List of IBM Personal Computer models explained

The IBM Personal Computer, commonly known as the IBM PC, spanned multiple models in its first generation (including the PCjr, the Portable PC, the XT, the AT, the Convertible, and the /370 systems, among others), from 1981 to 1987. It eventually gave way to many splintering product lines after IBM introduced the Personal System/2 in April 1987.

Notes

Legend

Models

Original line

+ IBM Personal Computer models	Type	IBM	Date announced	Date withdrawn	Bus	of slots	of bays	Processor	Clock speed	Stock onboard RAM	Maximum onboard RAM			Notes	Ref(s).
Personal Computer	5150-001			ISA, 8-bit	5	2	Intel 8088	4.77	16 KB	64 KB	none	none	Diskless model; only means of data storage is through IBM Cassette BASIC	[1] [2] [3]
Personal Computer	5150-003			ISA, 8-bit	5	2	Intel 8088	4.77	48 KB	64 KB	160 KB	none	Single-sided, double-density floppy disk drive	[4]
Personal Computer	5150-013			ISA, 8-bit	5	2	Intel 8088	4.77
Personal Computer	5150-014			ISA, 8-bit	5	2	Intel 8088	4.77	16 KB	64 KB	160 KB	none		[5] [6]
Personal Computer	5150-064			ISA, 8-bit	5	2	Intel 8088	4.77	16 KB	64 KB	320 KB	none
Personal Computer	5150-074			ISA, 8-bit	5	2	Intel 8088	4.77	16 KB	64 KB	two 320 KB	none
Personal Computer	5150-X14			ISA, 8-bit	5	2	Intel 8088	4.77	16 KB	64 KB	160 KB	none	Shipped without keyboard; includes adapter for integration with IBM 3278 terminal systems	[7]
Personal Computer	5150-X64			ISA, 8-bit	5	2	Intel 8088	4.77	16 KB	64 KB	320 KB	none	Shipped without keyboard; includes adapter for integration with IBM 3278 terminal systems
Personal Computer	5150-X74			ISA, 8-bit	5	2	Intel 8088	4.77	16 KB	64 KB	two 320 KB	none	Shipped without keyboard; includes adapter for integration with IBM 3278 terminal systems
Personal Computer	5150-114			ISA, 8-bit	5	2	Intel 8088	4.77	64 KB	256 KB	160 KB	none
Personal Computer	5150-164			ISA, 8-bit	5	2	Intel 8088	4.77	64 KB	256 KB	320 KB	none
Personal Computer	5150-174			ISA, 8-bit	5	2	Intel 8088	4.77	64 KB	256 KB	two 320 KB	none
Personal Computer	5150-104			ISA, 8-bit	5	2	Intel 8088	4.77	64 KB	256 KB	none	none	Diskless model; only means of data storage is through IBM Cassette BASIC	[8] [9]
Personal Computer	5150-166			ISA, 8-bit	5	2	Intel 8088	4.77	256 KB	256 KB	360 KB	none
Personal Computer	5150-176			ISA, 8-bit	5	2	Intel 8088	4.77	256 KB	256 KB	two 360 KB	none		[10] [11]
Personal Computer	5150-X66			ISA, 8-bit	5	2	Intel 8088	4.77	256 KB	256 KB	360 KB	none	Shipped without keyboard	[12]
Personal Computer	5150-X76			ISA, 8-bit	5	2	Intel 8088	4.77	256 KB	256 KB	two 360 KB	none	Shipped without keyboard
Personal Computer XT	5160-087			ISA, 8-bit	8	2	Intel 8088	4.77	128 KB	640 KB	360 KB	10 MB		[13]
Personal Computer XT	5160-086			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	360 KB	10 MB		[14]
