IBM PS/2 Model 40

IBM Personal System/2 (PS/2)

Company type	Product line
Industry	Personal computers
Founded	1987 (1987)
Founder	International Business Machines Corporation (IBM)
Headquarters	United States
Products	Personal computers (desktops, towers, all-in-ones, portables, laptops, notebooks)

The Personal System/2 (PS/2) represented a series of personal computers created by International Business Machines Corporation (IBM). Launched in 1987, the PS/2 marked IBM's second wave of personal computers, succeeding the initial IBM PC lineup, which was discontinued following the PS/2 introduction in April 1987. The majority of PS/2 units incorporated IBM's proprietary Micro Channel architecture bus, an effort to reassert control over the PC industry. Nonetheless, some entry-level configurations continued to utilize the commonly replicated ISA bus. The PS/2 range encompassed desktops, tower models, all-in-one systems, portable units, laptops, and notebooks.

Notes

Legend

Explanatory notes

• Models with IBM part numbers (P/N) designated for markets outside North America are not included.
• Unless specified otherwise, built-in or optional displays are CRT types.
• The Space Saving Keyboard is a version of the Model M featuring 87 keys and lacking a numeric keypad.
• The Model 25 Collegiate was designed for college students, equipped with dual 720 KB floppy drives, a maximum RAM capacity of 640 KB, and bundled with the official PS/2 Mouse, Windows 2.0, and blank floppy disks.
• Financial workstation variants came with a specialized 50-key function keypad tailored for banking tasks.
• LS ("LAN Station") models were diskless workstations lacking floppy or hard drives and connected through Ethernet or Token Ring adapters.
• Ultimedia models included features such as microphones, SCSI CD-ROM drives, M-Audio sound cards, volume controls, and front-panel headphone/microphone jacks.
• Array models served as PS/2 Servers equipped with RAID capabilities.

Main line

IBM PS/2 model lineup

Model	IBM P/N	Processor	Clock speed (MHz)	Bus	No. of slots	No. of drive bays	FDD	HDD	Stock RAM	Maximum RAM	Video adapter	Monitor	Form factor	Date introduced	Notes	Ref(s).
25	8525-001	Intel 8086	8 (0 w)	ISA, 8-bit	2	2	one 720 KB	none	512 KB	640 KB	MCGA	12-in. monochrome	All-in-one	Template:Date table sorting	Space Saving Keyboard
25	8525-004	Intel 8086	8 (0 w)	ISA, 8-bit	2	2	one 720 KB	none	512 KB	640 KB	MCGA	12-in. color	All-in-one	Template:Date table sorting	Space Saving Keyboard
IBM PS/2 Model 25 Collegiate	8525-C02	Intel 8086	8 (0 w)	ISA, 8-bit	2	2	two 720 KB	none	640 KB	640 KB	MCGA	12-in. monochrome	All-in-one	Template:Date table sorting	Space Saving Keyboard

