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The original IBM Personal Computer, with monitor and keyboard 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.
Models
Original line
IBM Personal Computer AT models
Type
Date announced
Date withdrawn
Bus
No. of slotsNo. of baysProcessor
Clock speed(MHz)
Stock onboard RAM(KB)
Maximum onboard RAM(KB)
FDD HDD Notes
Ref(s).
Personal Computer 5150-001
August 1981 March 1983 ISA , 8-bit5
2
Intel 8088 4.77
16 KB
64 KB
none
none
Diskless model; only means of data storage is through IBM Cassette BASIC
[ 1] : 1 [ 2] : 167, 1050 [ 3]
Personal Computer 5150-003
August 1981 March 1983 ISA , 8-bit5
2
Intel 8088 4.77
48 KB
64 KB
160 KB
none
Single-sided, double-density floppy disk drive
[ 1] : 1 [ 4] : 47 [ 2] : 167, 1050 [ 3]
Personal Computer 5150-013
Unknown
Unknown
ISA , 8-bit5
2
Intel 8088 4.77
Unknown
Unknown
Unknown
Unknown
[ 5] : 228
Personal Computer 5150-014
Unknown
March 1983 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
64 KB
160 KB
none
[ 6] [ 3] [ 7] : 11-15
Personal Computer 5150-064
Unknown
March 1983 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
64 KB
320 KB
none
[ 6] [ 3] : 11-15
Personal Computer 5150-074
Unknown
March 1983 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
64 KB
two 320 KB
none
[ 6] [ 3] : 11-15
Personal Computer 5150-X14
Unknown
March 1983 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
64 KB
160 KB
none
Shipped without keyboard; includes adapter for integration with IBM 3278 terminal systems
[ 6] [ 8] [ 3] : 11-15
Personal Computer 5150-X64
Unknown
March 1983 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
64 KB
320 KB
none
Shipped without keyboard; includes adapter for integration with IBM 3278 terminal systems
[ 6] [ 8] [ 3] : 11-15
Personal Computer 5150-X74
Unknown
March 1983 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
64 KB
two 320 KB
none
Shipped without keyboard; includes adapter for integration with IBM 3278 terminal systems
[ 6] [ 8] [ 3] : 11-15
Personal Computer 5150-114
Unknown
June 1984 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
256 KB
160 KB
none
[ 5] : 228 [ 8] [ 9] [ 10]
Personal Computer 5150-164
Unknown
June 1984 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
256 KB
320 KB
none
[ 5] : 228 [ 8] [ 9] [ 10]
Personal Computer 5150-174
Unknown
June 1984 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
256 KB
two 320 KB
none
[ 5] : 236 [ 8] [ 10]
Personal Computer 5150-104
June 1984 April 1987 ISA , 8-bit5
2
Intel 8088 4.77
64 KB
256 KB
none
none
Diskless model; only means of data storage is through IBM Cassette BASIC
[ 5] : 228 [ 8] [ 9] [ 6] : 11-10 [ 10]
Personal Computer 5150-166
June 1984 April 1987 ISA , 8-bit5
2
Intel 8088 4.77
256 KB
256 KB
360 KB
none
[ 5] : 236 [ 11] [ 10]
Personal Computer 5150-176
June 1984 April 1987 ISA , 8-bit5
2
Intel 8088 4.77
256 KB
256 KB
two 360 KB
none
[ 5] : 236 [ 11] [ 10]
Personal Computer 5150-X66
June 1984 December 1985 ISA , 8-bit5
2
Intel 8088 4.77
256 KB
256 KB
360 KB
none
Shipped without keyboard
[ 5] : 236
Personal Computer 5150-X76
June 1984 December 1985 ISA , 8-bit5
2
Intel 8088 4.77
256 KB
256 KB
