IBM PS/2 Model 70

  • Personal System/2 Model 70 386
  • Personal System/2 Model 70 486
 
A PS/2 Model 70 386, with one floppy drive and one hard drive
DeveloperInternational Business Machines Corporation (IBM)
ManufacturerIBM
Product familyPersonal System/2
TypePersonal computer
Release date
  • June 1988 (1988-06) (Model 70 386)
  • December 1989 (1989-12) (Model 70 486)
Lifespan1988–1992
DiscontinuedDecember 1992 (1992-12)
Media1.44 MB 3.5-in floppy disks
CPU
Storage60–160 MB hard drive
GraphicsVideo Graphics Array
Power120/240 VAC ～
RelatedList of IBM PS/2 models

The Personal System/2 Model 70 386 and Personal System/2 Model 70 486 are midrange desktop computers in IBM's Personal System/2 (PS/2) family of personal computers. The PS/2 Model 70 386, released in June 1988, features an Intel 386 microprocessor clocked between 16 MHz and 25 MHz (depending on the submodel) and features the 32-bit Micro Channel architecture (MCA) bus; the Model 70 486, released in December 1989, features the Intel 486 clocked at 25 MHz and also includes the 32-bit MCA bus. The latter is essentially a Model 70 386 with the 486/25 Power Platform pre-installed; this was a CPU upgrade card for the Model 70 386 released earlier in October 1989 that was the first commercially available product to use the 486 processor. Both editions of Model 70 are housed in the same case as the earlier PS/2 Model 50 from 1987.

Development and release

The PS/2 Model 70 borrows the chassis of the PS/2 Model 50 and features the same tool-less construction.
The 25-MHz Intel 386 processor complex from a Model 70 386-A21. This complex also has a 80387 floating point unit installed.

Both variants of the Model 70, along with the rest of the PS/2 line, were developed at IBM's facility in Boca Raton, Florida.[1][2] The chief engineer behind the Model 70 386 was Mark Dean, who previously headed development of the PS/2 Model 80, the PC AT and the ISA bus.[3] The original Personal System/2 Model 70 386 was in development at IBM since 1986, along with the rest of the initial line-up of the PS/2.[4] The existence of prototypes of the Model 70 386 were known to select members of the press and industry insiders since April 1987, but it took until May 1988 for IBM to formally announce it.[5] In the interim, IBM released the PS/2 Model 80—the company's first Intel-based PC with the 32-bit 386 microprocessor. With its tower construction allowing for a greater number of Micro Channel expansion slots and drive bays IBM initially positioned the PS/2 Model 80 as a multiuser workstation. However, the company pivoted the machine toward server use the next year, with the Model 70 386 slotting into the role of a 32-bit workstation.[6]

Both the Model 70 386 and the Model 70 486 feature the same case and tool-less construction as the Model 50 released earlier in April 1987.[7][8] The Model 70 386 was initially manufactured at IBM's facility in Boca Raton, Florida, along with the Model 50, the Model 30, the Model 60, and the Model 80.[1][9] In early 1989, IBM moved manufacturing of PS/2s from Boca Raton to Raleigh, North Carolina, after having shut down their production lines reserved for computer systems in Florida to make way for other products.[9]: 1  The hard drives used in the Model 70s were manufactured at IBM Japan's plant in Fujisawa, Kanagawa.[10]

The Model 70 386 was plagued with several design defects from the time of its release. The Model 70 386-A21 in particular was problematic, with initial production runs possessing a defective processor complex slot that prevented the systems from functioning. These issues and more prompted suspension of production as well as numerous motherboard redesigns lasting two months in early 1989.[11]: 1  In June 1989, IBM issued a recall of certain submodels of the Model 70 386 possessing 120-MB hard drives, after users reported drive failurs and a "10483" error code shortly after purchase. These failures were traced back to a manufacturing error at IBM Fujisawa; the fault was discovered to be oil lubricant breaching containment and leaking outside of the drives.[10] While this leak was easily fixed and did not result in any data loss, it resulted in the recall of 25,000 units of the Model 70 386 that month.[10][12]: 1 

