List of IBM PS/2 models

(Redirected from IBM PS/2 Server)

The Personal System/2 or PS/2 was a line of personal computers developed by International Business Machines Corporation (IBM). Released in 1987, the PS/2 represented IBM's second generation of personal computer following the original IBM PC series, which was retired following IBM's announcement of the PS/2 in April 1987. Most PS/2s featured the Micro Channel architecture bus—a closed standard which was IBM's attempt at recapturing control of the PC market. However some PS/2 models at the low end featured ISA buses, which IBM included with their earlier PCs and which were widely cloned due to being a mostly-open standard. Many models of PS/2 were made, which came in the form of desktops, towers, all-in-ones, portables, laptops and notebooks.

An assortment of IBM PS/2s in various form factors; from left to right: a Server 95, a Model 80, a Model 25, and a PS/2 E on top of a Model 56 and a Model 30 286

Notes

edit
Legend
  ISA, 8-bit
  ISA, 16-bit
  Micro Channel, 16-bit
  Micro Channel, 32-bit
  MCA/ISA
  Other
Explanatory notes
  • Built-in or optional monitors are CRTs unless mentioned otherwise.
  • The Space Saving Keyboard is a 87-key numpad-less version of the Model M.[1]
  • The 25 Collegiate, intended for college students, had two 720 KB floppy drives, maxed out the RAM to 640 KB, and came packaged with the official PS/2 Mouse, Windows 2.0, and four blank floppy disks.[1][2]
  • Financial workstations came packaged with a 50-key function keypad and were intended for use in banks.[1][3]
  • LS models are "LAN Stations": essentially the same as their non-LS counterparts but without floppy drives or hard drives and that connect to networks using Ethernet or Token Ring adapters (in essence, diskless workstations).[4]
  • Ultimedia models shipped with a microphone and included SCSI CD-ROMs, M-Audio sound adapter cards and volume controls and headphone and microphone jacks at the front of the case.[5]
  • Array models are PS/2 Servers with support for RAID.[6]

