IBM PC XT (5160): Difference between revisions

IBM Personal Computer XT
	IBM Personal Computer XT (5160)
Specifications
Developer	IBM Entry Systems Division, Boca Raton
Manufacturer	IBM
Type	Desktop personal computer
Released	March 8, 1983
Discontinued	April 1987 (XT 286 production ended late 1987)
CPU	Intel 8088 @ 4.77 MHz; Optional Intel 8087 FPU
Memory	128 KB – 640 KB on-board (depends on motherboard revision)
Storage	10 MB or 20 MB MFM hard drive (Seagate ST-412 or ST-225); one or two 360 KB 5.25" floppy drives
Display	MDA + IBM 5151 or CGA + IBM 5153 (separate adapter card)
Sound	Internal PC speaker, driven by Intel 8253-5 timer channel 2
Dimensions	19.5" W × 16" D × 5.5" H (50 × 41 × 14 cm)
Weight	32 lb (15 kg)
OS / Firmware	IBM PC DOS 2.0 – 3.20; PC/IX; SCO Xenix; IBM Cassette BASIC in ROM
Predecessor	IBM PC (5150)
Successor	IBM Personal Computer AT (5170); direct PS/2-era replacement was the IBM PS/2 Model 30
Model no.	5160

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Revision as of 11:02, 21 May 2026

The IBM Personal Computer XT (model 5160, often shortened to PC/XT) is the second computer in the IBM PC line, released on March 8, 1983 and discontinued in April 1987 (with the related XT 286 5162 continuing into late 1987). The XT shares its Intel 8088 CPU and 8-bit ISA bus with the original 5150 and is fully software-compatible. The major differences from the 5150 are an increase in expansion slots from five to eight, a base RAM of at least 128 KB, a redesigned two-chip BIOS, an included Asynchronous Adapter (serial card), a 130 W power supply, and a built-in 10 MB hard drive (later 20 MB) on most submodels. The 5150's cassette port was removed.

IBM never officially expanded "XT" to a phrase; some press materials of the era expanded it as "eXtended Technology".

Architecture and Processor

The XT uses an Intel 8088 running at 4.77 MHz, the same CPU as the 5150. A second socket on the motherboard accepts an Intel 8087 floating-point coprocessor sold separately.

The support-chip family is the same as the 5150's:

Intel 8259A — programmable interrupt controller.
Intel 8237A-5 — DMA controller (also handles DRAM refresh).
Intel 8253-5 — programmable interval timer (system tick, refresh trigger, speaker).
Intel 8255A-5 — programmable peripheral interface (keyboard input, DIP-switch readback, speaker enable).
Motorola MC6845 — CRT controller, on the MDA or CGA display adapter, not on the motherboard.

There is no battery-backed CMOS — hardware configuration is set through DIP switches on the motherboard.

Memory and ROM

The XT has two motherboard revisions, identified by silkscreen marking:

**IBM 5160 motherboard revisions**
Silkscreen marking	RAM banks	BIOS shipped	Notes
64-256KB (early)	4 × 64 KB	11/08/82	Also found in the IBM 5155 Portable PC. Can be modified to support 640 KB on-board (IBM-supported procedure).
256-640KB (later)	2 × 256 KB + 2 × 64 KB	01/10/86 or 05/09/86	Native support for 640 KB on-board.

The XT motherboard carries the BIOS in two sockets (U18 and U19), unlike the 5150's single BIOS chip in U33. The U19 socket on early-revision boards also contains part of IBM Cassette BASIC; on later 1986-dated BIOSes, U19 is shared between BIOS and Cassette BASIC.

BIOS revisions

**IBM 5160 BIOS revisions**
Date	U18 / U19 part numbers	ROM type	Floppy support	Notes
08/16/82	U18=5000026, U19=5000027	MK38000 / MK37000 mask ROM	360 KB	Possibly never publicly released; very rare.
11/08/82	U18=1501512, U19=5000027 (or 6359116)	Mask ROM, varies	360 KB, partial 720 KB support	Standard first-production BIOS.
01/10/86	U18=62X0851, U19=62X0854 (or U18=62X0852, U19=62X0853)	27256 EPROM	360 KB and 720 KB	Adds Enhanced Keyboard support and 1.2 MB drive code (HD floppy controller still required).
05/09/86	U18=62X0890, U19=68X4370 (or 59X7268 / 62X0819)	27256 EPROM	360 KB and 720 KB	Final XT BIOS.