two 360 KB
none
Shipped without keyboard
[ 5] : 236
Personal Computer XT 5160-087
March 1983 June 1984 ISA , 8-bit8
2
Intel 8088 4.77
128 KB
640 KB
360 KB
10 MB
[ 5] : 236 [ 12] [ 2] : 1068
Personal Computer XT 5160-086
June 1984 June 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
360 KB
10 MB
[ 5] : 236 [ 11] [ 13] [ 14]
Personal Computer XT 5160-068
April 1985 June 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
360 KB
none
[ 5] : 236 [ 2] : 1068 [ 15] [ 13] [ 14]
Personal Computer XT 5160-078
April 1985 June 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
two 360 KB
none
[ 5] : 236 [ 2] : 1068 [ 15] [ 13] [ 14]
Personal Computer XT 5160-088
April 1986 June 1987 ISA , 8-bit8
2
Intel 8088 4.77
512 KB
640 KB
360 KB
20 MB
Shipped with original IBM PC "Model F" keyboard
[ 5] : 236 [ 16] [ 13] [ 14]
Personal Computer XT 5160-089
April 1986 June 1987 ISA , 8-bit8
2
Intel 8088 4.77
512 KB
640 KB
360 KB
20 MB
Shipped with Enhanced Keyboard
[ 5] : 236 [ 16] [ 13] [ 14]
Personal Computer XT 5160-267
April 1986 June 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
360 KB
none
Shipped with original IBM PC "Model F" keyboard
[ 5] : 236 [ 16] [ 13] [ 14]
Personal Computer XT 5160-268
April 1986 June 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
360 KB
none
Shipped with Enhanced Keyboard
[ 5] : 236 [ 16]
Personal Computer XT 5160-277
April 1986 June 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
two 360 KB
none
Shipped with original IBM PC "Model F" keyboard
[ 16]
Personal Computer XT 5160-278
April 1986 June 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
two 360 KB
none
Shipped with Enhanced Keyboard
[ 5] : 236 [ 16]
3270 PC 5271-000
Unknown
July 1987 ISA , 8-bit8
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
October 1983 July 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
360 KB
none
Without printer adapter and fixed disk adapter
[ 5] : 49 [ 11] [ 19] : 10 [ 18]
3270 PC 5271-004
October 1983 July 1987 ISA , 8-bit8
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
[ 5] : 49 [ 11] [ 19] : 10 [ 18]
3270 PC 5271-006
October 1983 July 1987 ISA , 8-bit8
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
[ 5] : 49 [ 11] [ 19] : 10 [ 18]
Personal Computer XT/370 5160-568
October 1984 April 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
360 KB
none
[ 5] : 236 [ 19] [ 20]
Personal Computer XT/370 5160-588
October 1984 April 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
360 KB
10 MB
[ 5] : 236 [ 19] [ 20]
Personal Computer XT/370 5160-589
October 1984 April 1987 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
640 KB
360 KB
10 MB
[ 5] : 236 [ 20]
PCjr 4860-004
November 1983 March 1985 Custom
— N/a — N/a Intel 8088 4.77
64 KB
128 KB
none
none
[ 21] [ 22]
PCjr 4860-067
November 1983 March 1985 Custom
— N/a — N/a Intel 8088 4.77
128 KB
128 KB
360 KB
none
[ 21] [ 22]
Portable Personal Computer 5155-068
February 1984 June 1984 ISA , 8-bit8
2
Intel 8088 4.77
256 KB
512 KB
360 KB
none
[ 8]
Portable Personal Computer 5155-076
June 1984 Unknown
ISA , 8-bit8
2
Intel 8088 4.77
256 KB
512 KB
two 360 KB
none
[ 5] : 228 [ 23]
Personal Computer AT 5170-068
