IBM PS/2 Model 57 SLC

IBM Personal System/2 (PS/2)
Company type	Product line
Industry	Personal computers
Predecessor	IBM PC family
Founded	1987
Founder	International Business Machines Corporation (IBM)
Fate	Succeeded original IBM PC family
Successor	None
Headquarters	United States
Area served	Worldwide
Products	Personal computers (desktops, towers, all-in-one, portable, laptop, notebook)
Owner	IBM
Parent	International Business Machines Corporation

Adapted from the English Wikipedia article IBM PS/2 Model 57 SLC, available under CC BY-SA 4.0Updated 9 August 2025

The Personal System/2 (PS/2), developed by International Business Machines Corporation (IBM), was a series of personal computers introduced in 1987. This lineup represented IBM's second generation of personal computers, succeeding the original IBM PC family, which was discontinued following the PS/2 launch. The majority of PS/2 units incorporated IBM's proprietary Micro Channel architecture bus, an initiative aimed at reestablishing control over the PC industry. Nevertheless, certain entry-level variants continued to use the broadly adopted ISA bus, an open standard prevalent in earlier IBM PCs. The PS/2 range encompassed various form factors, including desktops, tower systems, all-in-one units, as well as portable, laptop, and notebook models.

Notes

Legend

Clarifications

Variants identified by IBM part numbers (P/N) for sales outside North America are not listed.
Unless specified otherwise, built-in or optional displays are CRT monitors.
The Space Saving Keyboard is a compact 87-key version of the Model M keyboard that excludes the numeric keypad.
The Model 25 Collegiate was designed for university students and featured dual 720 KB floppy drives, up to 640 KB of RAM, included the official PS/2 Mouse, Windows 2.0 software, and four blank floppy disks.
Financial workstation models incorporated a 50-key function keypad tailored for banking tasks.
LS ("LAN Station") models were diskless workstations without floppy or hard drives, connecting through Ethernet or Token Ring network adapters.
Ultimedia versions were equipped with a microphone, SCSI CD-ROM drives, M-Audio sound cards, volume controls, and front-facing headphone and microphone jacks.
Array models functioned as PS/2 Servers with support for RAID configurations.

Primary Series

IBM PS/2 model lineup
Model	IBM P/N	CPU	Clock speed (MHz)	Bus type	Expansion slots	Drive bays	FDD	HDD	Default RAM	Maximum RAM	Graphics adapter	Display	Form factor	Release date	Remarks
25	8525-001	Intel 8086	8 (0 w)	ISA, 8-bit	2	2	one 720 KB	none	512 KB	640 KB	MCGA	12-inch 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	Multi-Color Graphics Array (MCGA)	12-inch 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	Multi-Color Graphics Array (MCGA)	12-inch monochrome	All-in-one	Template:Date table sorting	Space Saving Keyboard
IBM PS/2 Model 25 LS	8525-L01	Intel 8086	8 (0 w)	ISA, 8-bit	2	2	one 720 KB	none	512 KB	640 KB	Multi-Color Graphics Array	12-inch monochrome	All-in-one	Template:Date table sorting	'Token Ring'

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
Server 85	9585-0X6	Intel 486SX	33	MCA, 32-bit	8	7	single 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	single 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	single 2.88 MB	approximately 210 MB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	Template:Date table sorting

Model	IBM P/N	Processor	Clock speed (MHz)	Bus	Slots	Drive bays	FDD	HDD	Default RAM	Max RAM	Video adapter	Monitor	Form factor	Release date	Remarks
Multiple \| Intel i486SX/i486/i486DX2/Intel Pentium \| Between 33 and 66 \| MCA, 32-bit \| Ranges from 7 to 9 \| Up to 10 \| One floppy (1.44 or 2.88 MB) \| SCSI drives from 104 MB up to multi-gigabyte capacities \| Default RAM from 8 MB to16 MB; maximum RAM up to256 MB \| SVGA \| Optional \| Tower \| Released between1992 and1994 \| Incorporates Micro Channel Architecture, SCSI storage options, and optional SVGA displays. Certain models support RAID and hot-swappable drives.
IBM P/N:8600-001,8600-002 \| Intel i486 (dual processors optional) \| Either33 or50 MHz \| MCA, dual,32-bit \| Up to12 slots \| Up to10 bays \| One floppy (1.44 MB) \| SCSI drives up to1 GB, hot-swappable, RAID-5 compatible; supports only IBM disks \| Default RAM:32 MB; Max RAM:128 MB \| SVGA \| Optional \| Tower \| Launched June1992 \| Engineered for high availability featuring dual processors and hot-swappable storage supporting up to28 GB.
IBM P/N:8600-003 \| Dual Intel i486 processors \|50 MHz \| MCA, dual,32-bit \|12 slots \|10 bays \| One floppy (1.44 MB) \| SCSI drives up to1 GB, RAID-5 compatible; IBM disks only supported \| Default RAM:32 MB; Max RAM:128 MB \| SVGA \| Optional \| Tower \| Released April1993 \| Dual processor configuration standard for improved performance and reliability.