The 1986-dated BIOS revisions have two notable caveats: they may produce a specific symptom documented by minuszerodegrees.net, and they may not support an IBM 5161 expansion chassis.

On the 1982-dated BIOS revisions, chip U19 contains part of Cassette BASIC and is not critical to operation. If the POST detects a failed U19, it displays "F6000 ROM" but continues booting. On the 1986-dated BIOS revisions U19 also contains part of the BIOS, so a failed U19 produces a 'dead' motherboard.

Storage and Expansion

Eight 8-bit ISA slots (compared to five on the 5150). The slots are at slightly narrower spacing than the 5150's, so some multi-board cards will not physically fit. Two slots (behind the hard drive cage) cannot accept full-length cards. Slot 8 has a special "slot 8 compatible" requirement — non-compatible cards in slot 8 generate an 1801 error at POST.
Floppy disk drive — one or two 5.25" 360 KB full-height drives (Tandon TM100-2 or equivalent). Later submodels switched to half-height drives.
Built-in hard drive — a 10 MB Seagate ST-412 with Xebec 1210 MFM controller was the standard configuration. Later submodels shipped with a 20 MB ST-225 half-height drive.
No cassette port (removed from the 5150 design).
Included Asynchronous Adapter — serial card with 8250 UART, standard on most submodels.
Optional IBM 5161 Expansion Unit — adds eight more ISA slots and room for two more full-height drives, connected via an Extender Card in the host and a Receiver Card in the 5161.

Display

The XT has no on-board video; video is provided by an ISA adapter card driving a separate monitor:

MDA + IBM 5151 for 80×25 monochrome text.
CGA + IBM 5153 for text and graphics.
From 1985, the EGA and the PGA became available as options.

Submodel 5160-788 was the only XT sold with CGA as standard equipment.

Keyboard

Most XTs shipped with the same IBM Model F (83-key) keyboard as the 5150, on a DIN-5 connector using the XT keyboard protocol. From 1986, submodels 268, 278, and 089 shipped with a 101-key Enhanced Keyboard variant (a Model M-style keyboard in a modified form that used the XT's keyboard protocol and lacked LEDs).

Power Supply

A 130 W power supply (compared to the 5150's 63.5 W / 130 W Type 1/2). XTs sold in the US were configured for 120 V only; international units shipped with switchable PSUs.

Submodels

The XT was sold in many submodels. The following table is from the IBM Personal Computer Family Service Information Manual (January 1989, SA38-0037-00).

**Selected IBM PC XT submodels**
Submodel	On-board RAM	Floppy	Hard disk	Keyboard / notes
5160-086	256 KB	360 KB	10 MB
5160-087	128 KB	360 KB	10 MB
5160-068	256 KB	360 KB	none
5160-078	256 KB	2 × 360 KB	none
5160-088	512 KB	360 KB	20 MB	Original Model F keyboard
5160-089	512 KB	360 KB	20 MB	Enhanced (101-key) keyboard
5160-267	256 KB	360 KB	none	Original Model F keyboard
5160-268	256 KB	360 KB	none	Enhanced keyboard
5160-277	256 KB	2 × 360 KB	none	Original Model F keyboard
5160-278	256 KB	2 × 360 KB	none	Enhanced keyboard
5160-788	varies	360 KB	10 MB	CGA standard
5160-568, -588, -589	256 KB	360 KB	0 or 10 MB	XT/370 — adds a System/370 co-processor board
3270 PC (5271)	256-384 KB	360 KB	0 or 10 MB	3270 terminal emulation variant
5162-286 (XT 286)	640 KB	1.2 MB HD	20 MB	6 MHz Intel 80286, 16-bit ISA, zero wait states

General Maintenance

Cleaning procedures, PSU voltage checks, and preventive care for the XT are documented in IBM PC XT Maintenance Guide.

Troubleshooting

POST beep codes, parity errors, MFM hard drive faults and the XT-specific known problems (1801 slot-8 error, POST looping when SW1 bit 1 is ON, 1986-BIOS quirks) are documented in IBM PC XT Troubleshooting Guide.

Capacitor Replacement

The 5160 motherboard has 16 tantalum capacitors total: 13 on the +5 V line and 2 on the +12 V line (one of which is C56, a well-known short-circuit failure). The procedure and per-position photos are in IBM PC XT Capacitor Replacement Guide.

