So, how do we go on doing this ?

Well, download the document here for the KB11-C processor boardand start page 1 😎

First board is the M8130 DAP (Data Paths) which contains the 16 bit integer ALU and related multiplexers.

Schematic capture is done.

There is one thing that looks wierd to me in the original schematic, namely, the ALU chips (74S181) A=B ouputs are tied together with a pair of resistors to pull the line up/down, sure looks like a wired or hack...

So I decided to add the possibility to replace this with proper or gates (a 74S02 would add 5.5ns, which I don't think is so much delay that it'd break things)

Same thing happens in the generation of "BUS A=B (15:08) H"

Of course, the board could be populated with more recent parts such as ACT for all functions that currently exist in this family.

I have now started routing the board. about 50% done right now.