30 Series || Various || Intel 8086 or Intel 80286 || 8–10 || ISA, 8/16-bit ||3||2||1–2 x720KB or1.44MB||0–30MB ST-506||512KB–1MB||4MB||MCGA or VGA||Optional||Desktop||1987–1991||Basic business PCs and financial workstation versions 35 Series || Various || Intel i386SX or IBM 386SLC ||20|| ISA,16-bit ||3||2||1 x1.44MB or none||0–80MB IDE/SCSI||2–4MB||4–16MB||VGA||Optional||Desktop||1991–1992||Supports Ethernet and Token Ring networking 40 Series || Various || Intel i386SX or IBM 386SLC ||20|| ISA,16-bit ||5||4||1 x1.44MB or none||0–80MB IDE/SCSI||2MB||16MB||VGA||Optional||Desktop||1991||Enhanced expansion slots with network capabilities 50 Series || Various || Intel 80286 ||10|| MCA,16-bit ||4||3||1 x1.44MB||20–60MB ST-506/ESDI||1–2MB||1–2MB||VGA||Optional||Desktop||1987–1988|| 55 Series || Various || Intel i386SX ||16|| MCA,16-bit ||3||2||None or1 x1.44MB||30–80MB ESDI/SCSI||2–4MB||8MB||VGA||Optional||Desktop/Tower/Diskless options available ||1990–1991|| 56 Series || Various || IBM486SLC/486SLC2/SLC3 ||50–75||| MCA,16-bit ||3–5|||1 x1.44MB or none|||0–540 MB SCSI/IDE|||4–8 MB|||16 MB|||XGA-2|||Optional|||Desktop|||1992–1994|||Includes Ethernet and Token Ring models; multimedia options available 57 Series || Various || IBM486SLC/486SLC2/SLC3 ||50–75||| MCA,16-bit ||5|||4|||One to two floppy drives; HDD up to540 MB SCSI|||4–8 MB|||16 MB|||XGA-2|||Optional|||Desktop|||1992–1994|||Ultimedia and multimedia versions offered; network options included 60 Series Tower || Various || Intel80286 ||10||| MCA,16-bit ||8|||4|||One floppy; up to70 MB ESDI HDD|||1–7 MB RAM|||VGA|||Optional monitor|||Tower case|||1987|| 65 SX Tower || Various || Intel i386SX ||16||| MCA,16-bit ||8|||4|||One floppy; up to320 MB SCSI HDD|||2–8 MB RAM|||VGA|||Optional monitor|||Tower case|||1990|| 70 Series Desktop || Various || Intel i386/i486DX/DX2/DX4 ||16–25 MHz|||| MCA,32-bit||||3 slots||||Up to320 MB ESDI HDD||||Up to6 MB RAM||||VGA||||Optional monitor||||Desktop||||1988–1991||||High-end models with advanced graphics and processing power 76 Series Desktop || Various || Intel i486SX/DX/DX2/DX4||||33–100 MHz|||| MCA,32-bit||||3 slots||||Up to270 MB SCSI/IDE HDD||||Up to64 MB RAM||||XGA-2||||Optional monitor||||Desktop||||1992–1994|| 77 Series Desktop||||Various i486 variants||||33–100 MHz|||| MCA,32-bit||||5 slots||||Up to540 MB SCSI/IDE HDD||||Up to64 MB RAM||||XGA-2 or S3 graphics options||||Optional monitor||||Desktop||||1992–1994|| 80 Series Tower||||Various i386 variants||||16–20 MHz|||| MCA,32-bit||||8 slots||||Up to314 MB ESDI/SCSI HDD||||Up to4 MB RAM||||VGA||||Optional monitor||||Tower case||||1987–1990|| 90 XP Series Desktop||||Various i486 variants||||20–50 MHz|||| MCA,32-bit||||4 slots||||Up to400 MB SCSI HDD||||Up to64 MB RAM||||XGA/XGA-2 graphics||||Optional monitor||||Desktop||||1990|| 95 XP Series Tower||||Various i486 variants||||20–50 MHz|||| MCA,32-bit||||7-8 slots||||Up to1 GB SCSI HDD||||Up to64 MB RAM||||XGA/XGA-2 graphics||||Optional monitor||||Tower case||||1990||

Model	IBM P/N	Processor	Clock speed (MHz)	Bus	Slots	Drive bays	FDD	HDD	Stock RAM	Max RAM	Video adapter	Monitor	Form factor	Date introduced	Notes
Selected IBM PS/2 Desktop Models

E Series Small Form Factor Desktop |9533 |IBM486SLC2 |50 |ISA,16-bit |4 PC Card slots |1 |One floppy |350 MB IDE or none |4 MB |16 MB |XGA-2 |CRT/LCD optional |Small form factor desktop |1993 |Compact design for business environments with optional Ethernet connectivity

Model	IBM P/N	Processor	Clock speed (MHz)	Bus	Slots	Drive bays	FDD	HDD	Stock RAM	Max RAM	Video adapter	Monitor	Form factor	Date introduced	Notes