Gallery

IBM 5160 PC XT
Silkscreen marking for the early 64-256KB motherboard (minuszerodegrees.net)
Silkscreen marking for the late 256-640KB motherboard (minuszerodegrees.net)

Related Pages

IBM PC XT Maintenance Guide
IBM PC XT Troubleshooting Guide
IBM PC XT Capacitor Replacement Guide
IBM PC (5150) — predecessor
IBM 5161 Expansion Unit
IBM Fixed Disk Adapter
IBM Model F (83-key)
IBM Monochrome Display Adapter / IBM Color Graphics Adapter

References

IBM Personal Computer XT — Wikipedia. Source for the submodel list, dimensions (19.5 × 16 × 5.5 in), weight (32 lb / 15 kg), and the relationship to the 5161 and XT 286.
IBM 5160 — Motherboard Versions, minuszerodegrees.net. Source for the 64-256KB / 256-640KB revision details.
IBM 5160 — BIOS Revisions, minuszerodegrees.net. Source for the four BIOS revisions, IBM part numbers, and floppy support details.
IBM PC-XT (1983) — DOS Days. Reference for original configuration and chronology.
IBM, Personal Computer Family Service Information Manual (January 1989, document SA38-0037-00). Source for the submodel table.
IBM, Personal Computer Hardware Reference Library: Guide to Operations, Personal Computer XT (Part number 6936831, 1983).

