Dave,

Thanks for the tip, I'll try big caps.

Prices are excellent at Futurlec but the support/documentation is sometimes lacking - still a bargain.

I like your MAX set-up (mine is lots of lines of obvious code!) but cant quite follow it:

1. The set-up generally is of the form [Register,Value]
2. Where Register goes from 0 to F
3. And value is byte sized

4. What is your variable 'a' ?
5. What size is the variable 'Max_dat' ?
6. I can't see how you are writing 'Register' and 'Data' to the MAX?

Regards Bill Legge