Jon Gentil wrote:
> THETSR PROC NEAR
>     MOV AH, 03h                      ;Function 3 (Check serial status)
>     XOR AL, AL                       ;Clear AL
You need to save and restore registers..
THETSR PROC NEAR
        pusha
        push dx
        push es
        ...........
        pop es
        pop dx
        popa
        jmp cs:[Old_Int]
... The Moon is Waning Crescent (1% of Full)
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