Personal Computer XT	5160-068			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	360 KB	none		[15]
Personal Computer XT	5160-078			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	two 360 KB	none
Personal Computer XT	5160-088			ISA, 8-bit	8	2	Intel 8088	4.77	512 KB	640 KB	360 KB	20 MB	Shipped with original IBM PC "Model F" keyboard	[16]
Personal Computer XT	5160-089			ISA, 8-bit	8	2	Intel 8088	4.77	512 KB	640 KB	360 KB	20 MB	Shipped with Enhanced Keyboard
Personal Computer XT	5160-267			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	360 KB	none	Shipped with original IBM PC "Model F" keyboard
Personal Computer XT	5160-268			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	360 KB	none	Shipped with Enhanced Keyboard
Personal Computer XT	5160-277			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	two 360 KB	none	Shipped with original IBM PC "Model F" keyboard
Personal Computer XT	5160-278			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	two 360 KB	none	Shipped with Enhanced Keyboard
3270 PC	5271-000			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	360 KB	none	Without printer adapter, fixed disk adapter, and keyboard	[17] [18]
3270 PC	5271-002			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	360 KB	none	Without printer adapter and fixed disk adapter	[19]
3270 PC	5271-004			ISA, 8-bit	8	2	Intel 8088	4.77	320 KB	640 KB	360 KB	none	Without fixed disk adapter; stock onboard RAM increased to 384 KB in June 1984
3270 PC	5271-006			ISA, 8-bit	8	2	Intel 8088	4.77	320 KB	640 KB	360 KB	10 MB	With fixed disk adapter; stock onboard RAM increased to 384 KB in June 1984
Personal Computer XT/370	5160-568			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	360 KB	none		[20]
Personal Computer XT/370	5160-588			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	360 KB	10 MB
Personal Computer XT/370	5160-589			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	640 KB	360 KB	10 MB
PCjr	4860-004			Custom	N/A	N/A	Intel 8088	4.77	64 KB	128 KB	none	none		[21] [22]
PCjr	4860-067			Custom	N/A	N/A	Intel 8088	4.77	128 KB	128 KB	360 KB	none
Portable Personal Computer	5155-068			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	512 KB	360 KB	none
Portable Personal Computer	5155-076			ISA, 8-bit	8	2	Intel 8088	4.77	256 KB	512 KB	two 360 KB	none		[23]
Personal Computer AT	5170-068			ISA, 16-bit	8	3	Intel 80286	6	256 KB	512 KB	1.2 MB	none		[24] [25]
Personal Computer AT	5170-099			ISA, 16-bit	8	3	Intel 80286	6	512 KB	512 KB	1.2 MB	20 MB
Personal Computer AT	5170-239			ISA, 16-bit	8	3	Intel 80286	6	512 KB	512 KB	1.2 MB	30 MB		[26] [27]
Personal Computer AT	5170-839			ISA, 16-bit	8	3	Intel 80286	6	512 KB	512 KB	1.2 MB	two 30 MB	Includes controllers for the IBM 4680 Store System	[28]
