thanks for new links. about keyboards, thing is that most of them have MCU (micro controller unit) that mostly have protected rom content, so in most of cases we simulate them, and this is case in "detached" keyboards (since they use serial communication over a cable), "integrated" keyboards mostly have some kind of simple matrix and supported electronics for direct read.

As I see in technical documentation there is 24K rom in form of 3 * 8K and also 4K rom for char gen, video chip is same as in VT100 so that is good since we made it already.

So we need those 4 chips dumped in this case.