@@ Line 7: / Line 7: @@
 | type          = Desktop personal computer
 | release date  = March 8, 1983
+| discontinued  = April 1987 (XT 286 production ended late 1987)
 | cpu           = Intel 8088 @ 4.77 MHz<br/>Optional Intel 8087 FPU
-| memory        = 128 KB on-board base configuration; expandable to 640 KB
+| memory        = 128 KB &ndash; 640 KB on-board (depends on motherboard revision)
-| storage       = One 360 KB 5.25" floppy + one 10 MB MFM hard disk (standard); 20 MB option from later production
+| storage       = 10&nbsp;MB or 20&nbsp;MB MFM hard drive (Seagate ST-412 or ST-225); one or two 360 KB 5.25" floppy drives
-| display       = MDA + [[IBM 5151]] or CGA + [[IBM 5153]] (separate adapter card)
+| display       = [[IBM Monochrome Display Adapter|MDA]] + [[IBM 5151]] or [[IBM Color Graphics Adapter|CGA]] + [[IBM 5153]] (separate adapter card)
-| sound         = Internal PC speaker via Intel 8253-5
+| sound         = Internal PC speaker, driven by Intel 8253-5 timer channel 2
-| os            = IBM PC DOS 2.0 onwards; XENIX 86; CP/M-86
+| dimensions    = 19.5" W × 16" D × 5.5" H (50 × 41 × 14 cm)
+| weight        = 32 lb (15 kg)
+| os            = IBM PC DOS 2.0 &ndash; 3.20; PC/IX; SCO Xenix; [[IBM Cassette BASIC]] in ROM
 | predecessor   = [[IBM PC (5150)]]
-| codename      = (continuation of the Acorn / Chess project)
+| successor     = IBM Personal Computer AT (5170); direct PS/2-era replacement was the IBM PS/2 Model 30
 | model         = 5160
 }}
-The '''IBM Personal Computer XT''' (model '''5160''', "eXtended Technology") is the second-generation IBM PC, announced March 8, 1983. It uses the same Intel 8088 at 4.77 MHz as the [[IBM PC (5150)|5150]] and is software-compatible with it, but adds three things the 5150 lacked at launch:
+The '''IBM Personal Computer XT''' (model '''5160''', often shortened to '''PC/XT''') is the second computer in the IBM PC line, released on March 8, 1983 and discontinued in April 1987 (with the related XT 286 5162 continuing into late 1987). The XT shares its Intel 8088 CPU and 8-bit ISA bus with the original [[IBM PC (5150)|5150]] and is fully software-compatible. The major differences from the 5150 are an increase in expansion slots from five to eight, a base RAM of at least 128 KB, a redesigned two-chip BIOS, an included Asynchronous Adapter (serial card), a 130 W power supply, and a built-in 10 MB hard drive (later 20 MB) on most submodels. The 5150's cassette port was removed.
-* '''Built-in hard disk support''' — every XT shipped with a 10 MB MFM hard disk (later 20 MB), driven by the [[IBM Fixed Disk Adapter]] card. The standard hard drive was a Seagate ST-412 paired with a Xebec 1210 MFM controller.
+IBM never officially expanded "XT" to a phrase; some press materials of the era expanded it as "eXtended Technology".
-* '''A 130 W power supply''' — sufficient to run the hard disk.
-* '''Eight ISA slots''' instead of the 5150's five, on a redesigned motherboard.
-The XT motherboard also drops the cassette port, ships with a serial card (8250 UART) as standard, and uses the same [[IBM Model F (83-key)|83-key Model F]] keyboard as the 5150.
+== Architecture and Processor ==
-== Key Differences from the 5150 ==
+The XT uses an '''Intel 8088''' running at '''4.77 MHz''', the same CPU as the 5150. A second socket on the motherboard accepts an '''Intel 8087''' floating-point coprocessor sold separately.
+The support-chip family is the same as the 5150's:
+* '''Intel 8259A''' — programmable interrupt controller.
+* '''Intel 8237A-5''' — DMA controller (also handles DRAM refresh).
+* '''Intel 8253-5''' — programmable interval timer (system tick, refresh trigger, speaker).
+* '''Intel 8255A-5''' — programmable peripheral interface (keyboard input, DIP-switch readback, speaker enable).
+* '''Motorola MC6845''' — CRT controller, on the [[IBM Monochrome Display Adapter|MDA]] or [[IBM Color Graphics Adapter|CGA]] display adapter, not on the motherboard.
+There is no battery-backed CMOS — hardware configuration is set through DIP switches on the motherboard.
+== Memory and ROM ==
+The XT has two motherboard revisions, identified by silkscreen marking:
 <templatestyles src="Template:StyledTable/styles.css" />
 {| class="wikitable styled-table" style="width:100%; text-align:center;"
-|+'''IBM 5150 vs. 5160'''
+|+'''IBM 5160 motherboard revisions'''
-! Feature !! 5150 !! 5160 (XT)
+! Silkscreen marking !! RAM banks !! BIOS shipped !! Notes
 |-
-| Year || 1981 || 1983
