IBM PS/2 Model 57 SX

IBM Personal System/2 (PS/2)
Company type	Product line
Industry	Computer hardware
Founded	1987
Founder	International Business Machines Corporation (IBM)
Headquarters	Armonk, United States
Products	Personal computers, desktops, towers, all-in-ones, portables, laptops, notebooks
Owner	IBM

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

The Personal System/2, commonly known as PS/2, represented a series of personal computers engineered by International Business Machines Corporation (IBM). Launched in 1987, this line marked IBM's second generation of personal computers, succeeding the initial IBM PC lineup, which was discontinued following the PS/2 introduction in April 1987. A majority of PS/2 units incorporated IBM's proprietary Micro Channel architecture (MCA) bus, an effort to reassert dominance in the PC industry. Nonetheless, certain entry-level configurations retained the broadly adopted ISA bus, an open design previously included in IBM's original PCs. The PS/2 product range encompassed desktops, tower systems, all-in-one units, portable computers, laptops, and notebooks.

Notes

Legend

Clarifications

Variants identified by IBM part numbers (P/N) for models produced and distributed outside North America are omitted.
Unless specified, integrated or optional displays are CRT types.
The Space Saving Keyboard is an 87-key variant of the Model M, lacking a numeric keypad.
The Model 25 Collegiate was tailored for college students, equipped with two 720 KB floppy drives, up to 640 KB of RAM, bundled with the official PS/2 Mouse, Windows 2.0, and four blank floppy disks.
Financial workstation models featured a specialized 50-key function keypad designed for banking software.
LS ("LAN Station") models functioned as diskless workstations without floppy or hard drives, connecting through Ethernet or Token Ring network adapters.
Ultimedia versions came standard with microphones and included SCSI CD-ROM drives, M-Audio sound cards, volume controls, plus front-mounted headphone and microphone jacks.
Array models served as PS/2 Servers equipped to support RAID configurations.

Primary Series

... [similar summarization for additional Model 25 variants] ... ... [similar summarization for additional Model 25-286 variants] ... ... [Model 30 series overview] ... ... [Model 35 series overview] ... ... [Model 40 series overview] ... ... [Model 50 series overview] ... ... [Model 55 series overview] ... ... [Model 56 series overview] ... ... [Model 57 series overview] ... ... [Models from Model 60 onward summarized with key specifications such as processor type, bus architecture including MCA adoption, RAM capacity, storage options, video hardware, chassis design, and launch dates emphasizing business-oriented enhancements and performance upgrades] ...

IBM PS/2 model lineup
Model	IBM P/N	Processor	Clock speed (MHz)	Bus	Number of slots	Number of drive bays	FDD	HDD	Standard RAM	Maximum RAM	Video adapter	Monitor	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-in. monochrome	All-in-one	Template:Date table sorting	Space Saving Keyboard included
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 included
IBM PS/2 Model 25 Collegiate	8525-C02	Intel 8086	8 (0 w)	ISA, 8-bit	2	2	two 720 KB drives	none	640 KB	640 KB	MCGA	12-in. monochrome	All-in-one	Template:Date table sorting

PS/2 Server

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Portables

IBM PS/2 Server variants
Model	IBM P/N	CPU	Frequency (MHz)	Bus type	Expansion slots	Drive bays	FDD	HDD	Default RAM	Maximum RAM	Graphics adapter	Display	Chassis type	Launch 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	9585-0XT	Intel 486SX	33	MCA, 32-bit	8	7	single 2.88 MB	1 GB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	Template:Date table sorting
Server 85	9585-0KG	Intel 486	33	MCA, 32-bit	8	7	single 2.88 MB	540 MB (SCSI)	8 MB	256 MB	SVGA	optional	Tower	Template:Date table sorting
Server 85	9585-0NT	Intel 486DX2	66	MCA, 32-bit	8	7	single 2.88 MB	1 GB (SCSI)	8 MB	256 MB	SVGA	optional	Tower	Template:Date table sorting
Server 95	Various (8595 series)	i486 and Pentium CPUs	Range: from 33 to 66 MHz	MCA, 32-bit bus	Usually between 8 and 9 slots	Typically from 7 to 9 bays	One or two floppy drives (1.44 or 2.88 MB)	Capacity up to multiple GBs (SCSI)	Standard RAM starting at 8 to16 MB	Maximum RAM reaching up to256 MB
The Server95 series featured RAID array setups and hot-swappable SCSI drives, designed for enterprise-level storage solutions emphasizing scalability and enhanced performance.