In June 1989, IBM announced the 486/25 Power Platform.[13] This was an upgrade package for the Model 70 386-A21 (see § Specifications for more details on the submodel) comprising a 25-MHz Intel 486 microprocessor on a CPU daughtercard (called a complex, in IBM parlance). This card plugs into a dedicated slot on the motherboard (a planar, in IBM parlance), replacing the 25-MHz 386 processor complex that the Model 70 386-A21 originally shipped with.[13][14] This allows the Model 70 386 to run twice as fast as 386 machines clocked at 33 MHz, on top of giving the Model 70 386 the built-in floating point unit inherent to the i486. The 486/25 Power Platform was the first commercially available product to use the 486 processor, announced just two months after Intel publicly released the 486 processor and first shipping in late September 1989.[13]: 1 [15]: 39  Less than a month later, however, a calculation bug was discovered in early batches of the 486 processor.[16] While the bug was relatively minor and rarely encountered in real-world applications, IBM halted further shipments of the 486/25 Power Platform until December 1989, after Intel had corrected the bug in further batches of 486 processors.[17][18] In the interim, Apricot Computers released the VX FT, the world's first pre-built 486 computer, in early December 1989.[19][20][a] Like the Model 70 386, the VX FT featured the Micro Channel architecture.[21]

In late December 1989, IBM introduced the PS/2 Model 70 486, their first prebuilt computer system with the 486 processor.[18] In essence, the Model 70 486 is identical to the Model 70 386, only with the 486/25 Power Platform preinstalled and with a different badge on the front of the case.[8] Select units of the Model 70 486 were shipped to enterprises in the third week of December 1989, while volume shipment was slated for mid-January 1990.[22]

Specifications

All submodels of Model 70 have three Micro Channel expansion slots: two 32-bit slots and one 16-bit slot.[5] The 16-bit slot features an extension for specific MCA graphics adapters such as the 8514/A.[23]: 139 

Model 70 386

The initial two entries in the Model 70 386 line were released in June 1988 and comprise the Model 70 386-E61, with a 386 processor clocked at 16 MHz, and the Model 70-121, with the same processor clocked at 20 MHz. The Model 70 386-E61 features 1 MB of RAM stock and a 60-MB ESDI hard disk drive. The Model 70-121 doubles the capacity of both the stock amount of RAM and the hard drive capacity. Both units may have their RAM expanded up to 16 MB total; they additionally sport a socket for a 387 floating point unit.[6] The top-of-the-line Model 70 386-A21 was released later, in December 1988 (delayed a month due to FCC Class B emissions testing.[24][25] IBM designed this submodel with a significantly different motherboard, with the 25-MHz Intel 386 processor residing on a daughtercard that plugs into a dedicated slot on the motherboard. This opposed to having the 386 processor plug into a QFP, as is the case with the initial two entries in the Model 70 386 line. Besides housing the 386 processor, the daughtercard also has a socket for 387 math coprocessor and 64 KB worth of 30-ns SRAM acting as cache, driven by an Intel 82385 cache controller. The Model 70-A21 featured the same 120-MB ESDI hard drive as the Model 70-121.[26]: 112 

In September 1989,[27] IBM introduced two new models of the Model 70 386. The first was the Model 70-061, a 20-MHz 386 unit with a 60-MB hard drive intended as a low-cost version of the Model 70-121; and the second was the Model 70-A61, a cost-reduced version of the Model 70 386-A21 (featuring the same 25-MHz 386 on a complex) with the same 60-MB hard drive.[28] After a two year gap with no new introductions, IBM announced the final four models in the Model 70 386 range in December 1991. These included the Model 70 386-A81, a 25-MHz unit with an 80-MB hard drive; the Model 70 386-A16, another 25-MHz unit with a 160-MB hard drive; the Model 70 386-081, a 20-MHz unit with a 80-MB hard drive; and the Model 70 386-161, another 20-MHz unit with a 160 MB hard drive. All four models came with 4 MB of RAM stock.[29] The PS/2 Model 70 386 was officially withdrawn by IBM in October 1992.[30]

Model 70 486

The Model 70 486 was introduced in December 1989 in two variants: the Model 70 486-B21, with a 120-MB ESDI hard drive, and the Model 70 486-B61, with a 60-MB ESDI hard drive. Both ran the Intel 486 processor at 25 MHz and were essentially rebadged variants of the Model 70-121 and Model 70-061 with the 486/25 Power Platform preinstalled.[22] IBM withdrew the Model 70 486 after less than two years on the market, in June 1991.[31]

Portable model

Main article: IBM PS/2 Model P70
The PS/2 Model P70 was a portable version of the PS/2 Model 70 386.

