Program for encoding ASCII alpha numeric, Computer Engineering

Assignment Help:

Q. Program for encoding ASCII Alpha numeric?

; A program for encoding ASCII Alpha numeric.

; ALGORITHM:

            ; create the code table

            ; read an input string character by character

            ; translate it using code table 

            ; output the strings 

 DATA   SEGMENT

CODETABLE DB 48 DUP (0); no translation of first 

                                                ; 48 ASCII

                                    DB '4590821367'; ASCII codes 48 - 

                                                ; 57 ≡ (30h - 39h)

                                        DB 7 DUP (0); no translation of          these 7 characters

                                        DB    'GVHZUSOBMIKPJCADLFTYEQNWXR'

                                        DB 6 DUP (0); no translation

                                        DB  'gvhzusobmikpjcadlftyeqnwxr'

                                        DB 133 DUP (0); no translation of remaining 

                                                 ; Character

DATA ENDS

 

CODE SEGMENT

            MOV AX, DATA

            MOV DS, AX   ; initialize DS

            MOV BX, OFFSET CODETABLE; point to lookup table

GETCHAR:     

            MOV AH, 06; console input no wait

            MOV DL, 0FFh   ; specify input request

            INT 21h; call DOS

            JZ QUIT   ; quit if no input is waiting

            MOV DL, AL   ; save character in DL

            XLAT CODETABLE; translate the character

            CMP AL, 0; translatable?

            JE PUTCHAR   ; no: write it as is.

            MOV DL, AL; yes: move new character

                                    ; To DL

PUTCHAR:     

   MOV AH, 02   ; write DL to output 

   INT 21h  

   JMP   GETCHAR; get another character

QUIT:             MOV AX, 4C00h  

   INT 21h  

CODE ENDS    

END

Discussion: 

The program above will code the data. For illustration a line from an input file will be encoded:

A SECRET Message                          (Read from an input file)

G TUHFUY Juttgou                           (Encoded output)

The program above can be run by using following command line. If program file name is coding.asm

Coding infile > outfile 

The infile is input data file and outfile is output data file.

You can write more such applications by using 8086 assembly tables.


Related Discussions:- Program for encoding ASCII alpha numeric

Show select tag and pull down lists, The next type of input is a Pull Down ...

The next type of input is a Pull Down List. With this type you have to employ in place of and it also has a closing tag. This control is used when we have a

What is the difference among thread and process, Thread is a least unit of ...

Thread is a least unit of process. In process have one or more thread.

Sem 4, Which are the subject of sem 4?

Which are the subject of sem 4?

Chains of inference, Chains of Inference: Now we have to look at how t...

Chains of Inference: Now we have to look at how to get an agent to prove a given theorem using various search strategies? Thus we have noted in previous lectures that, there i

Explain about distributed shared memory systems, Explain about Distributed ...

Explain about Distributed Shared Memory Systems? Distributed Shared Memory (DSM) systems emulate a shared memory abstraction on loosely coupled architectures in order to allow

Recursive binary search, The implementation of a (non-recursive) binary sea...

The implementation of a (non-recursive) binary search of an array. The assumption is that a given array is sorted. We want to see if a particular value, that we'll call the target

Same reg variable in an always block, What value is inferred when multiple ...

What value is inferred when multiple procedural assignments made to the same reg variable in an always block? When  there  are  multiple  nonblocking  assignments  made  to  th

Implement a memory management system , There should be 1 server thread and ...

There should be 1 server thread and N client threads, where N is supplied by the user as a command line argument. The server opens a file called "all_requests.dat", the file has

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd