HLASM (High Level Assembler) is IBM's powerful assembler language for the z/Architecture (formerly System/390 and zSeries) mainframe systems. It's used for creating highly optimized and efficient code for operating systems, system utilities, and performance-critical applications where direct control over hardware resources is required. HLASM is essential for tasks such as writing device drivers, customizing system components, and optimizing performance bottlenecks in existing applications.
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