programming langauge is x86 MASM Write a program in assembly masm that converts

Question

programming langauge is x86 MASM

Write a program in assembly masm that converts ascii to integer and can handle any character in the string. if  string is "1234h" then V = 4660.

I started the code the check portion of the code should check each character of the string. below is the code I started the code below the check can convert 0-9 but the code should be able to handle any character. use 80x86 Assembly (MASM) instructions to implement procedures using stack frames. Use a procedure called str2hex. Pass the value of offsets of the expression and V to the procedure. The expression should be null-terminated so that you know the end of the expression. e.g.:
express    DB "A + B" , 0    ; 0 is used to mark end of the string.

.MODEL SMALL ;one data and one code segent
   .386 ;enables 32-bits
   .STACK ;defines memory (default 1024)
   .DATA
X DWORD "1234",0
V DWORD 10 DUP (?)
.CODE ;start of code segment
MAIN PROC FAR ;defines a procedure and a distance
.STARTUP
   ;HEX TO DEC

MOV ECX, LENGTHOF X
CHECK:
   CMP X[SI],20H
   JE DONE
   CMP X[SI],22H
   JE DONE
   CMP X[SI],27H
   JE DONE
   CMP X[SI],41H
   JB DONE
   CMP X[SI],5BH
   JB UPPER_CASE
   CMP X[SI],61H
   JB DONE
   CMP X[SI],7BH
   JG DONE
   CMP X[SI],30H
   JE COMPLETE
UPPER_CASE ;converts to uppercase
   SUB X[SI],20H
   JMP DONE
DONE:
   INC SI
   LOOP CHECK

;this portion of code converts 0-9
     
   MOV CX,0
   MOV BX,10

L1: MOV DX,0
   DIV BX
   ADD DL,30H
   INC CX
   CMP AX,9
   JG L1
   ADD AL,30H
   MOV [SI],AL

   ADD AL,30H ;FINAL BIT LOCATED WITH IN AL
   MOV [SI], AL ;MOVES AL IN MEMORY LOACTION OF SI

COMPLETE:

  
.EXIT ;exit to DOS
MAIN    ENDP ;end main procedure directive
   END

Explanation / Answer

Try this code for your reference

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