HP FOCUS
The
32-bit competitors (DEC, IBM, Prime Computer, etc.) used multi-chip bit-slice-CPU designs, while single-chip designs like the Motorola 68000
were a mix of 32 and 16-bit.
Introduced in the Hewlett-Packard
stack architecture,[3] with over 220 instructions (some 32 bits wide, some 16 bits wide), a segmented memory model, and no general purpose programmer-visible registers.[4] The design of the FOCUS CPU was richly inspired by the custom silicon on sapphire
(SOS) chip design HP used in their HP 3000 series machines.
Because of the high density of HP's
The Focus CPU is microcoded with a 9,216 by 38-bit microcode control store. Internal data paths and registers are all 32-bit wide. The Focus CPU has a transistor count of 450,000 FETs.[3][7]
References
- ^ Wheeler, John K.; Spencer, John R.; Beucler, Dale R.; Kohlhardt, Charlie G. (August 1983). "128K-Bit NMOS Dynamic RAM with Redundancy". Hewlett-Packard Journal. 34 (8): 20–24. Retrieved 6 October 2020.
- ^ Beyers, Joseph W.; Zeller, Eugene R.; Seccombe, S. Dana (August 1983). "VLSI Technology Packs 32-Bit Computer System into a Small Package". Hewlett-Packard Journal. 34 (8): 3–6. Retrieved 6 October 2020.
- ^ a b Burkhart, Kevin P.; Forsyth, Mark A.; Hammer, Mark E.; Tanksalvala, Darius F. (August 1983). "An 18-MHz, 32-Bit VLSI Microprocessor". Hewlett-Packard Journal. 34 (8): 7–8, 10, 11. Retrieved 6 October 2020.
- ^ Fiasconaro, James G. (August 1983). "Instruction Set for a Single-Chip 32-Bit Processor". Hewlett-Packard Journal. 34 (8): 9–10. Retrieved 6 October 2020.
- ^ Mikkelson, James M.; Fei, Fung-Sun; Malhotra, Arun K.; Seccombe, S. Dana (August 1983). "NMOS-III Process Technology". Hewlett-Packard Journal. 34 (8): 27–30. Retrieved 6 October 2020.
- ^ Malhotra, Arun K.; Leinbach, Glen E.; Straw, Jeffery J.; Wagner, Guy R. (August 1983). "Finstrate: A New Concept in VLSI Packaging". Hewlett-Packard Journal. 34 (8): 24–26. Retrieved 6 October 2020.
- ^ a b "OpenPA: HP 9000/500 FOCUS". Paul Weissmann. Retrieved February 25, 2005.
- "HP Computer Museum: Technical Desktops: Series 500". See "Product Documentation". for HP Journal articles.
- "HP 9000" (PDF). HP Journal. 34 (8). August 1983.
- Beyers, J.W.; Dohse, L.J.; Fucetola, J.P.; Kochis, R.L.; Lob, C.G.; Taylor, G.L.; Zeller, E.R. (October 1981). "A 32-bit VLSI CPU chip". IEEE Journal of Solid-State Circuits. 16 (5): 537–542. S2CID 21460202.
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