
sm segment:offset af -> byte becomes 00
sm segment:offset bf -> byte becomes BF (OK)
sm segment:offset cf -> byte becomes 00
sm segment:offset df -> byte becomes 00
sm segment:offset ef -> byte becomes EF (OK)
sm segment:offset ff -> byte becomes FF (OK)
Same behaviour with "sm segment offset" syntax.
If you need more details or something you can ask, or if I can do something for fixing it.
Regards.