In May 1989, IBM released the PS/2 Model P70, a portable version of the PS/2 Model 70 386 that weighed 21 pounds (9.5 kg) (the same as the Model 70 386 desktop) and had a carrying handle. It featured a 20-MHz Intel 386 processor, 4 MB of RAM stock, and an flat-panel, amber-tined, monochrome gas plasma display. It was IBM's third attempt at a portable PC in the United States, after the market failures that were the Portable PC and the PC Convertible.[32][33]

Reception

The PS/2 Model 70 386 received positive reviews in the press. InfoWorld's Stephen Satchell rated the Model 70 386-121 a "very good value" and assessed it as being faster than a PS/2 Model 80 with the same 20-MHz chip, despite the latter having a more complex construction and a considerably higher cost.[34] Personal Computing's Christopher O'Malley found the Model 70 386-A21 the fastest 25-MHz 386 machine compared to competitors from Compaq and Advanced Logic Research but criticized the limited avenues for upgrading the hard drive, on account of the more-proprietary ESDI interface that the PS/2 used.[35]: 107  Multiple reviewers for InfoWorld rated the Model 70 386-A21 a good value for technical applications (particularly CAD/CAM) but poorly as a file server.[36][37]: 69  Bruce Brown in PC Magazine concluded: "IBM's PS/2 Model 70s combine small size, impressive modular design, and gobs of power in three pricey computers. You can't expand these computers much, but they come fully equipped anyway."[38]

Submodels

See also: List of IBM PS/2 models
IBM PS/2 Model 70 submodels
Model IBM P/N Processor Clock speed
(MHz)		 Bus No. of
slots		 No. of
drive bays		 FDD HDD Stock
RAM		 Maximum
RAM		 Video adapter Monitor Form factor Date introduced Notes Ref(s).
70 386 8570-061 Intel 386 20 MCA, 32-bit 3 3 one 1.44 MB 60 MB (ESDI) 2 MB 6 MB VGA optional Desktop September 1989 [39]
70 386 8570-081 Intel 386 20 MCA, 32-bit 3 3 one 1.44 MB 60 MB (ESDI) 4 MB 6 MB VGA optional Desktop June 1991 [40]
70 386 8570-121 Intel 386 20 MCA, 32-bit 3 3 one 1.44 MB 120 MB (ESDI) 2 MB 6 MB VGA optional Desktop June 1988 [39][6]
70 386 8570-161 Intel 386 20 MCA, 32-bit 3 3 one 1.44 MB 160 MB (ESDI) 4 MB 6 MB VGA optional Desktop June 1991 [39]
70 386 8570-A16 Intel 386 25 MCA, 32-bit 3 3 one 1.44 MB 160 MB (ESDI) 4 MB 6 MB VGA optional Desktop June 1991 [40]
70 386 8570-A21 Intel 386 25 MCA, 32-bit 3 3 one 1.44 MB 120 MB (ESDI) 2 MB 6 MB VGA optional Desktop December 1988 [39][40][6][24][25]
70 386 8570-A61 Intel 386 25 MCA, 32-bit 3 3 one 1.44 MB 60 MB (ESDI) 2 MB 6 MB VGA optional Desktop September 1989 [39][40]
70 386 8570-A81 Intel 386 25 MCA, 32-bit 3 3 one 1.44 MB 80 MB (ESDI) 4 MB 6 MB VGA optional Desktop June 1991 [40]
70 386 8570-E61 Intel 386 16 MCA, 32-bit 3 3 one 1.44 MB 60 MB (ESDI) 1 MB 6 MB VGA optional Desktop June 1988 [39][6]
70 486 8570-B21 Intel 486 25 MCA, 32-bit 3 3 one 1.44 MB 120 MB (ESDI) 2 MB 8 MB VGA optional Desktop December 1989 [41][40][22]
70 486 8570-B61 Intel 486 25 MCA, 32-bit 3 3 one 1.44 MB 60 MB (ESDI) 2 MB 8 MB VGA optional Desktop December 1989 [41][40][22]

