Delete empty subdirectories

Create a directory.

Rename external file.

Rewrite p to create and open a new file.

Returns the current date of the system.

Returns the date and time of the last write.

Gettime p returns the current system time.

Packtime p converts the system date and time and encapsulates it into a 4-byte plastic format.

Set the current date of the system.

Setftime p writes a new system date and time, overwriting the last system date and time file written by the system.

Set the current system time.

Converts the system date and time to a recording format.

Returns the remaining free space of the specified disk.

Returns the total capacity of the specified disk.

Get/setverity p returns/sets the disk read-write flag in dos state.

Returns the full name of the function name.

Fsearch f looks for files in the directory.

Fsplit f divides file names into directories, file names and extensions.

Finds the first file name that matches the given attribute in the current directory or the specified directory.

Returns the next matching file name.

Getfattr p returns the attributes of the file.

Setfattr p set file properties

Returns the value of an interrupt variable.

Intr p performs a soft interrupt.

Msdos p executes dos system call.

Setintvec p sets interrupt value.

Exec p executes a specific program segment through a specific command line.

Keep p interrupts the execution of the program, but it still resides in memory.

Swapvectors p exchanges all interrupt variable values with the current variable.

Dosexitcode f returns subroutine exit.

Dosversion f displays the dos version.