Hi,

I guess this particular version of the 80C154 had some special instruction for A5 because the Honda ECU I disassembled it from uses it about 30 times - or perhaps those Honda engineers new something we don't :). Anyway, as long as it's just a single byte instruction it doesn't really matter what it does and I don't need to rewrite it (although it'd be nice to know it's use).

Cheers for your help guys,

George Ricketts