The Video Course

15 responses to “The Video Course

  1. Jijo John

    Hi Dwoolnright,
    Thanks for this great help. Could you please create some tutorials for Assembler macros?

  2. hoovsj

    Thanks very much for making these materials (and VisibleZ) available!

  3. Eric Woo

    Hi, Dwoolbright; I am taking your video courses which are much better than the other ones I found from youtube. Just want to say a big THANK YOU for all these video courses!


  4. Karthik

    This has been of immense help, a very useful course for learning assembler programming, Thank you very much. Kind Regards Karthik

  5. Narayan Chaudhary

    Amazing content! The best part is you explained it in a very simple way that anyone can easily understand. THANK YOU for sharing your valuable knowledge.

  6. Pingback: Introduction to VSAM for Assembler Programmers: Part 2 | The Punctilious Programmer

  7. This is a comment with feedback on chapter-3.pdf of your book draft at (which doesn’t seem to have replies enabled.)

    As an experienced mainframe developer, the column restrictions required for mainframe assembler are probably second nature to you, but they weren’t so obvious to me.

    I tried cut and pasting your sample code from the pdf and assembling it, and immediately hit a number of problems, because the cut and paste from pdf to text format resulted in all the carefully tuned spaces of your sample being lost. I’d adjusted the spacing after the cut and paste manually, but did not appreciate just how picky the assembler would be about spaces. Examples:

    1. The END ASMSKEL, ended up in column 1, which the assembler did not appreciate.
    2. Continued lines had to start in column 16 (I’d incorrectly put them in column 10.)
    3. The continuation ‘X’ characters had to be in column 72 (I think that I’d used column 71 erroneously.)
    4. The DCB parameters had to be in column 16, but some other things had to be in column 10.

    Note that I was using the Dignus assembler with the LzLabs runtime running on Linux (i.e.: not using an actual mainframe for either assembly, nor runtime), but I’d guess that the columnar issues that caused me trouble are probably common to Dignus and the mainframe assembler.

    In this intro chapter, I’d strongly suggest that you detail the column requirements for various parts of the program. If you did so, it would help out clueless newbie’s like me attempting to learn a bit of zos assember (I have a 30 year Linux and Unix history, where expectations of specific column requirements seems completely insane — provided one isn’t trying to use an abhorrent language like python.)

    ps. The email address listed on your page appears to be invalid.

    • Thanks, Peeter, for taking time to write.
      – There are formatting requirements listed on page 8 in Chapter 3. I wonder if you have an older version of that chapter?
      – Cutting and pasting the pdf is a problem. I’ll add a link to a text file that contains the sample code. I’ll also look for other chapters that need links to other code.
      The email address on my academic site is good. Just in case, it’s

      • Once I got the program running, I continued reading, and sure enough found the column requirements detailed. They were along with text that said “try this yourself”, which I’d already done. The link for text download will probably be helpful for others.

        Re: your email. I thought it was a bounce error, but looking again, it appears that your server explicitly prohibits you from receiving from protonmail addresses:

        : host ASPMX.L.GOOGLE.COM[]
        said: 550-5.7.1 The user or domain that you are sending to (or from) has a policy that 550-5.7.1 prohibited the mail that you sent. Please contact
        your domain 550-5.7.1 administrator for further details. For more
        information, please visit 550 5.7.1 s186si208845wme.195 – gsmtp (in reply to end of DATA command)

  8. James

    most of the source code link does not work

  9. Jijo

    can you make a detailed video on standard entry and exit ?

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