Notes

  1. ^ The first units of the VX FX were shipped to various petrol companies in the first week of December 1989.[19]

References

  1. ^ a b Lunan, Charles (June 3, 1988). "IBM Adds Seven Units to PC Line". Sun Sentinel: 1D – via ProQuest.
  2. ^ Lunan, Charles (December 20, 1989). "IBM Model Latest Entry in PC Race". Sun Sentinel: 1D – via ProQuest.
  3. ^ Crothers, Brooke (August 10, 2011). "IBM executive says PC era is in its twilight". CNET. CBS Interactive. Archived from the original on June 1, 2023.
  4. ^ Forbes, Jim; Stephen Kanzler (April 28, 1987). "IBM to fill gap in PS/2 family with '386-based Model 70". PC Week. 4 (17). April 28, 1987: 1 et seq – via Gale.
  5. ^ a b Forbes, Jim; Linda Bridges (May 24, 1988). "IBM will enter desktop derby with triple-crown PS/2 line". PC Week. 5 (21). Ziff-Davis: 1 et seq – via Gale.
  6. ^ a b c d e Chartock, David S. (June 6, 1988). "You asked for them; IBM adds 2 PS/2 models". Computer & Software News. 6 (23). Lebhar-Friedman: 1 et seq – via Gale.
  7. ^ Byers, T. J. (1989). IBM PS/2: A Reference Guide. Intertext Publications. p. 4. ISBN 9780070095250 – via Google Books.
  8. ^ a b Markoff, John (December 20, 1989). "I.B.M. to Base a Computer On Powerful i486 Intel Chip". The New York Times: D8 – via ProQuest.
  9. ^ a b LaPlante, Alice (April 24, 1989). "Dealers Report Model 80 Shortage". InfoWorld. 11 (17). IDG Publications: 1, 93 – via Google Books.
  10. ^ a b c Staff writer (June 13, 1989). "IBM to Replace Model 70 Drives Due to Oil Leaks". The Wall Street Journal. Dow Jones & Company: 1 – via ProQuest.
  11. ^ LaPlante, Alice (March 13, 1989). "Design Flaws Plague Model 70-A21". InfoWorld. 11 (11). IDG Publications: 1, 89 – via Google Books.
  12. ^ LaPlante, Alice (June 12, 1989). "IBM Reports Model 70 Disk Drive Problems". InfoWorld. 11 (24). IDG Publications: 1, 105 – via Google Books.
  13. ^ a b c LaPlante, Alice (June 26, 1989). "IBM Shows Its First 486, Claims Speed Records". InfoWorld. 11 (26). IDG Publications: 1, 8 – via Google Books.
  14. ^ Kvitka, Andre; Daniel Sommer (November 13, 1989). "IBM's 486 Offers Sparkling Performance". InfoWorld. 11 (46). IDG Publications: 141 – via Google Books.
  15. ^ Keefe, Patricia (October 9, 1989). "IBM 80486 upgrade leads the pack". Computerworld. XXIII (41). IDG Publications: 39, 50 – via Google Books.
  16. ^ Yoder, Stephen Kreider (October 27, 1989). "Chip by Intel Contains Flaw in Calculating". The Wall Street Journal. Dow Jones & Company: 1 – via ProQuest.
  17. ^ March, Richard (October 30, 1989). "Bug could delay 486 PCs". PC Week. 6 (43). Ziff-Davis: 8 – via Gale.
  18. ^ a b Rudd, David C. (December 20, 1989). "IBM unveils PS/2 based on i486 chip". Chicago Tribune: 3 – via ProQuest.
  19. ^ a b Staff writer (December 5, 1989). "Minigrams". Computergram International. GlobalData: CGI12050016 – via Gale.
  20. ^ Lavin, Paul (April 28, 1994). "Down, but not out". Computer Weekly. TechTarget: 42 – via Gale.
  21. ^ Lavin, Paul (April 25, 1990). "Racing to the top". PC User. EMAP Media: 131 – via Gale.
