BIOS is also called the ROM BIOS for the original BIOS chip is stored in read-only memory (ROM) in the motherboard. Why is stored in ROM, is that the BIOS can be executed at the time the computer is turned on, without waiting for the lighting device penyipanan media first (which takes a long time). BIOS in modern PC is stored in ROM chips that can be electrically re-writeable or Flash ROM. That's why, now called Flash BIOS is more popular than the ROM BIOS. Here are some chip ROM BIOS used as storage.
Although BIOS is stored in read-only memory, the configuration is not stored in the ROM BIOS, (this is caused by the static nature of the ROM) but is a separate chip called the Real-time clock (RTC), which form a Non-Volatile Random Access Memory ( NVRAM). NVRAM also often referred to as Complimentary Metal-Oxide Random Access Memory (CMOS RAM), because it uses CMOS manufacturing methods. Because using the method of manufacture of CMOS, NVRAM requires very little power to operate. Although called non-volatile, NVRAM really is a chip that's volatile, so the data stored in it can be easily erased if power is interrupted menghidupinya. Therefore, the NVRAM "alive" by a battery (similar to a calculator or clock battery) with a material with a Lithium CR-2032 series. A Lithium battery CR-2032 can support NVRAM for three to five years. If the power in the battery is discharged, or the power supplied is lost (due to withdrawn from the slot), then all configurations will be returned to standard conditions, according to when the BIOS is programmed by the manufacturer. BIOS generally give reports or NVRAM CMOS Checksum Error Checksum Error.
Source :http://id.wikipedia.org/wiki/BIOS#ROM_dan_NVRAM
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