INT 21H Service 47H: Getting thecurrent directoryFunction 47H determines the currentdirectory for any drive. Define a spacelarge enough to contain the longestpossible pathname (up to 64 bytes), andloads its name in SI. Identify the drive inDL (0-default, 1-A, 2-B, and so forth).SHAKEBEdik dmov ah, 47hmov d1,0leaint 21hmov bl.actlenCHEESEDÍKIII. Procedures1. Run EDIT.COM from the DOSprompt. Then type the followinglines of codemodel tiny.datapathname d 'C:\UNTITLED',0codeorg 100hbeginmov ah, 39hlea dx.pathnameint 21hretend beginSave the program as EXER26.ASM2. Assemble and run the aboveprogram. What happens? Write yourobservations.3. Modify EXER26.ASM and replaceservice 39H with 3BH. Save theprogram as EXER27.ASM.4. Repeat Step 2 for EXER27.ASM.What does the program do? Writeyour observations.IV. ObservationV. ConclusionVI. Programming ProblemWrite a program that allows a user toinput the directory name and perform thefollowing file operations.•••.Create a subdirectory with thespecified name.Delete a subdirectory with thespecified nameGo to the specified directorRetrieve the current workingdirectory.Hint: Use a parameter list for file input.To convert the input string to an ASCIIstring, use the following lines of code:namenar label bytemaxien d 64FOR LONG NAMESactlen db?dirname, do 20 dup (¹)mov ah, Oahlea daeRAKint 21hmov blactlenmov filename (bx), 0Save as PROB18.ASM, PROB19 ASM,and PROB20, ASM, respectively Experiment 17DirectoriesI. ObjectiveAfter performing this activity, youshould be able to1. Perform operations on directoriesin assembly language.II. IntroductionThis experiment covers a number ofextended DOS services for diskoperations introduced by DOS 2.0 and3.0. Many of these services are muchsimpler than the original DOS servicesare generally recommended.These operations involve the use ofan ASCIIZ string to initially identify adrive, path and filename; a file handle;and special error return codes.Int21H Service 39H: Creating adirectoryFunction 39H creates a subdirectory,just like the DOS command MDFor example,diname, dh 'C:\TASM',0mov ah, 39hlea dx dirnameint 21hA successful operation creates thesubdirectory TASM in drive C. An errorsets the carry flag and returns code 03(path not found or invalid path) or 05(access denied or directory alreadyexists) in register AX.INTIH Service 3AH: Removing adirectoryFunction 3AH deletes a subdirectory.just like the DOS command RD.NOTE: You cannot delete the currentdirectory of a directory that containsfilesdinamos dh 'C:\TASM',0mov ah, 3Ahlea dx.dienameint 21hAn error sets the carry flag andreturns code 03, 05, or 15 (invalid driveor directory does not exists).INT21H Service 3BH: Changing thecurrent directoryFunction 3BH changes the currentdirectory to one that you specify, justlike the DOS command CD.dirname, dh 'C:\WINDOWS', 0mov ah, 47hlea dx, diname.int 21hAn error sets the carry flag andreturns code 03 in AX.

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The following program allows the user to input a directory name and perform certain…

Write a program that allows a user to input the directory name and perform the following file operations. • Create a subdirectory with the specified name. • Delete a subdirectory with the specified name • Go to the specified director . Retrieve the current working directory.