Portables

IBM PS/2 P70 IBM PS/2 P70 IBM PS/2 P75

IBM PS/2 portable computers
Model	IBM P/N	Processor	Clock speed (MHz)	Bus	Number of slots	Number of drive bays	FDD	HDD	Default RAM	Maximum RAM	Video adapter	Display type	Form factor	Release date	Remarks
P70	8573-031	Intel 386	16	Micro Channel architecture (MCA), 32-bit	Two slots: one16-bit, one32-bit	None	single1.44 MB floppy drive	30 MB (ESDI)	2 MB	Up to8 MB	Video Graphics Array (VGA)	Monochrome gas plasma display	Portable unit	Template:Date table sorting	Includes slot for optional i387 math co-processor
8573-061	i386	20	style="background:#CCF"\|Micro Channel architecture,32-bit	2 slots (one16-bit, one32-bit)	0	single1.44MB floppy	60MB (ESDI)	2MB	8MB	Video Graphics Array (VGA)	Monochrome gas plasma display	Portable	Template:Date table sorting	Includes slot for optional i387 co-processor
8573-121	i386	20	style="background:#CCF"\|Micro Channel architecture,32-bit	2 slots (one16-bit, one32-bit)	0	single1.44MB floppy	120MB (ESDI)	2MB	8MB	Video Graphics Array (VGA)	Monochrome gas plasma display	Portable	Template:Date table sorting	Includes slot for optional i387 co-processor
8573-161	i486	33	style="background:#CCF"\|Micro Channel architecture,32-bit	4 slots (two16-bit, two32-bit)	0	single1.44MB floppy	160MB (SCSI)	4MB	16MB	Video Graphics Array (VGA)	Monochrome gas plasma display	Portable	Template:Date table sorting	Integrated SCSI controller on planar board

|- P75 ||8573-401 ||i486 ||33 ||MCA,32-bit ||4 slots (two16-bit,two32-bit)||0 ||one1.44MB floppy ||400MB (SCSI)||4MB ||16MB ||VGA ||Monochrome gas plasma ||Portable || SCSI controller integrated on planar board || |- IBM PS/2 Model L40 SX ||8543-A44 ||i386SX ||20 ||ISA,16-bit ||0 (one with AT bus expansion port)||0 ||one1.44MB floppy ||60MB (IDE)||2MB ||18MB ||VGA ||Monochrome LCD ||Laptop || |- IBM PS/2 N51SX ||8551-033 ||i386SX ||16 ||Proprietary bus ||2 PC Card slots ||one1.44MB floppy ||40MB (IDE)||2MB ||10MB ||VGA ||Monochrome LCD ||Notebook || |- IBM PS/2 N51SLC ||8551-025 ||16 MHz processor ||Proprietary bus system ||2 PC Card slots ||one1.44MB floppy drive ||80MB IDE hard disk drive ||2MB RAM stock ||10MB max RAM capacity ||VGA video adapter ||Monochrome LCD screen ||Notebook form factor || |- IBM PS/2 N33SX ||8533-A3316 ||16 MHz processor unknown specifics ||Proprietary bus system with two PC Card slots unknown details on drive bays and memory capacities except one1.44MB floppy and unknown HDD size and RAM capacities with monochrome LCD display in notebook format unknown release date || |- IBM PS/2 N33SX ||8533-A35 ||i386SX processor at16 MHz unknown bus type with two PC Card slots zero known drive bays except one1.44MB floppy unknown hard disk size with unknown RAM capacities monochrome LCD display in notebook form factor release date unknown || |- IBM PS/2 Model CL57 SX ||8554-045 ||IBM386SLC processor at16 MHz proprietary bus with two PC Card slots unknown number of drive bays one1.44MB floppy hard disk size80MB IDE default RAM of2MB max RAM16MB VGA video output color TFT display laptop form factor release date unknown || |}

Associated Systems

IBM PS/2-associated models
Model	IBM P/N	CPU	Operating frequency (MHz)	Bus type	Number of expansion slots	Number of drive bays	FDD	HDD	Installed 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	ROMP CPU on daughterboard; cannot operate simultaneously 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	ROMP CPU on daughterboard; cannot operate simultaneously with 286
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	ROMP CPU on daughterboard; cannot operate simultaneously with 286
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	ROMP CPU on daughterboard; cannot operate simultaneously with 286

7552-040, 7552-140, 7541, 7542, 7561, 7562, 7546, 7568-040, 7568-150, 7568-C40, 7568-D40 || Various Intel CPUs from Intel80286 through Intel486DX2 || 10–50 MHz || Hybrid MCA and ISA buses (primarily MCA) || 3–8 slots || 3–4 drive bays || One or no floppy drives || Up to320/400 MB SCSI or ESDI hard drives || 512 KB to8 MB RAM installed || Up to16 MB maximum RAM || VGA or EGA graphics cards || Optional monitors available || Benchtop, rack mount or portable configurations || 1986–1992 || Durable modular industrial computers known for early adoption of Micro Channel architecture prior to PS/2 launch |- | Personal Typing System Series || 6901-001 to6901-006, 6907, 6908 || Intel8086 or Intel80286 || 8–10 MHz || ISA, mostly8-bit except model6908 which is16-bit|| 0–2 expansion slots|| Two drive bays|| One or two floppy drives (720 KB or1.44 MB)|| None or optional20–30 MB hard disks|| 640 KB to1 MB RAM installed|| 640 KB to1 MB maximum RAM|| MCGA graphics adapter|| 12-inch monochrome or color displays|| Desktop case design|| 1987–1989|| Customized Model30 systems optimized for word processing and networking applications; featured Wheelwriter and Quietwriter options; targeted at business users requiring dedicated typing solutions.

References