Michel Jacquot asked about 16C84 disassemblers.  Try these:

ftp://ftp.informatik.uni-erlangen.de/
pub/multimedia/tv-crypt/microcontroller/picdis12.zip

http://www.demon.co.uk/paulmax/stegen/files/disasm84.zip

http://aix2.uottawa.ca/~s721099/pic/84dis10.zip

http://www.lpilsley.demon.co.uk/eedisasm.zip
(see also ftp://mchipbbs.microchip.com/library/3rdparty).

http://www.jyu.fi/~trossi/pic/

Have fun.

David
--
http://www.man.ac.uk/~mbhstdj