Just add 5 ICs; UB 6, 7 and 8 and UC 6 and 7, and change the jumpers appropriately.
Yeah, sorry, I should have mentioned that as well, also to remap the keyboard.IIRC, you'll also need to change the EDIT ROM to initialize the CRTC for 80 columns.
I hate to argue and it is a little confusing, but not really; it works with two of the three 80 column 'universal' boards (or converted 40 column versions) but it does not turn a 40 column board into an 80 column oneSteve's board works on both 40 & 80 col, you have to check the revision of the main board. Info is on his site.
When the 4.0 ROM set was released in 1980, the The 2001-N machines with 9 inch screens and no CRTC chips started shipping with 4.0 and were re-badged as 4016/4032Btw, what is a 'FAT 40'?