On Sat, 14 Jan 2017, Chuck Guzis wrote: > Given all of that, the 1620 did perform lots of useful work. Later > versions of the machine after the CADET added functionality, but AFAIK, > never addressed the problem of the inability to read the P-counter from > a program. half a century ago, there was a 1401 emulator that ran on the 1620, and PDQ FORTRAN.