+| 64-256KB (early) || 4 × 64 KB || 11/08/82 || Also found in the IBM 5155 Portable PC. Can be modified to support 640 KB on-board (IBM-supported procedure).
+|-
+| 256-640KB (later) || 2 × 256 KB + 2 × 64 KB || 01/10/86 or 05/09/86 || Native support for 640 KB on-board.
+|}
+The XT motherboard carries the BIOS in two sockets (U18 and U19), unlike the 5150's single BIOS chip in U33. The U19 socket on early-revision boards also contains part of [[IBM Cassette BASIC]]; on later 1986-dated BIOSes, U19 is shared between BIOS and Cassette BASIC.
+=== BIOS revisions ===
+{| class="wikitable styled-table" style="width:100%; text-align:center;"
+|+'''IBM 5160 BIOS revisions'''
+! Date !! U18 / U19 part numbers !! ROM type !! Floppy support !! Notes
 |-
-| ISA slots || 5 || 8
+| 08/16/82 || U18=5000026, U19=5000027 || MK38000 / MK37000 mask ROM || 360 KB || Possibly never publicly released; very rare.
 |-
-| PSU || 63.5 W (Type 1) or 130 W (Type 2) || 130 W standard
+| 11/08/82 || U18=1501512, U19=5000027 (or 6359116) || Mask ROM, varies || 360 KB, partial 720 KB support || Standard first-production BIOS.
 |-
-| Hard disk || Optional, with Type 2 PSU || Standard (10 MB MFM, later 20 MB)
+| 01/10/86 || U18=62X0851, U19=62X0854 (or U18=62X0852, U19=62X0853) || 27256 EPROM || 360 KB and 720 KB || Adds Enhanced Keyboard support and 1.2 MB drive code (HD floppy controller still required).
 |-
-| Cassette port || Yes || '''No'''
+| 05/09/86 || U18=62X0890, U19=68X4370 (or 59X7268 / 62X0819) || 27256 EPROM || 360 KB and 720 KB || Final XT BIOS.
 |}
-== Architecture ==
+The 1986-dated BIOS revisions have two notable caveats: they may produce a specific symptom documented by minuszerodegrees.net, and they may not support an IBM 5161 expansion chassis.
-The 5160 uses the same support-chip family as the 5150: Intel 8088 CPU, optional 8087 FPU, 8259A interrupt controller, 8237A-5 DMA controller, 8253-5 timer, and 8255A-5 PPI.
+On the 1982-dated BIOS revisions, chip U19 contains part of Cassette BASIC and is not critical to operation. If the POST detects a failed U19, it displays "F6000 ROM" but continues booting. On the 1986-dated BIOS revisions U19 also contains part of the BIOS, so a failed U19 produces a 'dead' motherboard.
-== General Maintenance, Troubleshooting and Capacitor Replacement ==
+== Storage and Expansion ==
-The 5160 shares most of its maintenance and recap procedure with the [[IBM PC (5150)]]. For the +5 V and +12 V tantalum capacitor positions on the 5160 motherboard see minuszerodegrees.net's documented capacitor lists: on the 5160 motherboard, 13 of 16 tantalum capacitors sit on the +5 V line, while C56 (a tantalum) is the +12 V filter for the expansion slots and is well-known for going short-circuit. The 5160 will operate without C56.
+* '''Eight 8-bit ISA slots''' (compared to five on the 5150). The slots are at slightly narrower spacing than the 5150's, so some multi-board cards will not physically fit. Two slots (behind the hard drive cage) cannot accept full-length cards. Slot 8 has a special "slot 8 compatible" requirement — non-compatible cards in slot 8 generate an 1801 error at POST.
+* '''Floppy disk drive''' — one or two 5.25" 360 KB full-height drives (Tandon TM100-2 or equivalent). Later submodels switched to half-height drives.
+* '''Built-in hard drive''' — a 10 MB Seagate ST-412 with Xebec 1210 MFM controller was the standard configuration. Later submodels shipped with a 20 MB ST-225 half-height drive.
+* '''No cassette port''' (removed from the 5150 design).
+* '''Included Asynchronous Adapter''' — serial card with 8250 UART, standard on most submodels.
+* '''Optional IBM 5161 Expansion Unit''' — adds eight more ISA slots and room for two more full-height drives, connected via an Extender Card in the host and a Receiver Card in the 5161.
-== References ==
+== Display ==
+The XT has no on-board video; video is provided by an ISA adapter card driving a separate monitor:
+* '''[[IBM Monochrome Display Adapter|MDA]]''' + [[IBM 5151]] for 80×25 monochrome text.
+* '''[[IBM Color Graphics Adapter|CGA]]''' + [[IBM 5153]] for text and graphics.
+* From 1985, the '''EGA''' and the PGA became available as options.
+Submodel 5160-788 was the only XT sold with CGA as standard equipment.
+== Keyboard ==
+Most XTs shipped with the same '''[[IBM Model F (83-key)]]''' keyboard as the 5150, on a DIN-5 connector using the XT keyboard protocol. From 1986, submodels 268, 278, and 089 shipped with a 101-key Enhanced Keyboard variant (a Model M-style keyboard in a modified form that used the XT's keyboard protocol and lacked LEDs).
