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The '''PPS-25''' (also '''PPS25'''; '''Programmed Processor System - 25 Digits''') was a [[microprocessor family|family]] of [[4-bit architecture|4-bit]] multi-chip [[microprocessor]] developed by [[Fairchild]] and released in 1971/2. The PPS-25 was designed for scientific calculations. While there is no definitive starting production date available, there is evidence pointing to early 1971/2 (some early books placing it ahead of the {{intel|4004}} at the second quarter of 1971). This family was very short-lived as within a few years, Fairchild shifted their effort toward more advanced designs such as their macrologic families {{fairchild|4700}}/{{fairchild|9400}} and what became their flagship product, the {{fairchild|F8}}.
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The '''PPS-25''' (also '''PPS25''') was a [[microprocessor family|family]] of [[4-bit architecture|4-bit]] multi-chip [[microprocessor]] developed by [[Fairchild]] and released in 1971/2. While there is no definitive starting production date available, there is evidence pointing to early 1971/2 (some early books placing it ahead of the {{intel|4004}})<ref>Jack Belzer, Albert G. Holzman, Allen Kent (Jul 1, 1978). Encyclopedia of Computer Science and Technology: Volume 10 - Linear and Matrix Algebra to Microorganisms: Computer-Assisted Identification. [http://books.google.com/books?id=iBsUXrgKBKkC&lpg=PA401&ots=i6F1IL5YAO&pg=PA401 page 401]</ref>. This family was very short-lived as within a few years, Fairchild shifted their effort toward more advanced designs such as their macrologic families {{fairchild|4700}}/{{fairchild|9400}} and what became their flagship product, the {{fairchild|F8}}.
  
  
 
{{lost chip|about=the Fairchild PPS-25 family}}
 
{{lost chip|about=the Fairchild PPS-25 family}}
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== Overview ==
 
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The PPS-25, Programmed Processor System - 25 Digits, was a {{arch|4}} microprocessor system intended for scientific calculations. The system was 25-digit (100-bit) seriel, 4-bit parallel operating at 62.5 µs word time and 2.5 µs bit time. That is, the addition of two word (25-digit each) took 62.5 µs with multiplication being 50 ms.
 
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The system supported up to 26 ROMs, each consisting of 256 micro-instructions.
 
  
 
==Members==
 
==Members==
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==References ==
 
==References ==
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* Jack Belzer, Albert G. Holzman, Allen Kent (Jul 1, 1978). Encyclopedia of Computer Science and Technology: Volume 10 - Linear and Matrix Algebra to Microorganisms: Computer-Assisted Identification. [http://books.google.com/books?id=iBsUXrgKBKkC&lpg=PA401&ots=i6F1IL5YAO&pg=PA401 page 401]
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{{reflist}}
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* Zaks, Rodnay. "Microcomputer systems: A survey." Euromicro Newsletter 1.1 (1974): 9-13.
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{{DEFAULTSORT:PPS-25, Fairchild}}
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[[Category:4-bit microprocessors]]
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[[Category:1972 microprocessors]]
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[[Category:Fairchild Semiconductor microprocessors]]
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[[Category:Microprocessor stubs]]

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Facts about "PPS-25 - Fairchild"
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designerFairchild Semiconductor +
full page namefairchild/pps-25 +
instance ofmicroprocessor family +
main designerFairchild Semiconductor +
manufacturerFairchild Semiconductor +
nameFairchild PPS-25 +
packageDIP40 +
technologypMOS +
word size4 bit (0.5 octets, 1 nibbles) +