CODEWITHSUNDEEP
assembly
Amirhossein Naghshzan
Amirhossein Naghshzan

Reputation: 1180

Font of DOS in assembly language

I wrote a program with assembly language in DOS and after running it the font of DOS gets more larger, any idea how to solve this?

Upvotes: 1

Views: 1212

Answers (1)

Igor Skochinsky
Igor Skochinsky

Reputation: 25318

If you're using int 10h service to change the screen mode (function AH=00h), you should save the old mode at the start of your program and restore it before exiting. You can query the current mode with int 10h AH=0Fh (mode is returned in AL).

Here's a random example from Google:

;; read current video mode and save
        mov ah,0fh
        int 10h
        mov vmode,al
        mov vpage,bh
;; set video mode
        mov ah,0
        mov al,VIDMOD
        int 10h

        [....]

;; restore old video mode
        mov bh,vpage
        mov al,vmode
        mov ah,0
        int 10h

        mov ax, 4c00h   ;exit
        int 21h

Upvotes: 4

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