disassembling 6809 issue

[nitrologic]

I am disassembling a 6809 ROM using following:

f9dasm.exe -6809 -offset f000 -out sbc2.s robotronyo\robotron.yoc

The output includes the following line, which is perhaps not valid 6809, decoding of the E4 opcode?

    ANDB    [MAD30]                  ;F021: E4 9F AD 30    '...0'

[polluks]

It's pretty valid
E4: Opcode for ANDB with [extended] indirect addressing.
9F: Postbyte indicating [extended] indirect addressing mode.
AD 30: The 16-bit address (MAD30) being referenced.