so, I want to avoid using int 21h and start working with BIOS level code. I'm trying to write something equivalent to int 21h, function 09h, using int 10h functions 09h, 03h, and 02h, except I want the reading to terminate when it reaches a 00h character, switch to green text when it reaches a 02h character, and switch back to normal when it reaches a 01h character.
Here is my code:
outp proc
push cx
push ax
push bx
push dx
xor cx,cx
xor bx,bx
nxchr: add dx,cx
mov al,[dx]
cmp al,00h
jz stwrt
cmp al,01h
jnz skp01
mov attrCUR,attrWHT
skp01: cmp al,02h
jnz skp02
mov attrCUR,attrGRN
skp02: mov ah,09h
mov bl,attrCUR
push cx
xor cx,cx
int 10h
pop cx
inc cx
mov ah,03h
int 10h
inc dl
mov ah,02h
int 10h
jmp nxchr
stwrt: pop dx
pop bx
pop ax
pop cx
ret
outp endp
to use this I would set dx to the offset of the beginning of the string andthen call outp.
I'm getting the error that mov al,[dx] is an "illegal indexing mode," and that mov attrCUR,attrWHT and mov attrCUR,attrGRN are illegal memory references, although now that I look at it I can see exactly why. Anyways, how can I move the contents of the memory location in dx into the al register?
Also, I changed mov attrCUR,attrWHT to "mov attrCUR,[offset attrWHT]" and it said constant too large... how do I fix this?
help please...thanks in advance.
----edit----
fixed the mov attrCUR,attrWHT problem... just put the value into bl directly instead of using a memory location intermediate.
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