Models

edit

Main line

edit

PS/2 Server

edit

Portables

edit
edit

See also

edit

References

edit
  1. ^ a b c d e f g h i "IBM Personal System/2 and IBM Personal Computer Product Reference, Version 4.0" (PDF). International Business Machines Corporation. September 1988. p. 44. Retrieved September 29, 2021 – via Bitsavers.
  2. ^ "Short Looks: IBM PS/2 Model 25". InfoWorld. 9 (33). CW Communications. August 17, 1987 – via Google Books.
  3. ^ Gibson, Stanley (November 9, 1987). "IBM banks on options for PS/2s". Computerworld. XXI (45). CW Communications: 24 – via Google Books.
  4. ^ Mardesich, Jodi (October 15, 1990). "IBM Joins Diskless Workstation Market with 386SX Machine". InfoWorld. 12 (42). CW Communications: 39 – via Google Books.
  5. ^ a b c d e f g "IBM PS/2 (Model 77) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  6. ^ a b c d e f g h i j k l Burns, Christine (September 20, 1993). "IBM Offers 7 New Servers". Network World. 10 (38). IDG Publications: 24, 27 – via Google Books.
  7. ^ a b "IBM PS/2 (Model 25) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  8. ^ a b c d "IBM Personal System/2 and IBM Personal Computer Product Reference, Version 4.0" (PDF). International Business Machines Corporation. September 1988. p. 43. Retrieved September 29, 2021 – via Bitsavers.
  9. ^ a b c "IBM PS/2 (Model 25-286) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  10. ^ a b c 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. The new models will become available in April at $1,249 to $1,899, IBM said.
  11. ^ a b c Walsh, William (June 15, 2005). "IBM PS/2 Model 25SX". Walsh Computer Technology. Retrieved September 29, 2021.
  12. ^ Mueller, Scott (1994). Upgrading and Repairing PCs (4th ed.). Que. pp. 1120–1121. ISBN 9781565299320 – via the Internet Archive.
  13. ^ "IBM cuts prices on three PS/2s". Computer & Software News. 7 (15). Lebhar-Friedman, Inc.: 3 et seq April 10, 1989 – via Gale.
  14. ^ a b "IBM PS/2 (Model 30) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  15. ^ a b Gibson, Stanley (November 9, 1987). "IBM banks on options for PS/2s". Computerworld. XXI (45). CW Communications: 24 – via Google Books.
  16. ^ a b "IBM PS/2 (Model 30-286) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  17. ^ "IBM Personal System/2 Model 30 286 (8530-E31)". International Business Machines Corporation. September 26, 1989. Retrieved September 29, 2021.
  18. ^ "IBM Personal System/2 Model 30 286 (8530-E41)". International Business Machines Corporation. April 23, 1991. Retrieved September 29, 2021.
  19. ^ a b c d "IBM PS/2 (Model 35 SX/35 LS) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  20. ^ "IBM Sales Manual (US) – Document 5765-160: IBM AIX PS/2 Operating System v1.3". International Business Machines Corporation. September 21, 1992. Archived from the original on November 5, 2022.
  21. ^ a b "IBM PS/2 (Model 35 SLC) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  22. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af "List of IBM Vintage PCs". Mastodonic Personal Computers. July 29, 2002. Archived from the original on September 29, 2023.
  23. ^ Buckler, Grant (August 5, 1992). "IBM Canada cuts PS/2 prices". Newsbytes. The Washington Post Company – via Gale.
  24. ^ a b c "IBM PS/2 (Model 40 SX) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  25. ^ a b "IBM PS/2 (Model 40 SLC) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  26. ^ "IBM PS/2 (Model 50) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  27. ^ a b c d e f g Bowlds, Pat A. (1991). Micro Channel Architecture: Revolution in Personal Computing. Van Nostrand Reinhold. pp. 338–339. ISBN 9780442004330 – via Google Books.
  28. ^ a b "IBM PS/2 (Model 50 Z) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  29. ^ a b c d "IBM PS/2 (Model 55 SX/55 LS) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  30. ^ a b Mueller, Scott (1994). Upgrading and Repairing PCs (4th ed.). Que. pp. 1124–1125. ISBN 9781565299320 – via the Internet Archive.
  31. ^ a b Brennan, Laura (October 15, 1990). "By naming, pricing diskless PC, IBM bolsters LAN lineup". PC Week. 7 (41). Ziff-Davis: 10 – via Gale.
  32. ^ a b c d e "IBM PS/2 (Model 56 SX/56 LS) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  33. ^ a b "IBM intros its fastest 386SX systems to keep PS/2 ahead of the pack". EDGE. 3 (93). EDGE Publishing: 44. March 2, 1992 – via Gale.