Personal Computer AT	5170-899			ISA, 16-bit	8	3	Intel 80286	6	512 KB	512 KB	1.2 MB	two 20 MB	Includes controllers for the IBM 4680 Store System
Personal Computer AT	5170-319			ISA, 16-bit	8	3	Intel 80286	8	512 KB	512 KB	1.2 MB	30 MB		[29]
Personal Computer AT	5170-339			ISA, 16-bit	8	3	Intel 80286	8	512 KB	512 KB	1.2 MB	30 MB	Shipped with Enhanced Keyboard
Personal Computer AT	5171-168			ISA, 16-bit	8	3	Intel 80286	8	512 KB	512 KB	1.2 MB	none	Built to TEMPEST specifications
Personal Computer AT	5171-339			ISA, 16-bit	8	3	Intel 80286	8	512 KB	512 KB	1.2 MB	30 MB	Built to TEMPEST specifications
Personal Computer AT/370	5170-599			ISA, 16-bit	8	3	Intel 80286	6	512 KB	512 KB	1.2 MB	20 MB
Personal Computer AT/370	5170-739			ISA, 16-bit	8	3	Intel 80286	6	512 KB	512 KB	1.2 MB	30 MB		[30] [31]
Personal Computer AT/370	5170-919			ISA, 16-bit	8	3	Intel 80286	6	512 KB	512 KB	1.2 MB	30 MB	1 MB total RAM (peripheral)	[32]
Personal Computer AT/370	5170-939			ISA, 16-bit	8	3	Intel 80286	6	512 KB	512 KB	1.2 MB	30 MB	1 MB total RAM (peripheral); shipped with Enhanced Keyboard	[33]
PC Convertible	5140-002			ISA, 8-bit (proprietary)	N/A	N/A	Intel 8088	4.77	256 KB	512 KB	two 720K	none	Application bundle
PC Convertible	5140-022			ISA, 8-bit (proprietary)	N/A	N/A	Intel 8088	4.77	256 KB	512 KB	two 720K	none
Personal Computer XT Model 286	5162-286			ISA, 16-bit	8	2	Intel 80286	6	640 KB	640 KB	1.2 MB	20 MB		[34]
Industrial Computer 5531	5531-001			ISA, 8-bit	8	3	Intel 8088	4.77	128 KB	640 KB	360 KB	10 MB	Industrial version of the IBM PC XT	[35] [36]
Industrial Computer 5531	5531-011			ISA, 8-bit	8	3	Intel 8088	4.77	256 KB	640 KB	1.2 MB	none	Industrial version of the IBM PC XT	[37]
Industrial Computer 5531	5531-021			ISA, 8-bit	8	3	Intel 8088	4.77	256 KB	640 KB	1.2 MB	20 MB	Industrial version of the IBM PC XT
7531 Industrial Computer	7531-041			ISA, 16-bit	8	3	Intel 80286	6	512 KB	1 MB			Industrial version of the IBM PC AT, tower form-factor
7532 Industrial Computer	7532-041			ISA, 16-bit	8	3	Intel 80286	6	512 KB	1 MB			Industrial version of the IBM PC AT, 19-inch rack-mountable form factor
Industrial Computer 7552	7552-040			ISA, 16-bit MCA, 16-bit	8	3	Intel 80286	10	4 MB		none	none	Also known as "Gearbox", rack-mountable ruggedized modular industrial computer, hybrid MCA and ISA with compromised ISA signal lines—notable for introducing the (16-bit) Micro Channel architecture half a year before the announcement of the PS/2 line in April 1987	[38] [39] [40] [41]
Industrial Computer 7552	7552-140			ISA, 16-bit MCA, 16-bit	8	3	Intel 80286	10	4 MB		one 1.44 MB	20 MB	Also known as "Gearbox", rack-mountable ruggedized modular industrial computer, hybrid MCA and ISA with compromised ISA signal lines—notable for introducing the (16-bit) Micro Channel architecture half a year before the announcement of the PS/2 line in April 1987

