More on Re: Insulating D-shell from chassis? Xylotex board

Reading the Xylotex data and looking at pictures of the board, I feel
pretty confident of two items. One the board is based on the Allegro
A3977 chip, I also don't see what looks to be any other logic on the
board. Straight from the 3977 Data sheet - "to avoid problems due to
capacitive coupling" snip "always drive the logic inputs with a low
source impedence to increase noise immunity". I'd like to buy a 3977
controller board but have passed on both the Xylotex and THS board
because they didn't have any logic on board driving at minimum the
step, direction and enable lines. Resolved to designing my own.