IBM PS/2 Model 25

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IBM Personal System/2 Model 25
Intel 80386SX at 20 MHz (Model 25 SX)
Graphics
(Models 25 286 and 25 SX)
Power120/240 VAC ～

The Personal System/2 Model 25 and its later submodels the 25 286 and 25 SX are

all-in-one form factor, with its cathode-ray tube (CRT) monitor and system board occupying the same enclosure. IBM oriented the Model 25 at home office workers and students.[2]

Development and release

Case badge on a Model 25 SX

IBM unveiled the Model 25 on August 4, 1987. It is the fifth entry of the Personal System/2 range. The first Model 25 is powered by an Intel 8086 running at 8 MHz, roughly twice the speed of the original IBM Personal Computer.[3] A college student-oriented version of the Model 25, the Collegiate, has two 720 KB floppy drives, with a maximum RAM capacity of 640 KB, and was packaged with the official PS/2 Mouse, Windows 2.0, and four blank floppy disks.[4]

In 1990, IBM released the Model 25 286, which upgrades the original to an

Intel 80386SX clocked at 20 MHz. This version of the Model 25 was sold only to K–12 schools.[6] The Model 25 series was never officially sold outside of the United States.[7]

IBM neither included nor supported hard disk drives in the original Model 25, although several aftermarket kits were available by late 1987.[8] The later 25 286 and 25 SX were sold with a hard drive as an option.[7][9]

Reception

Multiple contemporary reviewers compared the Model 25 to Apple's original Macintosh.[2][10][11] Stephen Satchell of InfoWorld wrote when he first saw the Model 25 on its announcement: "[M]y immediate impression was that I was looking at a deformed Macintosh. When the stage lights came up, the illusion was shattered and I saw the similarity to the rest of the PS/2 line."[4]

David E. Sanger of

PC Magazine were frustrated by the Model 25's lack of a built-in hard disk drive.[2][11] Venditto wrote that, on launch, contemporary aftermarket hard drives were too large to be installed in either of the computer's two floppy drive bays—with no announcements for a hard drive solution for the Model 25 on the horizon. He also observed that the space for the top ISA slot on the riser is partially obstructed by the CRT monitor, preventing full-height cards from fitting into that slot. On the whole, he appreciated the sturdily built chassis and concluded that the Model 25 was a "well-crafted, fast computer for places where real estate is at a premium."[11]

Submodels

See also: List of IBM PS/2 models
IBM PS/2 Model 25 submodels
Model IBM P/N Processor Clock speed
(MHz)		 Bus
L2 cache

(KB)		 No. of
slots
 No. of
drive bays		 FDD HDD Stock
memory		 Monitor Form factor Date introduced Notes Ref(s).
25 8525-001 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 one 720 KB none 512 KB 12-in. monochrome All-in-one August 1987 Space Saving Keyboard [12]
25 8525-004 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 one 720 KB none 512 KB 12-in. color All-in-one August 1987 Space Saving Keyboard [12]
25 8525-G01 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 one 720 KB none 512 KB 12-in. monochrome All-in-one August 1987 [13]
25 8525-G04 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 one 720 KB none 512 KB 12-in. color All-in-one August 1987 [13]
25 LS 8525-L01 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 one 720 KB none 512 KB 12-in. monochrome All-in-one August 1987 Token Ring [13]
25 LS 8525-L04 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 one 720 KB none 512 KB 12-in. color All-in-one August 1987 Token Ring [13]
25 Collegiate 8525-C02 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 two 720 KB none 640 KB 12-in. monochrome All-in-one August 1987 Space Saving Keyboard [14]
25 Collegiate 8525-K02 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 two 720 KB none 640 KB 12-in. monochrome All-in-one August 1987 [14]
25 Collegiate 8525-C05 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 two 720 KB none 640 KB 12-in. color All-in-one August 1987 Space Saving Keyboard [14]
25 Collegiate 8525-K05 Intel 8086 8 (0 w) ISA, 8-bit 0 2 2 two 720 KB none 640 KB 12-in. color All-in-one August 1987 [14]
25 286 8525-006 Intel 80286 10 (1 w) ISA, 16-bit 0 2 2 one 1.44 MB none 1 MB 12-in. color All-in-one October 1990 Space Saving Keyboard [15]
25 286 8525-036 Intel 80286 10 (1 w) ISA, 16-bit 0 2 2 one 1.44 MB 30 MB 1 MB 12-in. color All-in-one October 1990 [15]
25 286 8525-G06 Intel 80286 10 (1 w) ISA, 16-bit 0 2 2 one 1.44 MB none 1 MB 12-in. color All-in-one October 1990 Space Saving Keyboard [15]
25 286 8525-G36 Intel 80286 10 (1 w) ISA, 16-bit 0 2 2 one 1.44 MB 30 MB 1 MB 12-in. color All-in-one October 1990
25 SX 8525-K00
Intel 80386SX
 20 ISA, 16-bit 0 3 2 one 1.44 MB 1 MB 12-in. color All-in-one April 1992 [6][9]
25 SX 8525-K01
Intel 80386SX
 20 ISA, 16-bit 0 3 2 one 1.44 MB 1 MB 12-in. color All-in-one April 1992 Ethernet [6][9]
25 SX 8525-L02
Intel 80386SX
 20 ISA, 16-bit 0 3 2 one 1.44 MB 1 MB 12-in. color All-in-one April 1992 Token Ring [6][9]