Successor lines

• Personal System/2 (list of models)
• Industrial System (list of models)
• PCradio (list of models)
• Ambra (list of models)
• PS/note (list of models)
• EduQuest (list of models)
• ThinkPad
• PS/ValuePoint (list of models)
• Aptiva (list of models)
• PC Series (list of models)
• NetVista
• ThinkCentre

See also

• Predecessors to the IBM PC:
  • IBM 5100 (1975)
  • IBM 5110 (1978)
  • IBM 5120 (1980)
  • IBM System/23 Datamaster (1981)
• Japan-only IBM PC variants:
  • IBM 5550
  • IBM JX
  • IBM PS/55
  • IBM Palm Top PC 110
• IBM IntelliStation
• List of IBM products
• IBM PC compatible

References

General references

• Book: April 6, 1987 . IBM Personal System/2 and IBM Personal Computer Product Reference . 4.0 . International Business Machines Corporation . Bitsavers.
• Book: Mueller, Scott . 1994 . Upgrading and Repairing PCs . Que . 4th . 9781565299320 . the Internet Archive.

Footnotes

Notes and References

1. Hogan . Thom . September 14, 1981 . IBM Announces New Microcomputer System . InfoWorld . IDG Publications . 3 . 18 . 1, 14 . Google Books.
2. Book: Mueller, Scott . 1994 . Upgrading and Repairing PCs . Que . 4th . 9781565299320 . the Internet Archive.
3. Somerson . Paul . April 1983 . Revised Figures . PC Magazine . Ziff-Davis . 1 . 12 . 102 . Google Books.
4. Ditela . Steve . December 14, 1981 . Wizard in Your Home . New York . 14 . 49 . 46–72 . Google Books.
5. Book: November 1983 . Machine Preface . IBM Information Systems Group . MP 1.4 . the Internet Archive.
6. Book: April 1985 . A Guide to IBM Personal Computers . International Business Machines Corporation . Ardent Tool.
7. Book: November 1983 . Machine Preface . IBM Information Systems Group . MP 1.4 . the Internet Archive.
8. 1984 . IBM PC 1, PC/XT & Portable PC Personal Computers . Microcomputer Systems . Data Decisions . 3 . 13 . the Internet Archive.
9. Book: June 1984 . IBM Personal Computer Hardware Prices . IBM Product Center . obverse . the Vintage Technology Digital Archive.
10. Staff writer . June 11, 1984 . IBM Slashes PC Prices, Adds Memory; Drops 64KB . Electronic News . Sage Publications . 30 . 1501 . 24 . Gale.
11. Staff writer . June 12, 1984 . IBM Cuts Prices, Ups RAM . PC Week . Ziff-Davis . 1 . 23 . 1 . Gale . A company spokesman said the boost in memory [to 256 KB] was needed to accommodate the demand for more sophisticated applications, such a windowing. He added that although the 64K-byte systems will remain in production, the company eventually plans to phase them out..
12. Book: April 6, 1987 . IBM Personal System/2 and IBM Personal Computer Product Reference . 4.0 . International Business Machines Corporation . Bitsavers.
13. Sandler . Corey . April 1983 . IBM Drops the First Shoe . PC Magazine . Ziff-Davis . 1 . 12 . 90–102 . Google Books.
14. Sanger . David E. . June 24, 1987 . I.B.M. Optimistic on Newest PC's . The New York Times . D4 . ProQuest.
15. Sager . Ira . April 8, 1985 . IBM moves to reduce PC XT inventories . Electronic News . Sage Publications . 31 . 24 et seq. . Gale . The new floppy disk-based versions of the PC XT basically just strips the 10MB hard disk from the earlier unit. The machines come with base memory of 256KB and are available in either single or dual 360 KB diskette versions. A single diskette unit with keyboard and 256 KB of main memory is priced at $2,270, while the dual diskette version is priced at $2,570. A fully configured PC XT with 256 KB of RAM, a 360 KB diskette, keyboard, monochrome monitor and adapter, and operating system comes in at about $2,860..
16. Whitmore . Sam . April 8, 1986 . Product blitz may signal more aggressive IBM: firm ups ante for the makers of compatibles . PC Week . Ziff-Davis . 3 . 14 . 1 . Gale.
17. January 1984 . IBM 3770 Family Batch Communications Terminals . Distributed Processing & Intelligent Tennlnals . Datapro . C21-491-101 . Bitsavers.org.
18. Libes . Sol . February 28, 1984 . 3270 emulation board makers, beware! IBM is aiming at you . PC Week . Ziff-Davis . 1 . 28 . 25 et seq. . Gale.
19. Henkel . T. . October 24, 1983 . IBM Takes Wraps off Two Micros Capable of Accessing Mainframes . Computerworld . IDG Publications . 17 . 43 . 1, 10 . Google Books.
20. April 13, 1987 . IBM Gives Up on the Personal XT/, AT/370 . Computer Business Review . New Statesman Media Group . https://archive.today/20230920021426/https://techmonitor.ai/technology/ibm_gives_up_on_the_personal_xt_at370 . September 20, 2023.