  34. ^ a b c d "IBM PS/2 (Model 56 SLC/56 SLC LS) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  35. ^ a b "IBM PS/2 (Model 57 SX) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  36. ^ a b c "IBM PS/2 (Model 57 SLC) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  37. ^ a b c d e f g h i j Mueller, Scott (1994). Upgrading and Repairing PCs (4th ed.). Que. pp. 1126–1127. ISBN 9781565299320 – via the Internet Archive.
  38. ^ a b "IBM PS/2 (Model 60) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  39. ^ a b c d e f Halliday, Caroline M.; James A. Shields (1988). IBM PS/2: Technical Guide. Howard W. Sams. p. 26. ISBN 9780672226281 – via Google Books.
  40. ^ a b c d e f Scannell, Ed; Alice LaPlante (March 26, 1990). "IBM Unveils New PS/2s with Fast SCSI Storage". InfoWorld. 12 (13). IDG Publications: 1, 8 – via Google Books.
  41. ^ a b "IBM PS/2 (Model 65 SX) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  42. ^ Woods, Wendy (October 30, 1990). "IBM rolls out high-end PS/2s, low-memory OS/2 version". Newsbytes. The Washington Post Company – via Gale.
  43. ^ 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.
  44. ^ a b c 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.
  45. ^ 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.
  46. ^ Spiegelman, Lisa L. (December 12, 1988). "First wave of 25MHz '386s sweeps market". PC Week. 5 (50). Ziff-Davis: 57 et seq – via Gale.
  47. ^ a b "IBM PS/2 (Model 70 486) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  48. ^ a b 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.
  49. ^ a b c "IBM PS/2 (Model 80) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  50. ^ a b c LaPlante, Alice (August 10, 1987). "New Model 80 Offers 314MB Disk". InfoWorld. 9 (32). IDB Publications: 1, 89 – via Google Books.
  51. ^ a b Pitta, Julie (February 8, 1988). "Deskpro powers up". Computerworld. XXII (6). IDG Publications: 33, 36 – via Google Books.
  52. ^ a b c "IBM Personal System/2 Model 80 (8580-081, 161 and A16) Announcement Letter". International Business Machines Corporation. October 30, 1990. Archived from the original on September 29, 2021. Retrieved September 29, 2021.
  53. ^ Pappas, Kim (November 3, 1987). "IBM ships 115M-byte version of PS/2 Model 80". PC Week. 4 (44). Ziff-Davis: 4 – via Gale.
  54. ^ a b c Mueller, Scott (1994). Upgrading and Repairing PCs (4th ed.). Que. pp. 1128–1129. ISBN 9781565299320 – via the Internet Archive.
  55. ^ Feil, Stuart (October 5, 1987). "Compaq adds new '386 PC arch". Electronic News. 33. Sage Publications: 15 et seq – via Gale.
  56. ^ a b c d "IBM PS/2 53 486SLC2 (9553-0B7 and 0BB), IBM PS/2 53LS 486SLC2 (9553-1BX and 2BX) Announcement Letter". International Business Machines Corporation. Archived from the original on September 11, 2014. Retrieved September 28, 2021 – via Kevin Bowling.
  57. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap Personal Systems Reference – IBM PS/2 1992 to 1995 – withdrawn (PDF). International Business Machines Corporation. May 1995.
  58. ^ a b "New PCs: new IBM PS/2s". EDGE. 3 (123). EDGE Publishing: 11. September 28, 1992 – via Gale.
  59. ^ a b "IBM PS/2 (Model 56 SLC2) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  60. ^ a b c d e f g Mueller, Scott (1994). Upgrading and Repairing PCs (4th ed.). Que. pp. 1208–1209. ISBN 9781565299320 – via the Internet Archive.
  61. ^ a b c d e Hoskins, Jim (1994). IBM Personal Systems. Wiley. p. 10. ISBN 9780471599302 – via the Internet Archive.
  62. ^ a b "9556 / 9557 Planar: SLC2, SLC3 & Ultimedia M57 SLC2". Ardent Tool. n.d. Archived from the original on June 9, 2023.
  63. ^ a b "IBM PS/2 56 and 57 486SLC2, PS/2 Ultimedia M57 and Ultimedia DV M57 486SLC2 Announcement Letter". International Business Machines Corporation. September 21, 1992. Archived from the original on September 28, 2021. Retrieved September 28, 2021.
  64. ^ a b "IBM PS/2 (Model 57 SLC2) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  65. ^ a b c d e f "IBM Hardware Export Classification Lookup Tool – Search Results – 466201–466250 of 468,275 results". International Business Machines Corporation. September 7, 2016. Archived from the original on October 21, 2023.
  66. ^ a b "IBM PS/2 (Model 76) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  67. ^ a b c d e f g "IBM PS/2 (Model 90 XP 486) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  68. ^ a b "IBM asks users to pay arm and a leg for new PS/2s". Computergram International. GlobalData. April 29, 1992 – via Gale.
