Hey, Im learning assembler and have written as small test program.
the aim of the program is to take a char input from the keyboard and compare it wit "A". This section of the program works. At the start of the program I want to output a message just to prompt for the input, but when I execute the program there seems to be garbage in front of my message. Please help me on how to fix this.
.model small .stack .code jmp start ; go to start of program ;_______________________________ ;Variable declerations message db "Enter Input:","$" ; $ to show end of string for subfunction 9 equal db "=" ;variable holding a = exclaim db "!" ;_______________________________ start: mov ah,09 ; for outputting a string and not a character mov dx,offset message ;dx point s to the adress of string int 21h ;do it input: mov ah,08 ; 08 for keyboard input int 21h mov bl,al cmp bl,65 ;compare bl with 65 which is A jnz output_yes ;there is a difference output_no: ;when theres no difference mov dl,bl ;move bl into dl for print mov ah,02 ;print character int 21h ;do it mov dl,equal int 21h mov dl,65 int 21h jmp exit ; to skip output_yes output_yes: ;what to output when theres a difference mov dl,bl mov ah,02 int 21h mov dl,exclaim int 21h mov dl,equal int 21h mov dl,65 int 21h exit: mov ah,04Ch ; exit function mov al,00 int 21h END