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MS-DOS: Difference between revisions
→DOS BIOS
Tag: 2017 source edit |
Tag: 2017 source edit |
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=== DOS BIOS === | === DOS BIOS === | ||
The DOS BIOS is the lower layer of MS-DOS, which communicates directly with the system's hardware and contains resident device drivers (as opposed to installable drivers, loaded from <code>CONFIG.SYS</code>). This module used to be supplied by an OEM and customized for a particular machine; this practice eventually died out as | The DOS BIOS (Basic I/O System) is the lower layer of MS-DOS, which communicates directly with the system's hardware and contains resident device drivers (as opposed to installable drivers, loaded from <code>CONFIG.SYS</code>). This module used to be supplied by an OEM and customized for a particular machine; this practice eventually died out as the market settled on close to 100% IBM-compatible machines. | ||
It also includes the DOS initialization module, <code>SYSINIT</code>, which is invoked by the boot sector when booting into MS-DOS. The module initializes the DOS BIOS as well as the DOS kernel, parses the <code>CONFIG.SYS</code> file and then proceeds to launch the shell. | It also includes the DOS initialization module, <code>SYSINIT</code>, which is invoked by the boot sector when booting into MS-DOS. The module initializes the DOS BIOS as well as the DOS kernel, parses the <code>CONFIG.SYS</code> file and then proceeds to launch the shell. | ||