  69. ^ a b c d e f "IBM PS/2 (Enhanced Model 90 XP 486) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  70. ^ a b c d e f g h i j "IBM PS/2 (Model 95 XP 486) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  71. ^ a b c d e f g h i "IBM PS/2 (Model 95 XP 486) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  72. ^ a b c d e f g h i j k l m n o "IBM PS/2 (Enhanced Model 95 XP 486)/PC Server 95 – Technical Specifications". International Business Machines Corporation. Archived from the original on September 12, 2014. Retrieved September 28, 2021 – via Kevin Bowling.
  73. ^ a b c d e f g "PS/2 Server 85 – Technical Specifications (9585-0X6, 0X9, 0XA, 0XD, 0XF, 0XG, 0XT)". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  74. ^ a b c d e f g Scannell, Ed (September 28, 1992). "Big Blue Relaunches PS/2s and Slashes Prices". InfoWorld. CW Communications. p. 12 – via Google Books.
  75. ^ a b "PS/2 Server 85 – Technical Specifications (9585-0KG, 0KT)". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  76. ^ a b c d e f g h i j k l m n Gillooly, Caryn (October 5, 1992). "IBM Fills Out Server Plan with Two New PS/2 Models". Network World. 9 (40). IDG Publications: 11 – via Google Books.
  77. ^ a b c d "IBM PS/2 (Server 85)/PC Server 85 – Technical Specifications". International Business Machines Corporation. January 13, 1999. Retrieved September 28, 2021 – via Kevin Bowling.
  78. ^ a b "PS/2 Server 85 – Technical Specifications (9585-0NG, 0NT)". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  79. ^ a b c d Corcoran, Cate (September 20, 1993). "Faster IBM Servers Due This Month". InfoWorld. CW Communications. p. 25 – via Google Books.
  80. ^ a b c "PS/2 Server 95 – Technical Specifications (8595-0K6, 0K9, 0KA, 0KD, 0KF, 0KG, 0KT)". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  81. ^ a b c d e f "PS/2 Server 95 – Technical Specifications (8595-0LF) – Technical Specifications". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  82. ^ a b c d e f g "PS/2 Server 95 – Technical Specifications (9595-0M6, 0M9, 0MA, 0MD, 0MF, 0MG, 0MT)". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  83. ^ a b "PS/2 Server 95 – Technical Specifications (9595-1NG, 1NT)". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  84. ^ International Business Machines Corporation (April 26, 1994). "IBM Net Select advertisement". PC Magazine. 13 (8). Ziff-Davis: 199.
  85. ^ a b "PS/2 Server 95 – Technical Specifications (9595-0PG, 0PT)". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  86. ^ a b "PS/2 Server 95 – Technical Specifications (9595-0QG, 0QT)". International Business Machines Corporation. 2000. Retrieved September 28, 2021 – via Ardent Tool.
  87. ^ Hoskins, Jim (1995). IBM Personal Computers: A Business Perspective. Wiley. pp. 12, 61. ISBN 9780471047957 – via Google Books.
  88. ^ "Announcement Summary – December 20, 1994". International Business Machines Corporation. December 20, 1994. Archived from the original on October 22, 2023.
  89. ^ a b "IBM PS/2 Server 195 (8600-003 Announcement Letter". Industrial Business Machines. April 6, 1993. Retrieved September 29, 2021 – via Ardent Tool.
  90. ^ a b Staff writers (December 21, 1992). "Product Evaluation: PS/2 Server 295". Computerworld. 26 (51). CW Communications: 31–32 – via Google Books.
  91. ^ a b c Slavotínek, Tomáš. "8600 IDC Boards: Intelligent Disk Controller". Retrieved October 3, 2021.
  92. ^ "IBM PS/2 Server 195 (8600-003 Announcement Letter". Industrial Business Machines. April 6, 1993. Retrieved September 29, 2021 – via Ardent Tool.
  93. ^ a b c d e f IBM Personal System/2 Facts and Features (PDF). Vol. G360-2832-08. International Business Machines Corporation. June 1991.
  94. ^ Brutman, Michael B. (August 16, 2020). "IBM Personal System/2 Laptop 40 SX (PS/2 L40SX) Notes". Brutman.com. Retrieved September 29, 2021.
  95. ^ a b c d e f Fisher, Sharon (February 8, 1988). "Workstation Merges PS/2, RT Technology". InfoWorld. 10 (6). CW Communications: 1, 81 – via Google Books.
  96. ^ a b c d e f IBM 6152 Academic System (PDF). Vol. G590-0200-00. International Business Machines Corporation. 1988.
  97. ^ a b c d e f Walsh, William (2007). "IBM 6152 Academic System". Walsh Computer Technology. Retrieved September 29, 2021.
