Io. What file is SYS?

Io. SYS is an important startup file in Win9x mode, which mainly controls the important conversion from machine to operator in start-up, and is the hub of Win9x system startup.

Io. SYS is located under C:, and Msdos.sys COMMAND. COM together form the core of Win9x, typically system, read-only, hidden properties.

Among them, the Msdos.sys plays a role in Io.sys configuration.

Io. SYS is the input and output driver file

Such documents, you had better not delete, some files are system protection files, you want to delete all deleted

1, IO. SYS's internal boot menu

Win 9X Io.sys by the original DOS system files Io.sys, MSDOS. SYS merged to provide the standard hardware input/output interface and DOS interrupt calls, full-featured enhancements, it basically controls the win 9X all START process, is the Windows DOS Real mode of the core file. But it needs to be based on the Msdos.sys settings to achieve the normal boot process.

Io. SYS can change the startup process by the Startup function key, which corresponds to the Startup menu options: Function key

The corresponding Startup menu item F4:

Previous MS-DOS version F5:

Safe mode Shift+f5:command prompt Only F6:

Safe mode with network support F8:

Start up the boot menu Shift+f8:step-by-step confirmation system boot appears "starting Windows 95 ..." When you press the function key, you can

Io. The biggest difference to Dos at startup is that it provides a default Config.sys configuration that meets most DOS applications, and can automatically load the necessary drivers

2, IO. The startup process under SYS control

⑴ when the system starts, IO. SYS displays "Starting Windows 95 ...", at which point you can select the startup mode by the Startup function key.

⑵io.sys determines the boot mode based on the Startup menu selection and Msdos.sys configuration.

⑶ If you use the original DOS system, IO. SYS automatically swap the system boot files for DOS and win 9X, and then start the process by the original DOS control system. (that is, the win 9X dual-boot process is ultimately done by Io.sys control, independent of the boot record, etc.)

⑷io.sys according to the startup mode, the system hardware configuration is Config.sys, if the required files (such as HIMEM) of the win 9X boot are not loaded in Config.sys. SYS, Ifshlp. EXE, etc.), the system is automatically loaded according to the default settings. (If you want to load drivers that use extended memory, such as EMM386.EXE, you must do so in CONFIG.) SYS first line plus Himem.sys driver, otherwise programs will not run because the system does not provide extended memory at this time EMM386.EXE

⑸ complete the hardware configuration such as Config.sys, io.sys the software configuration through Command.com call Autoexec.bat.

The BOOTLOG.TXT of the ⑹ system root is done by Io.sys control, and some other log files are created when the system is installed.

⑺ completes the DOS boot process automatically calls the Win.com, starts the GUI.

is a system important file, recommended backup, if the virus is deleted, you can restore the backup file in Safe mode