I now have a short list of To Do's for IO

One instruction register.

One cell pointer register

Five 4-bit memory nibbles for the pointer ( Just choose 5 to start with )

Brainwarp instruction card read logic

Transistor clock circuit ( this is the oldest To Do )

Add two more rows to the Dmux circuit

Logic for eight Brainwarp instructions

I have the logic circuits down on paper for all but the actual instructions. Those will be the tough nuts to crack :-) But hay, this is what it's all about, learn by building. I can read all the web pages out there but the real learning is in the doing :-)