Hello all,I haven't done much with reverse engineering work the PDD1 firmware in a while, I've been too busy with work again. But I did drop everything I have on GitHub if you want to have a look. I've given names to the different registers, and some subroutines in the assembly file. The Hitachi 6301 uses the same opcodes as the Motorola 6800, and is fairly easy to follow.
https://github.com/BiggRanger/Tandy_PDD Darren
