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What are real and protected modes The term real mode refers to older systems and applications or rather, their behavior Real mode indicates an inability to access extended and virtual memory, and real-mode systems do not support multitasking Applications that run in real mode typically run by trying to directly access the hardware Another feature of real mode is that it is possible for an application to take over memory space that is already in use by a utility or driver Real mode is a processor mode that was used in early microprocessors; it had a limit of 1MB of RAM, which is why the division of memory into conventional and upper, as described in 8, is so important Protected-mode systems, such as the Intel 386 and newer chips, support multitasking and access to extended and virtual memory While most real-mode applications are 16-bit, protected-mode applications are usually 32-bit The term protected mode refers to the fact that each application s memory space is protected from use by other applications DOS cannot run in protected mode, even if it is installed on a computer whose processor can run in protected mode Windows 95 and higher can run in protected mode, and Windows 9x retains the ability to run real-mode applications In general, however, Windows 9x legacy files and drivers work in real mode, and native 32-bit Windows 9x files and drivers work in protected mode
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Safe Mode If Windows 9x contains a bad device driver or a corrupt legacy configuration file, the OS might not be able to load at all By booting in Safe mode, you can instruct the OS to skip these files on startup, which might allow Windows 9x to load so that you can troubleshoot the problem For example, suppose the device driver for a NIC is corrupted and preventing the OS from loading When you start the computer in Safe mode, the NIC device driver is skipped altogether that is, the driver is not processed, so the error does not occur When the OS boots in Safe mode, the real-mode configuration phase is skipped That is, legacy configuration files such as AUTOEXECBAT and CONFIGSYS are not processed Furthermore, the only device drivers to be loaded are the standard mouse, keyboard, and VGA display drivers Again, you will not have the full functionality of Windows 9x when you boot in Safe mode, but enough of the OS will load to allow you to troubleshoot the problem Troubleshooting is covered in more detail in 10, including how to use Safe mode to install and remove drivers When the OS boots in Safe mode, the text Safe Mode will appear in each corner of the monitor to indicate this status While in Safe mode, you will be unable to access the Network Neighborhood or any mapped network drives MS-DOS Mode In some ways, MS-DOS mode is the opposite of Safe mode In Safe mode, only the protected-mode configuration files are processed In MS-DOS mode, only the DOS-based real-mode configuration files, such as AUTOEXECBAT and CONFIGSYS, are processed You can run Windows 9x in real mode, either by selecting Command Prompt Only from the Startup menu or by selecting Start | Shutdown | Restart in MS-DOS mode There are several reasons for starting the computer in real (DOS) mode For example, some DOS applications, such as games, will not run properly from within a Windows 9x DOS shell These applications require full control of the hardware, so they cannot be run from Windows You might also need to start the computer in real mode if the Windows 9x OS is too badly corrupted to start in Safe mode The DOS mode might allow you to delete problematic utilities or drivers from the hard drive or to reinstall Windows 9I There are several other Windows 9x boot modes, as listed in Table 9-4
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