PS/2 Server

IBM PS/2 Server variants

Model	IBM P/N	Processor	Clock speed (MHz)	Bus	Number of slots	Number of drive bays	FDD	HDD	Default RAM	Maximum RAM	Video adapter	Monitor	Form factor	Release date	Remarks
Server 85	9585-0X6	Intel 486SX	33	MCA, 32-bit	8	7	one 2.88 MB	104 MB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	Template:Date table sorting
Server 85	9585-0X9	Intel 486SX	33	MCA, 32-bit	8	7	one 2.88 MB	160 MB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	Template:Date table sorting
Server 85	9585-0XA	Intel 486SX	33	MCA, 32-bit	8	7	one 2.88 MB	208 MB/212 MB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	Template:Date table sorting

Model	IBM P/N	Processor	Clock MHz	Bus	Slots	Drive bays	FDD	HDD	Default RAM	Max RAM	Video adapter	Monitor	Form factor	Release date	Comments
Key PS/2 Server Models
Various Models (9595-3NG, -3NT, -3PG, -3PT, -3QG, -3QT) | Intel DX2 or Pentium | Up to 66 | MCA, 32-bit | Up to 9 | Up to 10 | One or two floppy drives (1.44 or 2.88 MB) | Up to three SCSI drives (540 MB to multiple GBs) | Up to16 MB | Up to256 MB | SVGA | Optional | Tower | Circa1993–1994 | Engineered for extensive storage with RAID support and hot-swappable drives, ideal for scalable and dependable enterprise systems.
Model9595-Z0x | Intel DX2 / Pentium |66 | MCA,32-bit |8 |7 |One2.88MB FDD |1GB SCSI HDD |8MB RAM default |256MB max RAM | SVGA video adapter | Optional monitor | Tower form factor | December1994 | Comes preloaded with IBM LAN Server or Novell NetWare, aimed at network-centric business environments.
Models8600-001,8600-002,8600-003 | Intel486 (single or dual processors) |33–50 MHz | Dual MCA,32-bit bus support on select models |12 slots max (Server295) /12 slots (Server195) |Up to10 drive bays (Server295/195) | One1.44MB FDD standard | SCSI HDD up to1GB per drive; supports hot-swapping and RAID-5 configurations | Default RAM ranges from32MB up to128MB max RAM; dual processors available depending on configuration. SVGA adapter; optional monitor. Tower design. Released mid-1992 through early1993. Built for demanding enterprise server workloads featuring advanced storage and processor options.

Portables

IBM PS/2 portable series

Model	IBM P/N	CPU	Clock speed (MHz)	Bus type	Number of slots	Number of drive bays	FDD	HDD	Base RAM	Maximum RAM	Graphics adapter	Display type	Design type	Release date	Remarks	Ref(s).
P70	8573-031	Intel 386	16	MCA, 32-bit	2, (one 16-bit, one 32-bit)	0	one 1.44 MB	30 MB (ESDI)	2 MB	8 MB	VGA	Monochrome gas plasma	Portable	Template:Date table sorting	Supports optional i387 math coprocessor slot
P70	8573-061	Intel 386	20	MCA, 32-bit	2 (one 16-bit, one 32-bit)	0	one 1.44 MB	60 MB (ESDI)	2 MB	8 MB	VGA	Monochrome gas plasma	Portable	Template:Date table sorting	Includes slot for optional i387 coprocessor
P70	8573-121	Intel 386	20	MCA, 32-bit	2 (one 16-bit, one 32-bit)	0	one 1.44 MB	120 MB (ESDI)	2 MB	8 MB	VGA	Monochrome gas plasma	Portable	Template:Date table sorting	Equipped with optional i387 coprocessor slot
P75	8573-161	Intel 486	33	[[Micro Channel architecture]|MCA]], 32-bit	4 (two 16-bit, two 32-bit)	0	one 1.44 MB	160 MB (SCSI)	4 MB	16 MB	Video Graphics Array	Monochrome gas plasma	Portable	Template:Date table sorting	'SCSI controller integrated on planar'

