ALC Programming

The information in the following pages was obtained from green-bar (yes it was green) listings from the early 1970s. While this is mainly MVT days, the information provides good insight in ALC programming.

The sample programs will be completed as time permits. All the sample programs will be tested on the OS/MVS system. The sample programs include:

Example of	Description	Comments
BSAM	Basic sequential access method I/O	Get started reading and writing card images
QSAM	Queued sequential access method I/O
BPAM	Basic partition access method I/O	How to read members from a PDS
TIMER	Timer services with the operating system
WTO	WTO, WTOR, WTL services	How to communicate with the operator
GETMAIN	GETMAIN/FREEMAIN services

and more!

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Last updated: August 12, 2001.