China DOS Union

### Additional Functions in MS-DOS 7.x

As we all know, MS-DOS 7.x is the latest and most practical version of MS-DOS. Since its version number is 7, what new functions does it have compared with the old MS-DOS 6.xx? The differences between them are relatively large, and MS-DOS 7.x does have significant updates and progress. Let's make a brief comparison.

#### New Commands:

LOCK UNLOCK LFNFOR EXTRACT XMSMMGR ACCDATE

LOCK and UNLOCK are used to lock/unlock direct disk access.

LFNFOR is used to set whether to use long filenames in the FOR command.

EXTRACT is used to extract compressed files from CAB files.

XMSMMGR is an XMS manager that can be loaded directly on the command line without HIMEM.SYS.

ACCDATE is a CONFIG.SYS command to determine whether to record file access times.

There are also some other newly added undocumented commands, such as the LOGO command in CONFIG.SYS, etc.

#### New Options:

There are many new options, many of which are undocumented, such as COMMAND /T, DIR /Z, etc., which can be specifically seen in the "DOS Usage" column.

Public ones like DIR /4 to display four-digit year (in MS-DOS 7.10), DOS=AUTO, etc.

#### New Functions:

This is a very important part because some functions are indeed very practical.

MS-DOS 7.10 fully supports large memory larger than 64M, thus no longer having the memory limitations of MS-DOS 6.x;

The COMMAND.COM command processor can automatically load into UMB memory without occupying conventional memory;

Commands in CONFIG.SYS such as FILES, BUFFERS, etc., automatically load into UMB memory to greatly save conventional memory;

When executing COMMAND /C command, you can use the Enter and ESC keys to select Yes or No;

Environment variables can be used on the command line, such as directly executing PATH=%PATH%;C:\TEST,

This is the reason why DIR ABC.%A% (temporary file of WPS) displays all files named ABC;

The REN command can change the name of a folder just like changing a file name;

The MORE command can directly display the content of a file in pages;

Support longer pathnames (not referring to the long filename function);

Support using quotes when entering file and folder names, which is especially important for long filenames with spaces, for example: MD "MyFile";

You can use COMMAND /Z command to display the ERRORLEVEL code;

The EDIT command can modify multiple files as well as binary files;

The DIR /V command can display file access times, and the DIR /4 command can display four-digit year, such as 1999;

The DIR command can display the remaining space on the disk even when there are no files present;

Fully support long filenames to greatly facilitate use and improve compatibility;

MS-DOS 7.10 version fully supports FAT32 partitions/large hard disks (LBA partitions, etc.);

... and .... can represent higher parent folders.

And various other functions in undocumented options, etc.

Hehe. The article that has been sealed for a long time.