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z/XDC Release z2.1 is now GENERALLY AVAILABLE

ColeSoft is excited to announce the general availability of z/XDC Release z2.1 – some two years in the making.  Here are the highlights:

The Hook Command has been completely re-written to allow Hooks to be placed in “non-SVC-friendly” environments such as  PC routines, SRB routines, FRR-protected code, locked code and the like! Also, new parameters allow the user to target address spaces that do not yet exist. This rewrite removes most previous limitations on Hooks.

Automapping:  z/XDC will now automatically map modules and csects when execution reaches them for the first time in a debugging session.  The MAP command no longer needs to be issued explicitly.

Improved Breaking Event Address (“BEA”) Support: The LIST BEA command produces a one-line display showing the Breaking Event Address. The BEA is a handy device for understanding bugs arising from wild branches.  Also, the LIST BEA command has been added to some of z/XDC’s Factory Default Watch Windows.

LIST OPERANDS: This is a new command that can be used to show the before- and after- values of data touched by machine instructions as you step execution through your program.

Crosslinks:  z/XDC’s Built-in Help has long had thousands of crosslinks that connect words and paragraphs to topics related to the immediate discussion. Now, those crosslinks have been propagated into the PDF versions of the Help. This significantly improves the usefulness of the PDFs.

 New Learning Resources

Training Videos: Dave Cole has created a series of YouTube training videos that help users to get more out of the product. You can find our channel at We expect to be adding new videos constantly.

z/XDC Forum: ColeSoft also has created a z/XDC User’s Group on LinkedIn. This is intended to be the go-to place for all things z/XDC: Release and event announcements, maintenance information, how-to’s, questions asked and answered, everything.  You can find the forum by searching LinkedIn for “z/XDC Users Group”, or (more easily) just go to

Documentation: New editions of all manuals  can be found at our web site:

New Quick Reference and z/XDC Primer: Bob Shimizu has substantially re-written these two documents, updating them with current screenshots and all the new commands.  These too can be found on our website.



ColeSoft Marketing is dedicated to the continued development of diagnostic and measuring tools for sophisticated software engineers, applications programmers, capacity planners and systems programmers working on the z/OS® mainframe computing platform.

Our customers are among the world’s foremost software development houses and Fortune 500 companies. These hard-working companies collectively support the data processing activities of most of western civilization.

If your insurance bill came on time and was correct, if your banking statement was accurate, if your utility bill was processed correctly, then a mainframe computer was involved and we had a small part in guaranteeing the accuracy of the results.  We’re like “tool-and-die” makers for the software industry – one step removed but deeply involved.

We offer z/XDC – the premier debugging tool for z/OS-based Assembler programmers.  This is our flag-ship product, which is highly regarded in the software development and Fortune 500 communities.

You can learn more about our products here at this site.  Feel free to explore.  If you need to reach us, we’re very easy to reach.  Welcome to ColeSoft!