Mainframe, MVS and zOS Discussion

You're in luck, IBM has prepared two assembler courses and there's a third one coming up this autumn. These two give you the basics: https://mainframeskillsdepot.ibm.com/search?q=assembler Then if you want to read books for free, there's at least three authors you might want to look up: David Woolbr...

SORTL (opcode 'B938') is a special instruction that calls DFSORT. Per the documentation, it needs at least z version 15 and the facility needs to be enabled. In the Principles the instruction is documented on page 26-96. Sorting fixed or variable length records requires you to give it a set of param...