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| A startup text file once used by DOS and used by Windows to provide backward compatibility. It executes commands automatically during the boot process and is used to create a16-bit environment. |
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| A text file containing a series of OS commands. Autoexec.bat is a batch file. |
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| For DOS and Windows, a floppy disk that can upload the OS files necessary for computer startup. For DOS or Windows 9x/Me, it must contain the files Io.sys, Msdos.sys, and Command.com. |
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| CD (change directory) command |
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Definition
| A command given at the command prompt that changes the default directory, for example CD \Windows. |
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| DOS and Windows 9x/Me memory addresses between 0 and 640 K. Also called base memory. |
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| emergency startup disk (ESD) |
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| Another term for a rescue disk. |
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Definition
| A DOS and Windows 9x/Me utility that provides access to upper memory for 16-bit device drivers and other software. |
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| Memory above 1024 K used in a DOS or Windows 9x/Me system. |
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| A file that has been written to different portions of the disk so that it is not in contiguous clusters. |
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| A file that is not displayed in a directory list. Whether to hide or display a file is one of the file’s attributes kept by the OS. |
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| In DOS or Windows 9x/Me, the first 64K of extended memory. |
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| The DOS and Windows 9x/Me memory manager extension that allowed access to memory addresses above 1 MB. |
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Definition
| Commands that are embedded in the Command.com file. |
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| An area of memory that is treated as though it were a hard drive, but works much faster than a hard drive. The Windows 9x/Me startup disk uses a RAM drive. Compare to virtual memory. |
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Term
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Definition
| A floppy disk that can be used to start up a computer when the hard drive fails to boot. Also called emergency startup disk (ESD) or startup disk. |
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Definition
| Another term for a rescue disk. |
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Term
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| Windows terminology for a bootable disk. |
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Term
| terminate-and-stay-resident (TSR) |
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Definition
| A program that is loaded into memory and remains dormant until called on, such as a screen saver or a memory resident antivirus program. |
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Term
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Definition
| In DOS and Windows 9x/Me, the memory addresses from 640 K up to 1024 K, originally reserved for BIOS, device drivers, and TSRs. |
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Term
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Definition
| In DOS and Windows 9x/Me, a group of consecutive memory addresses in RAM from 640 K to 1MB that can be used by 16-bit device drivers and TSRs. |
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Term
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Definition
| An * or ? character used in a command line that represents a character or group of characters in a filename or extension. |
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