MASM Assembly Language x86 Processor - Random_Screen_Location (Chapter 5, Pr 7)

Question

MASM Assembly Language x86 Processor -

Random_Screen_Location (Chapter 5, Pr 7)

Hello Chegg experts, this is one of my programming assignments for MASM assembly language x86 Processor.

I desperately need your help on this!! Also use Irvine32 library.

Here is the assignment:

DOS_file_time (Chapter 7, Supplied)

Suppose the time field of a file directory entry uses bits 0-4 for 2-second increments, bits 5-10 for minutes, and bits 11-15 for hours (24-hour clock). Write a procedure named ShowFileTime that receives a binary file time value in the AX register and displays the time in hh:mm:ss format. For example, the binary 0001 0010 0000 0111 indicates a time of 02:16:14, in hh:mm:ss format:

For simplicity, we want to input 4-digit hexadecimal and show its binary to verify. For this, you can call ReadHex and WriteBinB. Then you can call your ShowFileTime to display the file time. You may call WriteDec, WriteChar, and consider prefixed zeros. Run your program; the screen will be like this:

Any reusable helper procedure is preferred, such as displaying a leading zero character if the value of hours, minutes, or seconds less than 10, else displaying an original two digits.

-----------------

Thank you in advance...

  00010 010000 00111    

DOS_file_time (Chapter 7, Supplied) upposa the time fiald of a file diractory entry uses bits 0-4 for 2-second incraments, bits 5-10 far minutes, and bits 11-15 for haurs (24-hour clack) Writa a procaclune namad ShowFilaTime that roceivas a binary fle time value in tha AX ragister and displays the time in hh mmss format. For example, the binary 0001 0010 0000 0111 indicates a time of 02:16 14, in hh:mm:ss fonmat 00010 010000 00111 For simplicity, we want ta input 4 digt hexadecimal and show i screen will be like this its binary to verify . For this, you can call ReadHex and WriteBinB. Then you can call your ShaowfileTime to display the file time. You may call WriteDec, WriteChar, and consider prefixed zeros. Run your program; the Please enter 16-bit hexadecinal (1-digit,e.g. 1207) A103 Yo r equivalent binary 1 101D DDD! DDDD 0011 Your DO8 fine tin i 20:08:06 " 20,08:06 0001 0000001112 P16dB"sents r 16-bit hezadBG inal 4-digit, ULU UDUU e.g., 1207): 1207 Any reusable helper proccdure is proferred, such as displaying a leading zera character if the value of haurs, minutes, ar seconds less than 1D, dlse displaying an ariginal twa digit Advanced discussion (not required A possible issue is display of invalid hours, minutes, and seconds. For a real wond app. you do need to check hours 0 to 23, mnutes 0 to 59, and seconds 0 to 59 from the the user input. Since purpoge of this is to practice shift and rotate instructions, you can simply ignore the erar chacking without caring about these 19p top

Explanation / Answer

TITLE DOS File Time              (DOS_File_Time.asm)

INCLUDE Irvine32.inc

.data
prompt1 BYTE "Please enter 16-bit hexadecimal (4-digit, e.g., 1207): ",0
prompt2 BYTE "Your equivalent binary is ",0
prompt3 BYTE "Your DOS file time is ",0
prompt4 BYTE "Sorry, invalid entry...", 0dh, 0ah, 0dh, 0ah, 0

.code
DOS PROC
  
   mov edx,OFFSET prompt1
   call WriteString
   call ReadHex              
   call CheckFormat           ;check format before outputting anything else
   jz Error                   ;ZF=0 if valid
   mov edx,OFFSET prompt2
   call WriteString
   mov ebx,TYPE WORD
   call WriteBinB
   call crlf
   mov edx,OFFSET prompt3
   call WriteString
   call ShowFileTime
   call crlf
   call crlf
   exit
Error:
   mov edx,OFFSET prompt4
   call WriteString
   exit

DOS ENDP

;------------------------------------------------------------
CheckFormat PROC USES eax
;
; Checks to see if a hex number fits DOS file time format
; Receives: EAX hex number to be analyzed
; Returns: sets zero flag if format is incorrect
;------------------------------------------------------------

   mov ecx,eax
   cmp eax,65535
   ja Set
   and ax,001Fh
   cmp ax,29
   ja Set
   mov eax,ecx
   and ax,07D0h
   cmp ax,1888
   ja Set
   mov eax,ecx
   and ax,0F800h
   cmp ax,49152
   ja Set
   ret
Set:
   and ecx,0
   ret

CheckFormat ENDP
;------------------------------------------------------------
ShowFileTime PROC
;
; Displays file time in proper format
; Receives: EAX time to be displayed
; Returns: nothing
;------------------------------------------------------------
  
   mov ecx,eax
   mov edx,eax
   shr ecx,11
   call LeadingZero
  
   mov al,':'
   call WriteChar
   mov ecx,edx
   shr cx,5
   and cx,3Fh
   call LeadingZero
  
   mov al,':'
   call WriteChar
   mov ecx,edx
   and ecx,001Fh
   mov eax,ecx
   mov bx,2
   mul bx
   mov ecx,eax
   call LeadingZero
  
  
   ret
ShowFileTime ENDP
;------------------------------------------------------------
LeadingZero PROC
;
; Check if a number needs a leading zero and write it to the
; screen if it does
; Receives: ECX the number to be checked
; Returns: nothing
;------------------------------------------------------------

   cmp ecx,9
   ja L1
   mov eax,0
   call WriteDec
  
L1:   mov eax,ecx
   call WriteDec
   ret
LeadingZero ENDP
END DOS

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