  22. ^ a b c d Sexton, Tara (December 25, 1989). "IBM Model 70 486 enters race as the fastest PS/2—so far". PC Week. 6 (51). Ziff-Davis: 1 et seq – via Gale.
  23. ^ Poor, Alfred (February 14, 1989). "25-MHz 386s: Fast, Expensive, and Worth It". PC Magazine. 8 (3). Ziff-Davis: 94–153 – via Google Books.
  24. ^ a b Brennan, Laura; Doug Chandler (November 14, 1988). "High-end PS/2 Model 70 delayed while IBM awaits FCC approval". PC Week. 5 (46). Ziff-Davis: 4 – via Gale.
  25. ^ a b Spiegelman, Lisa L. (December 12, 1988). "First wave of 25MHz '386s sweeps market". PC Week. 5 (50). Ziff-Davis: 57 et seq – via Gale.
  26. ^ Miller, Catherine D. (November 15, 1988). "IBM PS/2 Model 70-E61 (16 MHz); IBM PS/2 Model 70-121 (20 MHz); IBM PS/2 Model 70-A21 (25 MHz)". PC Magazine. 7 (19). Ziff-Davis: 110–117 – via Google Books.
  27. ^ Staff writer (September 27, 1989). "IBM touts Micro Channel features, tweaks PS/2s". Computergram International. GlobalData: CGI09270003 – via Gale.
  28. ^ Sexton, Tara (October 9, 1989). "IBM shaves PS/2 prices, adds disk, RAM options". PC Week. 6 (40). Ziff-Davis: 17 – via Gale.
  29. ^ Staff writer (June 17, 1991). "New PS/2 386SX models: feature faster performance, greater flexibility at lower prices". EDGE. 2 (56). EDGE Publishing: 6 – via Gale.
  30. ^ Staff writer (October 1992). "Minigrams". Computergram International. GlobalData: CGI10290024 – via Gale.
  31. ^ Staff writer (June 17, 1991). "IBM Personal System/2: major announcement highlights". EDGE. 2 (56). EDGE Publishing: 4 – via Gale.
  32. ^ Scannell, Ed (May 15, 1989). "IBM Takes Wraps Off Its Model 70 'To Go'". InfoWorld. 11 (20). IDG Publications: 1, 101 – via Google Books.
  33. ^ Kvitka, Andre (July 24, 1989). "IBM's Third Try at Portable Puts Handle on the Model 70". InfoWorld. 11 (30). IDG Publications: 76–77 – via Google Books.
  34. ^ Satchell, Stephen (August 1, 1988). "IBM PS/2 Model 70-121: Powerful Small-Footprint System Outpaces Model 80". InfoWorld. 10 (31). IDG Publications: 56–57 – via Google Books.
  35. ^ O'Malley, Christopher (September 1988). "IBM's Model 70-A21: The Desktop Rocket". Personal Computing. 12 (9). VNU Business Information Services: 103–109 – via ProQuest.
  36. ^ Capen, Tracey (November 14, 1988). "Hot Rods". InfoWorld. IDG Publications: 71–88 – via Google Books.
  37. ^ Furger, Roberta (August 8, 1988). "PS/2 Model 70-A21: IBM 386 Burns Rubber at 25 MHz". InfoWorld. 10 (32). IDG Publications: 69–70 – via Google Books.
  38. ^ Brown, Bruce (May 30, 1989). "IBM Corp.: IBM PS/2 Model 70-E61; IBM PS/2 Model 70-121; IBM PS/2 Model 70-A21". PC Magazine. 8 (10). Ziff-Davis: 212–220 – via Google Books.
  39. ^ a b c d e f "IBM PS/2 (Model 70-Axx) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  40. ^ a b c d e f g Mueller, Scott (1994). Upgrading and Repairing PCs (4th ed.). Que. pp. 1126–1127. ISBN 9781565299320 – via the Internet Archive.
  41. ^ a b "IBM PS/2 (Model 70 486) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.

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