You can try this out, get the assembler here. This is just a simple hexadecimal to binary converter, a CS217 exercise and not supposed to be pasted here but just for the sake of having a post. Here it is:
input:
mov ah, 00h
int 16h
cmp ah, 1ch
je exit
number:
cmp al, '0'
jb input
cmp al, '9'
ja uppercase
sub al, 30h
call process
jmp input
uppercase:
cmp al, 'A'
jb input
cmp al, 'F'
ja lowercase
sub al, 37h
call process
jmp input
lowercase:
cmp al, 'a'
jb input
cmp al, 'f'
ja input
sub al, 57h
call process
jmp input
loop input
process:
mov ch, 4
mov cl, 3
mov bl, al
convert:
mov al, bl
ror al, cl
and al, 01
add al, 30h
mov ah, 02h
mov dl, al
int 21h
dec cl
dec ch
jnz convert
mov dl, 20h
int 21h
ret
exit:
int 20h
“And my God will meet all your needs according to His glorious riches in Christ Jesus.” - Philip 4:19
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