August 1984 June 1987 ISA , 16-bit8
3
Intel 80286 6
256 KB
512 KB
1.2 MB
none
[ 5] : 49 [ 24] [ 25]
Personal Computer AT 5170-099
August 1984 June 1987 ISA , 16-bit8
3
Intel 80286 6
512 KB
512 KB
1.2 MB
20 MB
[ 5] : 236 [ 24] [ 25]
Personal Computer AT 5170-239
October 1985 September 1986 ISA , 16-bit8
3
Intel 80286 6
512 KB
512 KB
1.2 MB
30 MB
[ 5] : 236 [ 26] [ 27]
Personal Computer AT 5170-839
January 1986 June 1987 ISA , 16-bit8
3
Intel 80286 6
512 KB
512 KB
1.2 MB
two 30 MB
Includes controllers for the IBM 4680 Store System
[ 5] : 236 [ 28] [ 25]
Personal Computer AT 5170-899
January 1986 June 1987 ISA , 16-bit8
3
Intel 80286 6
512 KB
512 KB
1.2 MB
two 20 MB
Includes controllers for the IBM 4680 Store System
[ 5] : 236 [ 28] [ 25]
Personal Computer AT 5170-319
April 1986 June 1987 ISA , 16-bit8
3
Intel 80286 8
512 KB
512 KB
1.2 MB
30 MB
[ 5] : 236 [ 29] [ 25]
Personal Computer AT 5170-339
April 1986 July 1987 ISA , 16-bit8
3
Intel 80286 8
512 KB
512 KB
1.2 MB
30 MB
Shipped with Enhanced Keyboard
[ 5] : 236 [ 29] [ 25]
Personal Computer AT 5171-168
October 1986 June 1987 ISA , 16-bit8
3
Intel 80286 8
512 KB
512 KB
1.2 MB
none
Built to TEMPEST specifications
[ 5] : 64 [ 25]
Personal Computer AT 5171-339
October 1986 July 1987 ISA , 16-bit8
3
Intel 80286 8
512 KB
512 KB
1.2 MB
30 MB
Built to TEMPEST specifications
[ 5] : 64 [ 25]
Personal Computer AT/370 5170-599
October 1984 April 1987 ISA , 16-bit8
3
Intel 80286 6
512 KB
512 KB
1.2 MB
20 MB
[ 5] : 202 [ 20]
Personal Computer AT/370 5170-739
October 1985 April 1987 ISA , 16-bit8
3
Intel 80286 6
512 KB
512 KB
1.2 MB
30 MB
[ 5] : 202 [ 30] [ 31] [ 20]
Personal Computer AT/370 5170-919
April 1986 April 1987 ISA , 16-bit8
3
Intel 80286 6
512 KB
512 KB
1.2 MB
30 MB
1 MB total RAM (peripheral)
[ 5] : 57 [ 32] [ 20]
Personal Computer AT/370 5170-939
April 1986 April 1987 ISA , 16-bit8
3
Intel 80286 6
512 KB
512 KB
1.2 MB
30 MB
1 MB total RAM (peripheral); shipped with Enhanced Keyboard
[ 5] : 57 [ 32] [ 20]
PC Convertible 5140-002
April 1986 Unknown
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
April 1986 Unknown
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
September 1986 October 1987 ISA , 16-bit8
2
Intel 80286 6
640 KB
640 KB
1.2 MB
20 MB
[ 5] : 48 [ 27] [ 14]
Industrial Computer 5531 5531-001
October 1983 Unknown
ISA , 8-bit8
3
Intel 8088 4.77
128 KB
640 KB
360 KB
10 MB
Industrial version of the IBM PC XT[ 33] [ 34]
Industrial Computer 5531 5531-011
April 1984 Unknown
ISA , 8-bit8
3
Intel 8088 4.77
256 KB
640 KB
1.2 MB
none
Industrial version of the IBM PC XT[ 33] [ 34] [ 35]
Industrial Computer 5531 5531-021
May 1985 Unknown
ISA , 8-bit8
3
Intel 8088 4.77
256 KB
640 KB
1.2 MB
20 MB
Industrial version of the IBM PC XT[ 33] [ 34]
7531 Industrial Computer 7531-041
May 1985 Unknown
ISA , 16-bit8
3
Intel 80286 6
512 KB
1 MB
Unknown
Unknown
Industrial version of the IBM PC AT, tower form-factor
7532 Industrial Computer 7532-041
May 1985 Unknown
ISA , 16-bit8
3
Intel 80286 6
512 KB
1 MB
Unknown
Unknown
Industrial version of the IBM PC AT, 19-inch rack-mountable form factor
Industrial Computer 7552 7552-040
October 1986 Unknown