21. 1984 . IBM PCjr . Microcomputer Systems . Data Decisions . 3 . 6 . the Internet Archive.
22. Kicking Junior Out of the Family . https://web.archive.org/web/20090625185216/http://www.time.com/time/magazine/article/0%2C9171%2C964850%2C00.html . June 25, 2009 . February 23, 2011 . Castro . Janice . Bob Buderi . Thomas McCarroll . April 1, 1985 . Time . Time Inc. . dead .
23. Staff writer . June 18, 1984 . IBM cuts micro prices . Computerworld . IDG Publications . XVIII . 25 . 8 . Google Books.
24. Whitmore . Sam . August 14, 1984 . IBM's New Generation: The PC AT: AT Hikes CPU Speed Sixfold, Memory Fivefold . PC Week . Ziff-Davis . 1 . 32 . 1 . Gale . The IBM PC AT Base Model 68, with one 1.2-megabyte floppy-disk drive, will sell for $3,995, according to a source close to IBM. Model 99, with a 1.2-megabyte floppy-disk drive and a 20-megabyte hard disk, will cost $5,795. Both models will use a 6-MHz 80286 microprocessor..
25. Abruzzese . George . June 29, 1987 . IBM Plans to Terminate Remainder of PC Line . InfoWorld . IDG Publications . 9 . 26 . 1, 69 . Google Books.
26. Kuzbyt . Bob . October 7, 1985 . IBM introduces 30-MB 5.25-inch Winchester disk drive for AT . Electronic News . Sage Publications . 31 . 26 . Gale.
27. Ristelhueber . Robert . Ira Sager . September 8, 1986 . 4 PC suppliers add 286 units in battle with compatibles . Electronic News . Sage Publications . 32 . 1 et seq. . Gale.
28. Whitmore . Sam . January 14, 1986 . IBM Debuts PC AT-Based Point-of-Sale Retail System . PC Week . Ziff-Davis . 3 . 2 . 8 . Gale.
29. Whitmore . Sam . April 1, 1986 . IBM meetings said to key on new products . PC Week . Ziff-Davis . 3 . 13 . 1 . Gale.
30. Sandker . C. . October 8, 1985 . IBM Delivers New PC AT Featuring 30M-Byte Disk: Sets a Price Tag of $5,995 . PC Week . Ziff-Davis . 2 . 40 . 1 . Gale.
31. 1987 . Desktop Systems . PC Tech Journal . Ziff-Davis . 4 . 13 . 69 . the Internet Archive.
32. Web site: Kennedy . Don . April 2, 1986 . IBM has boosted the processor speed and storage capacity of its personal computer models . PR Newswire . NYPR14C . Gale.
33. Web site: Kennedy . Don . April 2, 1986 . IBM has boosted the processor speed and storage capacity of its personal computer models . PR Newswire . NYPR14C . Gale.
34. Bridges . Linda . Laura Brennan . Jim Forbes . Bruce Stephen . July 7, 1987 . PC managers regrouping after XT, AT closeout . PC Week . Ziff-Davis . 4 . 27 . 4 . Gale . IBM's recent announcement that it will formally discontinue its PC XT line and eventually phase out its PC AT came as no surprise to many corporate users. [...] William Lowe, president of IBM's Entry Systems Division in Boca Raton, Fla., told Wall Street analysts on June 30 that the only remaining XT, the XT 286, will be discontinued within three months and that IBM is working with dealers and large accounts to determine how many more ATs it will make to fill orders..
35. Web site: Staff writer . April 25, 1984 . Industrial-strength PC XT . UPI.com . United Press International . https://archive.today/20230920211216/https://www.upi.com/Archives/1984/04/25/Industrial-strength-PC-XT/2249451717200/ . September 20, 2023.
36. Web site: May 21, 1985 . IBM Announcement Letter Number 185-053: IBM 7531 Industrial Computer . International Business Machines Corporation . https://web.archive.org/web/20070624110258/https://www.9999hp.net/7531/185-053.txt . June 24, 2007 . 9999hp.net.
37. April 29, 1985 . IBM unveils entry-level 5531 model . Computerworld . IDG Publications . XIX . 17 . 48 . Google Books.
38. Web site: IBM 7552 Industrial Computer Model 540 Announcement Letter. November 3, 1987. Industrial Business Machines. Ardent Tool. September 29, 2021.
39. Book: Kono, M. E.. Surface Computer System Architecture for the Advanced Unmanned Search System (AUSS). Naval Command, Control and Ocean Surveillance Center. December 1992. Ardent Tool. 3.
40. Wallace. Bob. IBM uncloaks industrial micro as network gateway. 3. 33. Google Books. Network World. October 20, 1986. IDG Publications.
41. Cleaveland. Peter. April 21, 1987. 61. 5. 31. Instrumentation & Control Systems. Reed Business Information Enterprise. Low-cost, flexible microcomputers get jobs in factories. 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..