P/N:8554-045 Processor:IBM386SLC,16 MHz, Proprietary bus, Slots:2 (PC Card) Floppy disk drive: one1.44MB Hard disk drive:80MB (IDE) RAM capacity: base2MB, max16MB Graphics adapter:Video Graphics Array Screen: Color TFT Form factor:Laptop Launch date: unspecified Notes: none provided |

Related systems

... [Variants of Academic System with comparable specifications omitted for brevity] ... ... [Additional EduQuest models Thirty through Fifty-five summarized similarly] ... ... [Industrial computer models condensed to emphasize essential specifications and business context] ... Personal Typing System series (6901 models) and Personal Typing System/2 series (6907–6908) utilized Intel8086 or Intel80286 CPUs, incorporated ISA bus architectures, offered limited expansion capabilities, and were engineered as dedicated desktop solutions featuring word processing software and networking functionalities aimed at office applications from mid-1987 through late-1989.

IBM PS/2-associated systems

Model	IBM P/N	CPU	Operating frequency (MHz)	Bus architecture	Expansion slots count	Drive bays count	FDD	HDD	Base RAM	Maximum RAM	Graphics adapter	Display	Chassis type	Launch date	Remarks
Academic System	6152-022	Intel 80286 ROMP 032	10 (286)	MCA, 16-bit	8	4	single 1.44 MB	20 MB (ST-506)	2 MB	8 MB	VGA	optional	Tower	Template:Date table sorting	Equipped with ROMP processor on daughterboard; cannot operate concurrently with 286
Academic System	6152-024	Intel 80286 ROMP 032	10 (286)	MCA, 16-bit	8	4	single 1.44 MB	20 MB (ST-506)	4 MB	8 MB	VGA	optional	Tower	Template:Date table sorting	Features ROMP processor on add-on card; not usable simultaneously with 286 CPU
Academic System	6152-044	Intel 80286 ROMP 032	10 (286)	MCA, 16-bit	8	4	single 1.44 MB	44 MB (ST-506)	4 MB	8 MB	VGA	optional	Tower	Template:Date table sorting	Incorporates ROMP processor via daughter card; cannot function alongside the 286 processor
Academic System	6152-048	Intel 80286 ROMP 032	10 (286)	MCA, 16-bit	8	4	single 1.44 MB	44 MB (ST-506)	8 MB	8 MB	VGA	optional	Tower	Template:Date table sorting	Contains ROMP CPU on daughterboard; incompatible with simultaneous use of the 286 CPU
Clinical Workstation	7690	Intel 8086	8 (0 wait states)	Industry Standard Architecture (ISA), 8-bit	4	0	single 1.44 MB	none	640 KB	8 MB	Multi-Color Graphics Array (MCGA)	Monochrome LCD	Mobile workstation	Template:Date table sorting	Designed as a mobile healthcare workstation; intended to operate alongside IBM7496 Executive Workstation
EduQuest Thirty	9603	IBM386SLC	25	ISA,16-bit	4	2	single1.44 MB	30 MB (IDE)	1–4 MB	20 MB	Super VGA (SVGA)	14-inch color display	All-in-one design	Template:Date table sorting	Modified Model25 tailored for educational use, with optional sound card; later units lacked IBM branding
Executive Workstation	7496	Intel8086	8 (0 wait states)	ISA,8-bit	3	0	single720 KB	none	640 KB	640 KB	MCGA	Monochrome display	All-in-one unit	Template:Date table sorting	Specialized all-in-one system for healthcare settings; complements IBM7690 Clinical Workstation
GE Fanuc Workmaster II	7186	Intel386	16	MCA,32-bit	0	0	single1.44 MB	30 MB (ESDI)	2 MB	8 MB	VGA	Monochrome gas plasma screen	Portable form factor	Template:Date table sorting 1990 03  Industrial-grade PS/2 P70 variant marketed under GE Fanuc brand

See also

• List of third-party Micro Channel computers
• List of IBM Personal Computer models