ISA , 16-bitMCA , 16-bit (undocumented) 8 (modules, 7 fillable)
3 (as modules)
Intel 80286 10
4 MB
Unknown
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
[ 36] [ 37] [ 38] [ 39]
Industrial Computer 7552 7552-140
October 1986 Unknown
ISA , 16-bitMCA , 16-bit (undocumented) 8 (modules, 7 fillable)
3 (as modules)
Intel 80286 10
4 MB
Unknown
one 1.44 MB (as a module)
20 MB (as a module, 40 MB as two identical modules)
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
[ 36] [ 37] [ 38] [ 39]
Timeline
Timeline of the IBM Personal Computer
Asterisk (*) denotes a model released in Japan only
References
Footnotes
1 2 Hogan, Thom (September 14, 1981). "IBM Announces New Microcomputer System" . InfoWorld . 3 (18). IDG Publications: 1, 14 – via Google Books. 1 2 3 4 5 Mueller, Scott (1994). Upgrading and Repairing PCs ed.). Que. ISBN 9781565299320 – via the Internet Archive. 1 2 3 4 5 6 7 8 Somerson, Paul (April 1983). "Revised Figures" . PC Magazine . 1 (12). Ziff-Davis: 102 – via Google Books. ↑ Ditela, Steve (December 14, 1981). "Wizard in Your Home" . New York . 14 (49): 46– 72 – via Google Books. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 IBM Personal System/2 and IBM Personal Computer Product Reference (PDF) (4.0 ed.). International Business Machines Corporation. April 6, 1987 – via Bitsavers .1 2 3 4 5 6 7 Machine Preface MP 1.4 – via the Internet Archive.↑ A Guide to IBM Personal Computers (PDF) . International Business Machines Corporation. April 1985 – via Ardent Tool.1 2 3 4 5 6 7 8 "IBM PC 1, PC/XT & Portable PC Personal Computers" . Microcomputer Systems . 3 . Data Decisions: 13. 1984 – via the Internet Archive.1 2 3 IBM Personal Computer Hardware Prices (PDF) . IBM Product Center. June 1984. p. obverse – via the Vintage Technology Digital Archive.1 2 3 4 5 6 Staff writer (June 12, 1984). "IBM Cuts Prices, Ups RAM" . PC Week . 1 (23). Ziff-Davis: 1 – via 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. 1 2 3 4 5 6 Staff writer (June 11, 1984). "IBM Slashes PC Prices, Adds Memory; Drops 64KB" . Electronic News . 30 (1501). Sage Publications: 24 – via Gale. ↑ Sandler, Corey (April 1983). "IBM Drops the First Shoe" . PC Magazine . 1 (12). Ziff-Davis: 90– 102 – via Google Books. 1 2 3 4 5 6 Sanger, David E. (June 24, 1987). "I.B.M. Optimistic on Newest PC's" . The New York Times : D4. ProQuest 426534977 . 1 2 3 4 5 6 7 Bridges, Linda; Laura Brennan; Jim Forbes; Bruce Stephen (July 7, 1987). "PC managers regrouping after XT, AT closeout" . PC Week . 4 (27). Ziff-Davis: 4 – via 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. 1 2 Sager, Ira (April 8, 1985). "IBM moves to reduce PC XT inventories" . Electronic News . 31 . Sage Publications: 24 et seq – via 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. 1 2 3 4 5 6 Whitmore, Sam (April 8, 1986). "Product blitz may signal more aggressive IBM: firm ups ante for the makers of compatibles" . PC Week . 3 (14). Ziff-Davis: 1 – via Gale. ↑ "IBM 3770 Family Batch Communications Terminals" (PDF) . Distributed Processing & Intelligent Terminals . Datapro: C21-491-101. January 1984 – via Bitsavers.org.1 2 3 4 Libes, Sol (February 28, 1984). "3270 emulation board makers, beware! IBM is aiming at you" . PC Week . 