, is a large-scale integrated circuit chip manufacturing applied materials) is a computer on the mainboard writeable only the RAM chips, mainly used to save the current system of the hardware configuration and the operator of some parameters Settings. CMOS RAM chips through a backup battery by the system in power, therefore it, or meet system power, CMOS information would be lost.
Due to the CMOS RAM chip itself is only a piece of memory, only has the function, so save data of the parameters set in the CMOS setup through special process. Early in the CMOS setup program resident floppy disk (such as IBM’s PC/AT machine), use very convenient. Now most manufacturers will CMOS setup program do BIOS chip, by pressing the boot in particular key can enter CMOS setup program and very easily, so the system setup the CMOS setup again, often called the BIOS setting.
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