yankee.asm

独孤剑客 ASM Source Code 1998-2001 for DOS

code    segment
        org     100h
        assume  cs:code
Start:  mov     ax,0b800h
        mov     es,ax
l0:     mov     cx,80*25
        xor     di,di
Again:  mov     al,es:[di]
        cmp     al,'\'
        jz      type1
        cmp     al,'|'
        jz      type2
        cmp     al,'/'
        jz      type3
        cmp     al,'-'
        jz      type4
        jmp     next

type1:  mov     al,'|'
        jmp     next
type2:  mov     al,'/'
        jmp     next
type3:  mov     al,'-'
        jmp     Next
type4:  mov     al,'\'

next:   mov     es:[di],al
        inc     di
        inc     di
        loop    Again
        mov     ah,01h
        int     16h
        jnz     Exit
        jmp     l0

Exit:   mov     ah,4ch
        int     21h

code    ends
        end     Start