OT: how big would it be?

Well, I can't deny this... According to the intel Web site an 8080 has about 6000 Transistors. Now, it is possible to put up some 12 to 16 FF gates in discrete logic (discrete non SMD transistors etc.) gates (~40 Transistors) onto one Euro-Card board (I tid once build up 16 FFs on one board - at the age of 16, I tried to miniaturize :). So, spreading 6000 transistors at 40 transistors per board gives some 150 boards. And with an asumption of 20 boards per row we need some 8 rows, or a small (half height) rack. As usual YMMV - especialy if you may change the design. And/or build individual boards to maximize the number of transistors per board (and of course try to replace as many as posible by other circuits with less components). For the 6502, the numbers are similar. I don't have a transistor count, but a standard SC02 design consists of roughly 3,300 Gates, adding up to a number like again 6-7,000 Transistors (BTW, the 65sc02 as PLD needs ~2.1k Altera Logic Cells, or ~1k of xilinx LOgic Blocks). Gruss H. P.S.: I scored an unused 8008 Processor last week - among a bunch of other late 70s/early 80s chips... -- Der Kopf ist auch nur ein Auswuchs wie der kleine Zeh. H.Achternbusch