BIOS setup

(redirected from CMOS RAM)
Also found in: Acronyms.

BIOS setup

A program used to edit hardware settings in the BIOS of a PC. On earlier PCs, users had to change a setting when a new drive was added, but auto-detect features were later added. Although some settings are quite arcane and modified only by experienced technicians, users sometimes may need to make a change, such as the boot order of the PC (see first boot sequence).

From CMOS to Flash
The BIOS setup has also been called the "CMOS setup" or "CMOS RAM," because settings were initially held in a battery-backed CMOS memory circuit. Subsequently, BIOS settings were stored in non-volatile flash memory.

Accessed at Startup
The BIOS setup is accessed at startup. Soon after a PC is turned on, a short screen message typically passes by very quickly indicating which key to press (usually Esc, F1, F12 or Del). See BIOS, hard disk configuration, BIOS Upgrades and CMOS.
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EPM-1 has all the essential elements of the core of a computer, including the Intel 430HX chipset with the PIIX PCI/ISA accelerator, SODIMM sockets accommodating up to 256MB of DRAM, 82C42PE keyboard/mouse controller, processor power supply, L2 cache memory, Real Time Clock (RTC), battery backed CMOS RAM and clock synthesizer, and flash-based configurable Phoenix BIOS.
It includes a DRAM controller, and integrates key peripherals, including local bus IDE with master mode, keyboard and mouse control, DMA interrupt control, and real-time clock with 256 bytes of CMOS RAM.
The hyperCache Chipset also integrates key peripherals, including local bus IDE with master mode, keyboard and mouse control, DMA interrupt control, and real-time clock with extra CMOS RAM.