DX1 arrived before DX5, hence the way I've compared them.
The mistake you missed showed how I was when I put the thread together. TX816 is an EIGHT module beast, not 6 as I'd said. When you get to my age, suffering from vertigo and insomnia.....
Going through everything, voice by voice is proving to be more...... ZzZzZz.... I get like that!
In amongst all the rubbish I've collected, what did I find? The yellowing pages of the original paper manual, at the bottom of a box. No clue to where my TX7 modules are though.