Hardware Documentation - Chips - HP
Hewlett-Packard
Here are some links to information about Hewlett-Packard chips.
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PA-RISC architecture and instruction set reference manual
Provides pointers to documentation for the PA-RISC 1.1 and 2.0 architecture as used in HP9000 and HP3000 machines.
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Information and technical descriptions of HP PA-RISC based systems.