References

  1. ISBN 9780673381712
    – via Google Books.
  2. ^ a b c d Sanger, David E. (August 9, 1987). "I.B.M. Learns from the Macintosh". The New York Times: A12 – via ProQuest.
  3. ^ Hillkirk, John; Mark Lewyn (August 4, 1987). "Tandy, IBM target school, home market". USA Today. Gannett Company: 1B – via ProQuest.
  4. ^ a b Satchell, Stephen (August 17, 1987). "Short Looks: IBM PS/2 Model 25". InfoWorld. 9 (33). IDG Publications: 44 – via Google Books.
  5. ^ Marburg, Robert (December 24, 1990). "IBM debates AT-bus PS/2 plans for '91". PC Week. 7 (51). Ziff-Davis: 6 – via Gale.
  6. ^ a b c d Lunan, Charles (January 1992). "IBM Goes After School Computer Market". Sun Sentinel. Tribune Publishing Company. p. D3 – via ProQuest. On Tuesday, IBM released the first product developed by [Jose] Garcia's team: the Model 25 SX. The new model uses the same Intel 386SX microprocessor ... to run the graphics-rich software popular with teachers. It will be able to display up to 256 different colors and come standard with connections for overhead projection systems and computer networks. IBM said the new models would become available in April at $1,249 to $1,899.
  7. ^ a b Staff writer (May 11, 1990). "IBM adds pricey 80286-based PS/2 model 25 in US". Computergram International (1423). GlobalData – via Gale.
  8. ^ Willmott, Donald P. (December 8, 1987). "Hard Disk Power for the Model 25". PC Magazine. 6 (21). Ziff-Davis: 328 – via Google Books.
  9. ^ a b c d Walsh, William (June 15, 2005). "IBM PS/2 Model 25SX". Walsh Computer Technology. Retrieved September 29, 2021.
  10. ^ Freiberger, Paul; John Markoff (October 13, 1987). "Apple's Mac emerges as most influential PC". Montreal Gazette: G1 – via ProQuest.
  11. ^ a b c Venditto, Gus (September 29, 1987). "PS/2 Model 25 Looks Like a Mac, Runs Like a Model 30". PC Magazine. 6 (16). Ziff-Davis: 33–34 – via Google Books.
  12. ^ a b "IBM PS/2 (Model 25) – Technical Specifications". International Business Machines. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  13. ^ a b c d "IBM Personal System/2 and IBM Personal Computer Product Reference, Version 4.0" (PDF). International Business Machines. September 1988. p. 44. Retrieved September 29, 2021 – via Bitsavers.
  14. ^ a b c d "IBM Personal System/2 and IBM Personal Computer Product Reference, Version 4.0" (PDF). International Business Machines. September 1988. p. 43. Retrieved September 29, 2021 – via Bitsavers.
  15. ^ a b c "IBM PS/2 (Model 25-286) – Technical Specifications". International Business Machines. 2000. Retrieved September 28, 2021 – via Ardent Tool.
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