If you are truly interested in learning System z assembler, then one resource
you could use is the late John Ehrman's book 'Assembler Programming for IBM
System z Servers' - a quick google search should find it for you.
The reason I am posting this is to mention some macros detailed in Appendix B -
using these macros will hide away a lot of the complexity of z/OS I/O so you
can concentrate on all the other details while you learn.
Here is a simple 'Hello world' program using the Printlin macro from this set:
*
* Hello world
*
Hello csect
using hello,15
*
PrintLin Heading,l'heading print page hdr
br 14
heading dc Cl28'1 Hello World!'
end hello
By default, Printlin will write the output to the SYSPRINT DD
Kind regards
John
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