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Thread: DEC 6502 Cross-assembly

  1. #11


    We are in the information ( lost ) age.

  2. #12
    Join Date
    Sep 2006
    Silicon Valley


    Quote Originally Posted by g4ugm View Post

    I know some of the missing stuff was mounted on one of the group servers, so it might be there...

    There was a downloading frenzy about a month ago when they put that disk back on line at

    I pulled down a copy. It's about 3.9gb with many DECUS SIG tape images.

    When I did that I read all of the remaining DECUS SIG 1/2" tapes that I still have, mostly duplicates of what
    they had along with a few from DECUS Canada. I haven't had time to put those up yet.

  3. #13


    Thanks! That looks like a very interesting site indeed, so I'm going to dig into it a bit more this weekend. I have the DEQNA working on my machine so I do finally have Internet access. I haven't done much with it yet beyond verifying I can access my internal FTP site though. The system is an 11/23 with 256kw of RAM (Q1. Maybe I can try text-based email with that or maybe browsing using Telnet. Open to ideas...

  4. #14


    Quote Originally Posted by g4ugm View Post
    Well originally the DECUS library was a collection of physical media. From what I remember you paid DECUS for a copy of what you wanted which meant that no one other than DECUS had a complete library. The charges for a copy were not insignificant, so you only got a copy of what you needed, meaning not many copies exist. At some point DECUS discarded the whole caboodle and much was lost. I have no idea why they binned it, but that is why there isn't a complete on-line. Its very frustrating as a lot of interesting stuff appears lost.
    You could also get the software from the contributor directly if they were willing. The DECUS library had this mantra that "the only charges are for the media and the labor to create the copies", yet you could spend a lot of money ($100 for a 9-track tape? Really?) so people only bought things they knew they could use. The cost discouraged buying things on the chance that they might be useful. I caused quite a fuss about the library charges which led to some price reductions. I don't know if they were counting kilobytes as feet of paper tape and using the same pricing metric into the magtape era or what the deal was.

    I believe the SIG Tapes were at least partially in response to DECUS Library pricing - people contributed software, volunteers organized and cataloged it, and passed it down a "reverse pyramid" where people would make copies and send them to more people who would then do the same, and so on.

    When NADGUG (the North American Data General User's Group) folded, they sent all the members unsolicited magtapes with everything the library ever held.

  5. #15


    One the general topic of cross assemblers hosted on DEC machines, there was a suite of cross assemblers targeting various microprocessors that was available from a company called "Boston Systems Office" back in the early 1980's.
    The company that I worked for at the time used their 6809 cross assembler on a PDP-11 running V7 UNIX - I believe that they also had versions that ran under VMS.

  6. #16
    Join Date
    Jun 2012
    UK - Worcester


    We used the BSO Z80 cross-assembler on a PDP-11 running RSX-11/M+.

    SDL also had an 8086 cross-assembler that we used as well. Found a bug in it last year... Had to produce a work-around after all this time...


  7. #17
    Join Date
    Jan 2007
    Pacific Northwest, USA
    Blog Entries


    There was a raft of cross-assemblers written in FORTRAN to be (relatively) platform-independent (I wrote a couple myself). You might count those as well.


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