Many, many of my favorite 74' parts from the old days are no longer made. The MSI parts that were bread-and-butter of this kind of design back then make less-t

Many, many of my favorite 74' parts from the old days are no longer made. The MSI parts that were bread-and-butter of this kind of design back then make less-than-zero economic sense any more. Nobody would design them in, so nobody makes them. Today you can get the basic logic, of course, because a little bit of glue and duct tape is still necessary. And the super basic shift registers and I/O buffers are still useful. But all computation has moved into much more highly integrated chips or FPGAs.