习题 4.9

.model small
.data
bufX DB 77h
bufY DB 43h
bufZ DB ?
.code
main PROC
    mov ax,@data
    mov ds,ax
    mov al,bufX
    cmp al,bufY
    ja DONE
    mov al,bufY
DONE:
    mov bufZ,al
    mov ah,4ch
    int 21h
main ENDP
END main

习题 4.10

.model small
.data
bufX DW 07dh
signX DB 0ffh
.code
main PROC
    mov ax,@data
    mov ds,ax
    mov al,bufX
    or al,al
    js DONE
    NOT signX
DONE:
    mov ah,4ch
    int 21h
main ENDP
END main

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