What Is a DOS Printer?

dos, short for disk operating system, is a type of operating system on personal computers. During the 15 years from 1981 to 1995, the disk operating system held a significant position in the IBM PC compatible machine market. Moreover, if some DOS-based versions of Microsoft Windows, such as Windows 95, Windows 98, and Windows Me, are counted, their commercial life can be counted to at least 2000. In all subsequent versions of Microsoft, the disk operating system is still retained.

Disk operating system is

DOS family includes

all

In DOS, disk drives are named using different letters. The standard practice is to reserve "A" and "B" for the floppy drive. If the system has only one floppy disk drive, DOS allows this floppy disk drive to use both codes at the same time, and then DOS will ask the user to replace the magnetic disk. This allows users to copy files to different floppy disks, or run programs on one floppy disk, and then store the data files on another floppy disk. The earliest hard drives were codenamed "C" and "D". On a hard drive, DOS allows only one active partition to exist. With the increasing number of supported hard disks, the method of naming disk letters has evolved: first assign the disk letter to the active primary partition of each hard drive, and then assign the letter to the logical disk area in the extended partition In the third round, the code is assigned to the inactive primary partition. (The previous question was: They exist, and they contain a file system that DOS can read.) Finally, DOS assigns codenames to optical drives, RAM disks, and other hardware. Generally, the disk letters are assigned in alphabetical order according to the loading order of the driver, but the driver can also ask DOS to assign different letters. Drivers such as network disk drives usually assign the last few letters.

Because DOS applications directly use these disk codes (different from the Unix-like system using the / dev directory), if you add new hardware that needs to allocate disk codes, these applications may cause errors. For example: if there is a logical disk area in the extended partition of the original hard disk, and a new hard disk with a primary partition is added at this time, because the primary partition has a higher allocation priority, the original hard disk logical disk area code Will change. In addition, even if a new hard disk with only extended partitions and logical disk areas is added, the code of the RAM disk and optical disk drive will be affected. This problem persisted until the 9x series of Windows; the NT series has a solution: the disk code is reserved for the existing disk drive unless the user manually changes it.

Disk operating system is a

In the DOS environment, after the computer is turned on, the display is not

TIME command

1 Function: Set or display the system

Ever since DOS came out in 1981, versions have continued

Based on 86-DOS operating system,

DOS overview

The DOS system has indeed been completely replaced, but the DOS command is still a useful supplement to the use of Windows. It is used to solve many problems that cannot be solved by Windows, or is more suitable for DOS commands. Since entering the 21st century, naturally not many people have bothered to learn the memory configuration and driver loading technology of DOS. More people are proud to master the use of one or more DOS applications, such as partitioning, formatting, and disk repair programs , Ghost backup, etc. This shows that DOS is widely used as a tool, not its original operating system.

DOS is no longer limited to the DOS operating system, but is more widely applied to the command prompt in Windows. It should be distinguished that the command prompt in Windows is not DOS, but is basically compatible with DOS applications. The command prompt under Windows can execute 32-bit program commands, while DOS is a 16-bit program command. At the same time, batch files have also become a good small program to assist windows batch operations.

DOS enter

Many computer failures are related to the operating system or hard disk. To repair the computer, it is an inevitable step to enter the DOS mode for hard disk maintenance or reinstall the operating system. You can also enter antivirus under DOS. Take Windows 98 as an example. If you can still access windows, you can choose "Start" "Shut down the system" "Restart the computer and switch to MS-DOS mode". You can also start the computer when the Windows screen appears Continuously press the F8 key, and then select "Command prompt only" in the menu that appears. Or you can use a prepared bootable floppy disk or CD-ROM to enter the computer as a floppy disk or CD boot.

It should be noted that booting and entering DOS mode requires the disk to have the ability to boot (that is, it has three system files, MSdos.SYS, IO.SYS and COMMAND, COM). If you want to boot from the hard disk, as long as the hard disk can boot , U disk, CD-ROM can also boot into.

DOS new hardware support

In response to the needs of current computer applications, dos enthusiasts have developed a driver that supports reading flash disks under dos, so that U disks can replace floppy disks. In addition, there are tools that can read NFTS partitions under dos, and Mouse support programs, universal drivers for various optical drives, etc. The development of these programs has extended the adaptability of DOS.

DOS simulator

Under Linux, DOS and its derivatives can be run using DOSEMU (a set of Linux native virtual machines for running real-mode programs). In addition, there are many emulators for running DOS under various versions of UNIX, and some can even run on non-x86 platforms, such as DOSBox.