+== Power Supply ==
+A '''130 W''' power supply (compared to the 5150's 63.5 W / 130 W Type 1/2). XTs sold in the US were configured for 120 V only; international units shipped with switchable PSUs.
+== Submodels ==
+The XT was sold in many submodels. The following table is from the IBM Personal Computer Family Service Information Manual (January 1989, SA38-0037-00).
+{| class="wikitable styled-table" style="width:100%; text-align:center;"
+|+'''Selected IBM PC XT submodels'''
+! Submodel !! On-board RAM !! Floppy !! Hard disk !! Keyboard / notes
+|-
+| 5160-086 || 256 KB || 360 KB || 10 MB ||
+|-
+| 5160-087 || 128 KB || 360 KB || 10 MB ||
+|-
+| 5160-068 || 256 KB || 360 KB || none ||
+|-
+| 5160-078 || 256 KB || 2 × 360 KB || none ||
+|-
+| 5160-088 || 512 KB || 360 KB || 20 MB || Original Model F keyboard
+|-
+| 5160-089 || 512 KB || 360 KB || 20 MB || Enhanced (101-key) keyboard
+|-
+| 5160-267 || 256 KB || 360 KB || none || Original Model F keyboard
+|-
+| 5160-268 || 256 KB || 360 KB || none || Enhanced keyboard
+|-
+| 5160-277 || 256 KB || 2 × 360 KB || none || Original Model F keyboard
+|-
+| 5160-278 || 256 KB || 2 × 360 KB || none || Enhanced keyboard
+|-
+| 5160-788 || varies || 360 KB || 10 MB || CGA standard
+|-
+| 5160-568, -588, -589 || 256 KB || 360 KB || 0 or 10 MB || XT/370 — adds a System/370 co-processor board
+|-
+| 3270 PC (5271) || 256-384 KB || 360 KB || 0 or 10 MB || 3270 terminal emulation variant
+|-
+| 5162-286 (XT 286) || 640 KB || 1.2 MB HD || 20 MB || 6 MHz Intel 80286, 16-bit ISA, zero wait states
+|}
+== General Maintenance ==
+Cleaning procedures, PSU voltage checks, and preventive care for the XT are documented in [[IBM PC XT Maintenance Guide]].
+== Troubleshooting ==
+POST beep codes, parity errors, MFM hard drive faults and the XT-specific known problems (1801 slot-8 error, POST looping when SW1 bit 1 is ON, 1986-BIOS quirks) are documented in [[IBM PC XT Troubleshooting Guide]].
+== Capacitor Replacement ==
+The 5160 motherboard has 16 tantalum capacitors total: 13 on the +5 V line and 2 on the +12 V line (one of which is C56, a well-known short-circuit failure). The procedure and per-position photos are in [[IBM PC XT Capacitor Replacement Guide]].
-* [https://en.wikipedia.org/wiki/IBM_Personal_Computer_XT IBM Personal Computer XT — Wikipedia].
+== Gallery ==
-* [https://www.dosdays.co.uk/computers/IBM%20PC-XT%20(5160)/ibm5160.php IBM PC-XT (1983) — DOS Days].
+<gallery mode="packed" heights="200">
-* [https://minuszerodegrees.net/5150_5160/MDC/tantalum_short_plus_12volts.htm 5160 +12 V tantalum (C56) reference], minuszerodegrees.net.
+File:IBM PC XT 5160.jpg|IBM 5160 PC XT
+File:IBM 5160 motherboard 64-256KB silkscreen.jpg|Silkscreen marking for the early 64-256KB motherboard (minuszerodegrees.net)
+File:IBM 5160 motherboard 256-640KB silkscreen.jpg|Silkscreen marking for the late 256-640KB motherboard (minuszerodegrees.net)
+</gallery>
 == Related Pages ==
+* [[IBM PC XT Maintenance Guide]]
+* [[IBM PC XT Troubleshooting Guide]]
+* [[IBM PC XT Capacitor Replacement Guide]]
 * [[IBM PC (5150)]] — predecessor
+* IBM 5161 Expansion Unit
 * [[IBM Fixed Disk Adapter]]
 * [[IBM Model F (83-key)]]
+* [[IBM Monochrome Display Adapter]] / [[IBM Color Graphics Adapter]]
+== References ==
+* [https://en.wikipedia.org/wiki/IBM_Personal_Computer_XT IBM Personal Computer XT — Wikipedia]. Source for the submodel list, dimensions (19.5 × 16 × 5.5 in), weight (32 lb / 15 kg), and the relationship to the 5161 and XT 286.
+* [https://www.minuszerodegrees.net/5160/motherboard/5160_motherboard_revisions.htm IBM 5160 — Motherboard Versions], minuszerodegrees.net. Source for the 64-256KB / 256-640KB revision details.
+* [https://minuszerodegrees.net/5160/bios/5160_bios_revisions.htm IBM 5160 — BIOS Revisions], minuszerodegrees.net. Source for the four BIOS revisions, IBM part numbers, and floppy support details.
+* [https://www.dosdays.co.uk/computers/IBM%20PC-XT%20(5160)/ibm5160.php IBM PC-XT (1983) — DOS Days]. Reference for original configuration and chronology.
+* IBM, ''Personal Computer Family Service Information Manual'' (January 1989, document SA38-0037-00). Source for the submodel table.
+* IBM, ''Personal Computer Hardware Reference Library: Guide to Operations, Personal Computer XT'' (Part number 6936831, 1983).
 {{Navbox-IBMComputers|state=expanded}}
 [[Category:IBM]]

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