An FPGA 705 would be much, much easier than a tube 6502 (which would be kind of crazy). I know of FPGA versions of the IBM 1130 and 360, so putting old computer

An FPGA 705 would be much, much easier than a tube 6502 (which would be kind of crazy). I know of FPGA versions of the IBM 1130 and 360, so putting old computers on FPGA is possible. An FPGA 705 would be even easier since it is a fairly simple machine. A TTL version would also be an interesting project.