On 4/12/2010 11:23 AM, Mark McDougall wrote: > OK, thanks. Must be something I'm doing wrong then... ;) Hmmm... still think HDBDOS is writing to $FF7F?!? Time to break out MESS... Regards, -- | Mark McDougall | "Electrical Engineers do it | <http://members.iinet.net.au/~msmcdoug> | with less resistance!"