1 (28). Ziff-Davis: 25 et seq – via Gale. 1 2 3 4 5 Henkel, T. (October 24, 1983). "IBM Takes Wraps off Two Micros Capable of Accessing Mainframes" . Computerworld . 17 (43). IDG Publications: 1, 10 – via Google Books. 1 2 3 4 5 6 7 "IBM Gives Up on the Personal XT/, AT/370" . Computer Business Review . New Statesman Media Group. April 13, 1987.{{cite journal }}: CS1 maint: deprecated archival service (link )1 2 "IBM PCjr" . Microcomputer Systems . 3 . Data Decisions: 6. 1984 – via the Internet Archive.1 2 Castro, Janice; Bob Buderi; Thomas McCarroll (April 1, 1985). "Kicking Junior Out of the Family" . Time . Time Inc. Archived from the original on June 25, 2009. Retrieved February 23, 2011 . ↑ Staff writer (June 18, 1984). "IBM cuts micro prices" . Computerworld . XVIII (25). IDG Publications: 8 – via Google Books. 1 2 Whitmore, Sam (August 14, 1984). "IBM's New Generation: The PC AT: AT Hikes CPU Speed Sixfold, Memory Fivefold" . PC Week . 1 (32). Ziff-Davis: 1 – via 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. 1 2 3 4 5 6 7 8 Abruzzese, George (June 29, 1987). "IBM Plans to Terminate Remainder of PC Line" . InfoWorld . 9 (26). IDG Publications: 1, 69 – via Google Books. ↑ Kuzbyt, Bob (October 7, 1985). "IBM introduces 30-MB 5.25-inch Winchester disk drive for AT" . Electronic News . 31 . Sage Publications: 26 – via Gale. 1 2 Ristelhueber, Robert; Ira Sager (September 8, 1986). "4 PC suppliers add 286 units in battle with compatibles" . Electronic News . 32 . Sage Publications: 1 et seq – via Gale. 1 2 Whitmore, Sam (January 14, 1986). "IBM Debuts PC AT-Based Point-of-Sale Retail System" . PC Week . 3 (2). Ziff-Davis: 8 – via Gale. 1 2 Whitmore, Sam (April 1, 1986). "IBM meetings said to key on new products" . PC Week . 3 (13). Ziff-Davis: 1 – via Gale. ↑ Sandker, C. (October 8, 1985). "IBM Delivers New PC AT Featuring 30M-Byte Disk: Sets a Price Tag of $5,995" . PC Week . 2 (40). Ziff-Davis: 1 – via Gale. ↑ "Desktop Systems" . PC Tech Journal . 4 (13). Ziff-Davis: 69. 1987 – via the Internet Archive.1 2 Kennedy, Don (April 2, 1986). "IBM has boosted the processor speed and storage capacity of its personal computer models" . PR Newswire. p. NYPR14C – via Gale. 1 2 3 Staff writer (April 25, 1984). "Industrial-strength PC XT" . UPI.com . United Press International. {{cite web }}: CS1 maint: deprecated archival service (link )1 2 3 "IBM 7531 Industrial Computer" (Announcement letter). International Business Machines Corporation. May 21, 1985. 185-053.↑ "IBM unveils entry-level 5531 model" . Computerworld . XIX (17). IDG Publications: 48. April 29, 1985 – via Google Books.1 2 "IBM 7552 Industrial Computer Model 540" (Announcement Letter). Industrial Business Machines Corporation. November 3, 1987. Retrieved January 19, 2025 .1 2 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. 1 2 Wallace, Bob (October 20, 1986). "IBM uncloaks industrial micro as network gateway" . Network World . 3 (33). IDG Publications – via Google Books. 1 2 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.
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