Yes, 60 bits one's complement, oddball floating point format, 12 bit one's complement I/O processors... Your memory is quite good. That's just how it works, in all the various OSs I know. BTW, there exists an emulator -- DtCyber ("Desktop Cyber"). paul On Jul 13, 2011, at 11:08 AM, <hvlems at zonnet.nl> wrote: A CDC 6000 no less, that's a 60 bit architecture right? SCOPE (?) is somewhat arcane though. I remember entering an Algol program and then compiled it. Somebody asked a question and having forgotten what I'd done, tried to compile again. The OS said: No such file or at end of file. The user had to type the REWIND command. The compiler could then read the sourcefile again :-) ------Origineel bericht------ Van: Paul Koning Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: Re: [HECnet] Towards the Mouth of Madness.... Verzonden: 13 juli 2011 16:52 On Jul 13, 2011, at 9:39 AM, <hvlems at zonnet.nl> wrote: Ah, so that's your specification for an interesting system: weird with DECnet :-) Apart from the DECnet requirement, if you want weird I don't think you can top a CDC 6000 series machine. The size can be a bit problematic, I suppose. My dream (about 10% complete) is to build a replica in an FPGA. I have the schematics to do it, it's just a whole lot of work... paul Verzonden vanaf mijn draadloze BlackBerry -toestel