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print corresponding ascii for letters

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Join Date: Jan 2007

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brian.p

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print corresponding ascii for letters

Jan 27th, 2007

 Help with Code Tags 
 Assembly Syntax (Toggle Plain Text) 
 ; Description: Program to input a character and then output it to the screen
 ; Registers used:   ax, dx
 .model small
 .stack 100h
 .data
.code
 
        mov ah, 02h      ; DOS function call 2, character output
 mov dl, 41h       ; the character 041h (i.e.'A')
        mov cx, 26              ; start the counter at 26 in cx
again: int 21h          ; print character
 inc dl           ; the next character into dl
 loop again           ; subtract 1 from cx, if not zero jump back to again
finish:       mov ax, 4C00h  ; Terminate program
               int 21h   ; correctly
 
end
 ; Description: Program to input a character and then output it to the screen
 ; Registers used:   ax, dx
 .model small
 .stack 100h
 .data
.code
 
        mov ah, 02h      ; DOS function call 2, character output
 mov dl, 41h       ; the character 041h (i.e.'A')
        mov cx, 26              ; start the counter at 26 in cx
again: int 21h          ; print character
 inc dl           ; the next character into dl
 loop again           ; subtract 1 from cx, if not zero jump back to again
finish:       mov ax, 4C00h  ; Terminate program
               int 21h   ; correctly
 
end

The above loops from capital A to Z and prints out all charaters.What I'm wondering is could the above loop be used to print out A-Z and its corresponding ASCII value (e.g)

A 65
B 66
C 67

I'm guessing I'll need a unconditional loop,and some sort of comparison check...anyones input as to how I would go about coding this would be very much appreciated.Thanks.

Last edited by brian.p; Jan 27th, 2007 at 6:56 am.

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Re: print corresponding ascii for letters

Jan 31st, 2007

 Help with Code Tags 
 Assembly Syntax (Toggle Plain Text) 
string    db   4 dup( ' ' ), '$'
 
mov al, 41h ; the character 041h (i.e.'A')
mov cx, 26 ; start the counter at 26 in cx
 
again:
push ax                                    ;save character
mov string[ 0 ], al                     ;copy character to start of string
mov bh, 10
div bh                                      ;MS digit of ascii code into al, LS digit into ah
add ax, '00'                              ;convert digits into ascii codes
mov word ptr string[ 2 ], ax       ;copy digits into string
mov ah, 9                                ;print string
int 21h
pop ax                                     ;retrieve character
inc al                                       ;next character
loop again ; subtract 1 from cx, if not zero jump back to again
finish: mov ax, 4C00h ; Terminate program
int 21h ; correctly
string    db   4 dup( ' ' ), '$'
 
mov al, 41h ; the character 041h (i.e.'A')
mov cx, 26 ; start the counter at 26 in cx
 
again:
push ax                                    ;save character
mov string[ 0 ], al                     ;copy character to start of string
mov bh, 10
div bh                                      ;MS digit of ascii code into al, LS digit into ah
add ax, '00'                              ;convert digits into ascii codes
mov word ptr string[ 2 ], ax       ;copy digits into string
mov ah, 9                                ;print string
int 21h
pop ax                                     ;retrieve character
inc al                                       ;next character
loop again ; subtract 1 from cx, if not zero jump back to again
finish: mov ax, 4C00h ; Terminate program
int 21h ; correctly

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brian.p

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Re: print corresponding ascii for letters

Mar 23rd, 2007

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Originally Posted by mathematician

Help with Code Tags

Assembly Syntax (Toggle Plain Text)
string    db   4 dup( ' ' ), '$'
 
mov al, 41h ; the character 041h (i.e.'A')
mov cx, 26 ; start the counter at 26 in cx
 
again:
push ax                                    ;save character
mov string[ 0 ], al                     ;copy character to start of string
mov bh, 10
div bh                                      ;MS digit of ascii code into al, LS digit into ah
add ax, '00'                              ;convert digits into ascii codes
mov word ptr string[ 2 ], ax       ;copy digits into string
mov ah, 9                                ;print string
int 21h
pop ax                                     ;retrieve character
inc al                                       ;next character
loop again ; subtract 1 from cx, if not zero jump back to again
finish: mov ax, 4C00h ; Terminate program
int 21h ; correctly
string db 4 dup( ' ' ), '$' mov al, 41h ; the character 041h (i.e.'A') mov cx, 26 ; start the counter at 26 in cx again: push ax ;save character mov string[ 0 ], al ;copy character to start of string mov bh, 10 div bh ;MS digit of ascii code into al, LS digit into ah add ax, '00' ;convert digits into ascii codes mov word ptr string[ 2 ], ax ;copy digits into string mov ah, 9 ;print string int 21h pop ax ;retrieve character inc al ;next character loop again ; subtract 1 from cx, if not zero jump back to again finish: mov ax, 4C00h ; Terminate program int 21h ; correctly

thanks for the help,and sorry for my late reply...

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Re: print corresponding ascii for letters

Mar 23rd, 2007

If you use a mutant form of AAM or AAD (I forget which right now) that uses 16 as its base rather than 10, it will cleanly split the nibbles in AL into AH and AL.

IOW - 0x35 would become 0x0305