Semiconductor & Computer Engineering
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Difference between revisions of "fairchild/pps-25"
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| production start = 1971 | | production start = 1971 | ||
| arch = 4-bit | | arch = 4-bit | ||
| − | | word = 4 | + | | word = 4 bit |
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| tech = pMOS | | tech = pMOS | ||
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| package = DIP40 | | package = DIP40 | ||
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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}}) | + | 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}}. |
{{lost chip|about=the Fairchild PPS-25 family}} | {{lost chip|about=the Fairchild PPS-25 family}} | ||
| + | |||
| + | == Overview == | ||
| + | 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. | ||
| + | |||
| + | The system supported up to 26 ROMs, each consisting of 256 micro-instructions. | ||
==Members== | ==Members== | ||
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! Part !! Description | ! Part !! Description | ||
|- | |- | ||
| − | | {{\|3805}} || [[ALU]] | + | | {{\|3805}} || [[ALU]] |
|- | |- | ||
| {{\|3806}} || Control and timing unit | | {{\|3806}} || Control and timing unit | ||
| + | |- | ||
| + | | {{\|3808}} || Memory | ||
| + | |- | ||
| + | | {{\|3810}} || Program ROM | ||
|} | |} | ||
==References == | ==References == | ||
| − | + | * 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] | |
| − | + | * Zaks, Rodnay. "Microcomputer systems: A survey." Euromicro Newsletter 1.1 (1974): 9-13. | |
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Latest revision as of 22:48, 10 July 2017
| Fairchild PPS-25 | |
.svg)
| |
| Developer | Fairchild Semiconductor |
| Manufacturer | Fairchild Semiconductor |
| Type | microprocessors |
| Production | 1971 |
| Architecture | 4-bit |
| Word size | 4 bit 0.5 octets
1 nibbles |
| Technology | pMOS |
| Clock | 400 kHz |
| Package | DIP40 |
The PPS-25 (also PPS25; Programmed Processor System - 25 Digits) was a family of 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 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 4700/9400 and what became their flagship product, the F8.
 |
Help! This article is about the Fairchild PPS-25 family that has lost in the mists of time. Please help use restore and preserve this info! If you have more information pertaining to this chip please consider editing this page or posting that info on its discussion page (e.g. datasheet, manuals, catalogs, or any other literature on the subject would be help greatly). |
Overview[edit]
The PPS-25, Programmed Processor System - 25 Digits, was a 4-bit 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.
The system supported up to 26 ROMs, each consisting of 256 micro-instructions.
Members[edit]
| Family Members | |
|---|---|
| Part | Description |
| 3805 | ALU |
| 3806 | Control and timing unit |
| 3808 | Memory |
| 3810 | Program ROM |
References[edit]
- 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. page 401
- Zaks, Rodnay. "Microcomputer systems: A survey." Euromicro Newsletter 1.1 (1974): 9-13.
Facts about "PPS-25 - Fairchild"
| designer | Fairchild Semiconductor + |
| full page name | fairchild/pps-25 + |
| instance of | microprocessor family + |
| main designer | Fairchild Semiconductor + |
| manufacturer | Fairchild Semiconductor + |
| name | Fairchild PPS-25 + |
| package | DIP40 + |
| technology | pMOS + |
| word size | 4 bit (0.5 octets, 1 nibbles) + |