  98. ^ "IBM 7690 Clinical Workstation". Ardent Tool. 2022. Archived from the original on May 25, 2022.
  99. ^ a b c Greaves, Tom (March 1993). "EduQuest aims high: building the ideal computer for schools". Electronic Learning. 12 (6). Scholastic Inc.: 26 – via Gale OneFile.
  100. ^ a b c Staff writer (March 1993). "EduQuest announces new line of computers for K-12". Electronic Learning. 12 (6). Scholastic Inc.: 25 – via Gale OneFile.
  101. ^ a b c d e f g h "9655001 – IBM EduQuest 14-inch Monitor". DirectMacro. Archived from the original on September 30, 2021. Retrieved September 30, 2021.
  102. ^ a b "Title unknown". THE Journal. Technological Horizons in Education. 1994 – via Google Books.
  103. ^ a b "IBM EduQuest". Ardent Tool. Retrieved September 29, 2021.
  104. ^ a b Shields, Jean (September 1994). "Back-to-school computers". Technology & Learning. 15 (1). Future US: 66 – via Gale OneFile.
  105. ^ Staff writer (September 1995). "What's new on the hardware front". Technology & Learning. 16 (1). Future US: 64 – via Gale OneFile.
  106. ^ "IBM 7496 Executive Workstation". Ardent Tool. 2022. Archived from the original on May 25, 2022.
  107. ^ Reeve, Alan (January 1991). "Integrating PLCs with networks". Control and Instrumentation. 23 (1). Centaur Communications: 35 – via Gale OneFile. GE Fanuc has also introduced the Workmaster II, an i386-based ruggedised PC designed to be used as a portable PLC programmer. Operating at 16 MHz, the unit gives short start-up times, rapid hard disk and memory access and quick system updates.
  108. ^ a b "IBM 7552 Industrial Computer Model 540 Announcement Letter". Industrial Business Machines. November 3, 1987. Retrieved September 29, 2021 – via Ardent Tool.
  109. ^ a b Kono, M. E. (December 1992). Surface Computer System Architecture for the Advanced Unmanned Search System (AUSS) (PDF). Naval Command, Control and Ocean Surveillance Center. p. 3 – via Ardent Tool.
  110. ^ a b Wallace, Bob (October 20, 1986). "IBM uncloaks industrial micro as network gateway". Network World. 3 (33). IDG Publications – via Google Books.
  111. ^ a b Cleaveland, Peter (April 21, 1987). "Low-cost, flexible microcomputers get jobs in factories". Instrumentation & Control Systems. 61 (5). Reed Business Information Enterprise: 31 – via Gale OneFile. IBM doesn't advertise the PS/2 as a factory-floor machine, yet the PS/2's backplane bus structure, Micro Channel, appeared in a factory-floor computer before the PS/2 itself came on the market. People who examined the IBM 7552 Gearbox, ostensibly a factory-hardened version of the AT, notice something odd about the unit's bus: It had more bus lines than could be accounted for by the AT bus. The extra lines turned out to be the 16-bit Micro Channel. Nobody at IBM said anything about it at the time, because PS/2 hadn't yet been introduced.
  112. ^ a b c d LaPlante, Alice (March 27, 1989). "IBM Announces Two Industrial MCA Computers". InfoWorld. 11 (13). CW Communications – via Google Books.
  113. ^ a b c d "IBM 7561 and 7562 Industrial Computers Announcement Letter". International Business Machines Corporation. March 21, 1989. Retrieved September 29, 2021.
  114. ^ "IBM 7546 Industrial Computers Announcement Letter". International Business Machines Corporation. September 4, 1991. Retrieved September 29, 2021.
  115. ^ a b "Gearbox Model 80 Announcement Letter". Industrial Business Machines. October 24, 1989. Retrieved September 29, 2021 – via Ardent Tool.
  116. ^ a b c d Slavotínek, Tomáš. "7568 Common Devices". Ardent Tool. Retrieved September 29, 2021.
  117. ^ "Gearbox Model 80 (7568-C40) Announcement Letter". Industrial Business Machines. September 4, 1991. Retrieved September 29, 2021 – via Ardent Tool.
  118. ^ "Gearbox Model 80 (7568-D40) Announcement Letter". Industrial Business Machines. September 15, 1992. Retrieved September 29, 2021 – via Ardent Tool.
  119. ^ a b c d e f "IBM Personal System/2 and IBM Personal Computer Product Reference, Version 4.0" (PDF). International Business Machines Corporation. September 1988. p. 46. Retrieved September 29, 2021 – via Bitsavers.
  120. ^ a b LaPlante, Alice (July 24, 1989). "IBM Reenters AT Market with Typing System Line". InfoWorld. 11 (30). CW Communications: 9 – via Google Books.
  121. ^ a b "The IBM Personal Printer Series II 2390 and 2391 Impact Printers Announcement Letter". International Business Machines Corporation. August 20, 1991. Retrieved September 29, 2021.