It would seem 4 4-bit word register files are all you could obtain from TI (<a href="http:&#x2F;&#x2F;www.ti.com&#x2F;product&#x2F;sn74ls670);" rel="nofollow">http:&#x2F;&#x2F;www.ti.com&#x2F;product&#x2F;sn74ls670);</a> I haven&#x27;t dug deeper, but yeah as a bread-board layout you would need a lot of surface area to simulate even the smallest Mill. Cool idea though.