On Jun 10, 2013, at 5:20 PM, Jordi Guillaumes i Pons wrote: El 10/06/2013, a les 23:17, Johnny Billquist <bqt at softjar.se> va escriure: I think I read somewhere than the inspiration for the CP/M commands was RT-11, not TOPS-10. But, anyway, the RT-11 commands _are_ inspired by TOPS-10, which. by the way, sound a little bit like OS/8... :) I haven't read the article (yet), however I'm pretty sure I've seen in the past that CP/M was indeed inspired by TOPS-10, and nothing else. God knows if I can dig up any sources of that, though... The wikipedia is not a 100% reliable source, but... "CP/M's command line interface was patterned after the operating systems from Digital Equipment, such as RT-11 for the PDP-11and OS/8 for the PDP-8." I don't know OS/8. But pre-DCL RT-11 (for example, V2) had a command language very similar to that of TOPS-10. For that matter, you can still see it today in the RT11 RTS that comes with RSTS/E (not surprising because that was written by Anton Chernoff, who also worked on RT11-FB V2 among other things). paul