Updating bios for dummies

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; an acronym for Basic Input/Output System and also known as the System BIOS, ROM BIOS or PC BIOS) is non-volatile firmware used to perform hardware initialization during the booting process (power-on startup), and to provide runtime services for operating systems and programs.

The BIOS firmware comes pre-installed on a personal computer's system board, and it is the first software run when powered on.

In modern computer systems, the BIOS contents are stored on flash memory so it can be rewritten without removing the chip from the motherboard.

This allows easy, end-user updates to the BIOS firmware so new features can be added or bugs can be fixed, but it also creates a possibility for the computer to become infected with BIOS rootkits.

/* C P / M B A S I C I / O S Y S T E M (B I O S) COPYRIGHT (C) GARY A. SYS"; this file is known as the "DOS BIOS" (also known as "DOS I/O System") and contains the lower-level hardware-specific part of the operating system.

KILDALL JUNE, 1975 */ […] /* B A S I C D I S K O P E R A T I N G S Y S T E M (B D O S) COPYRIGHT (C) GARY A. Together with the underlying hardware-specific, but operating system-independent "System BIOS", which resides in ROM, it represents the analogue to the "CP/M BIOS".

The final success came when Glenn talked Gary into just separating the I/O from the rest of it, with Glenn promising to re-write the I/O module for the IMSAI 8080 (which he did).

The BIOS in modern PCs initializes and tests the system hardware components, and loads a boot loader or an operating system from a mass memory device.Imsai was subsequently licensed to distribute CP/M version 1.3 which eventually evolved into an operating system called IMDOS.The BIOS of the original IBM PC XT had no interactive user interface.Error codes or messages were displayed on the screen, or coded series of sounds were generated to signal errors when the power-on self-test (POST) had not proceeded to the point of successfully initializing a video display adapter.Options on the IBM PC and XT were set by switches and jumpers on the main board and on peripheral cards.

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