PA-7100
The PA-7100 is a microprocessor developed by Hewlett-Packard (HP) that implemented the PA-RISC 1.1 instruction set architecture (ISA).  It is also known as the PCX-T and by its code-name Thunderbird.  It was introduced in early 1992 and was the first PA-RISC microprocessor to integrate the floating-point unit (FPU) on-die.  It operated at  and competed primarily with the Digital Equipment Corporation (DEC) Alpha 21064 in the workstation and server markets. PA-7100 users were HP in its HP 9000 workstations and Stratus Computer in its Continuum fault-tolerant servers.

It was based on the PA-7000 (PCX-S) chip set, a previous PA-RISC implementation consisting of a microprocessor and FPU. The PA-7100 contains  and measures  for an area of   It was fabricated by HP in their CMOS26B process, a  complementary metal–oxide–semiconductor (CMOS) process. The PA-7100 is packaged in a 504-pin ceramic pin grid array that has a copper-tungsten heat spreader.

An improved PA-7100, the PA-7150 was introduced in 1994. It operated at  due to improved circuit design. It was fabricated in the same CMOS26B process as the PA-7100.

Both microprocessors were fabricated at HP's Corvallis, Oregon and Fort Collins, Colorado fabrication plants.

The PA-7100LC and PA-7200 microprocessors were also based on the PA-7100.

Notes

References 
 PA-7100 PA-RISC Processor OpenPA.net
 Asprey, T. et al. (June 1993). "Performance features of the PA7100 microprocessor". IEEE Micro. pp. 22–35.
 Chan, Kenneth K. et al. (February 1996). "Design of the HP PA 7200 CPU". Hewlett-Packard Journal.
 DeLano, E. et al. (1992). "A high speed superscalar PA-RISC processor". Proceedings of Compcon. pp. 116–121.
 DeTar, Jim (20 December 1993). "HP spins PA-RISC architecture; part of five-year roadmap". Electronic News.
 Gwennap, Linley (7 March 1994). "PA-7200 Enables Inexpensive MP Systems". Microprocessor Report.
 Heikes, C. (1994). "A 4.5 mm2 multiplier array for a 200 MFLOP pipelined coprocessor". ISSCC Digest of Technical Papers. pp. 290–291.
 Yetter, J. et al. (1992). "A 100 MHz superscalar PA-RISC CPU/coprocessor chip". 1992 Symposium on VLSI Circuits. pp. 12–13.

HP microprocessors
Superscalar microprocessors
32-bit microprocessors