Andrew Mattingly

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CSRCESRV SERVICE=EXPAND for 64-bit callers

WARNING: This is not an interface, which is to say that IBM does not document the format of data compressed using the CSRCESRV macro....

Find "where" z/OS system initialization parameters are defined

It can be difficult, particularly for occasional systems programmers such as zPDT or zD&T users, to find the PARMLIB member where a particular z/OS system...

Create a "which" command for z/OS PROCs

Some z/OS installations have complex PROCLIB concatenations, making it time-consuming and error-prone to find the PROCLIB from which a particular PROC will be loaded. ...

Using the New DEFLATE Instruction in z15

We explore invoking and tuning the DFLTCC machine instruction in z15 to optimise data compression using the DEFLATE algorithm. We use a wrapper written...

Linking to a 31-bit load module from a 64-bit z/OS application

When you start to write 64-bit applications in a high-level language, like C, you may find that utilities or callable services that you need are...

Creating a shim to call 64-bit z/OS system services from 31-bit applications

System services that have been added to z/OS in recent times are increasingly being offered only as a 64-bit interface. This presents a problem...

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