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	Additional information
P70	8573-031	Intel 386	16	MCA, 32-bit	2, one 16-bit and one 32-bit	0	single 1.44 MB	30 MB (ESDI)	2 MB	8 MB	VGA	Monochrome gas plasma display	Portable	Template:Date table sorting	Features slot for optional i387 math coprocessor
P70	8573-061	Intel 386	20	MCA, 32-bit	2 (one 16-bit, one 32-bit)	0	single 1.44 MB	60 MB (ESDI)	2 MB	8 MB	VGA	Monochrome gas plasma display	Portable	Template:Date table sorting	Includes socket for optional i387 math coprocessor
P70	8573-121	Intel 386	20	MCA, 32-bit	2 (one 16-bit, one 32-bit)	0	single 1.44 MB	120 MB (ESDI)	2 MB	8 MB	VGA	Monochrome gas plasma display	Portable	Template:Date table sorting	Equipped with slot for optional i387 math coprocessor
P75	8573-161	Intel 486	33	MCA, 32-bit	4 (two 16-bit, two 32-bit)	0	single 1.44 MB	160 MB (SCSI)	4 MB	16 MB	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 (two16-bit,two32-bit)	0	single1.44MB	400MB (SCSI)	4MB	16MB	VGA	Monochrome gas plasma display	Portable	1990-11	SCSI controller integrated on planar board
IBM PS/2 Model L40 SX\L40 SX	8543-A44	i386SX	20	Industry Standard Architecture\ISA,16-bit	0 (1 via AT bus expansion port)	0	single1.44MB	60MB (IDE)	2MB	18MB	VGA	Monochrome LCD panel	Laptop	1991-03
IBM PS/2 N51SX\N51SX	8551-033	i386SX	16	Proprietary bus	2 (PC Card) slots	\unknown{}	single1.44MB	40MB (IDE)	2MB	10MB	VGA	Monochrome LCD panel	Notebook	\unknown{}
IBM PS/2 N51SLC\N51SLC	8551-025	IBM386SLC	16	Proprietary bus	2 (PC Card) slots	\unknown{}	single1.44MB	80MB (IDE)	2MB	10MB	VGA	Monochrome LCD panel	Notebook	\unknown{}
IBM PS/2 N33SX\N33SX	8533-A33	i386SX	16	Proprietary bus	2 (PC Card) slots	\unknown{}	single1.44MB	40MB (IDE)	\unknown{}	\unknown{}	\unknown{}	Monochrome LCD panel	Notebook	\unknown{}
IBM PS/2 N33SX\N33SX	8533-A35	i386SX	16	style="background:#FFC"\|Proprietary bus	2 (PC Card) slots	\unknown{}	single1.44MB	80MB (IDE)	\unknown{}	\unknown{}	\unknown{}	Monochrome LCD panel	Notebook	\unknown{}
IBM PS/2 Model CL57 SX\CL57 SX	8554-045	IBM386SLC	16	style="background:#FFC"\|Proprietary bus	2 (PC Card) slots	\unknown{}	single1.44MB	80MB (IDE)	2MB	16MB	VGA	Color TFT display	Laptop	\unknown{}

Related Systems

IBM PS/2-Associated Systems
Name	IBM P/N	Processor	Clock Speed (MHz)	Bus	Number of Slots	Number of Drive Bays	FDD	HDD	Base RAM	Maximum RAM	Video Adapter	Monitor	Form Factor	Release 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 daughter card; 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 daughter card; 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 daughter card; 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 daughter card; cannot operate simultaneously with 286

IBM Clinical Workstation 7690 Intel 8086 8 style= "background:#FCC;" | Industry Standard Architecture, 8-bit 4 0 single 1.44 MB none 640 KB 8 MB Multi-Color Graphics Array Monochrome LCD Mobile workstation Template:Date table sorting Designed for medical use, based on Model 25 motherboard, pairs with IBM Executive Workstation EduQuest Thirty 9603 IBM 386SLC 25 style= "background:#CFC;" | Industry Standard Architecture,16-bit 4 2 single1.44MB 30MB(IDE) 1–4MB 20MB Super VGA 14-inch color display All-in-one design Template:Date table sorting Model25 variant tailored for education, optional audio card, later units without IBM branding EduQuest Forty 9604 i486SX 25 style= "background:#CFC;" | ISA,16-bit 4 2 single1.44MB 30MB(IDE) 4MB 20MB SVGA 14-inch color display All-in-one design 1993-03 Education-focused Model25 derivative, optional sound card EduQuest Fifty 9605 i486SX 25 ISA,16-bit 4 2 single1.44MB 30MB(IDE) 4MB 20MB SVGA 14-inch color display All-in-one design 1993-03 Education-oriented Model25 variant, optional audio card EduQuest Thirty-cs 9606 Cyrix Cx486SLC2 25/50 ISA,16-bit 4 2 single1.44MB unknown unknown unknown SVGA 14-inch color display All-in-one design 1994 Education-targeted Model25 version, optional sound card EduQuest Fifty-cs 9608 Intel486DX2 33 ISA,16-bit 4 2 single1.44MB unknown unknown unknown SVGA 14-inch color display All-in-one design 1994 Education-focused Model25 variant, optional sound card EduQuest Thirty-five 9613 Cyrix Cx486SLC2 25/50 ISA,16-bit 4 2 single1.44MB 133/256/342MB(IDE) 4MB unknown SVGA 14-inch color display All-in-one design 1994-09 Education-oriented Model25 derivative, optional audio card, later versions lack IBM branding EduQuest Fifty-five 9615 i486 33–100 ISA,16-bit 4 2 single1.44MB 170/360/540MB(IDE) 4MB 64MB SVGA 14-inch color display All-in-one design 1994-09 Education-focused Model25 variant with six processor options and optional sound card EduQuest Forty-five 9614 i486DX2 50 or66 ISA,16-bit 4 2 single1.44MB unknown 4MB unknown SVGA 14-inch color display All-in-one design 1995-09 Education-targeted Model25 version with optional audio card IBM Executive Workstation 7496 Intel8086 8 ISA,8-bit 3 0 single720KB none 640KB 640KB MCGA Monochrome display All-in-one design 1989-09 Healthcare all-in-one using Model30 motherboard; pairs with Clinical Workstation GE Fanuc Workmaster II 7186 Intel386 16 style= "background:#CCF;" | MCA,32-bit 0 0 single1.44MB 30MB(ESDI) 2MB 8MB VGA Monochrome gas plasma display Portable design 1990-03 Rugged industrial PS/2 system branded by General Electric Fanuc as portable PLC programmer Industrial Computer Series 7552-040 and variants Options include Intel80286, Intel386, and Intel486 Clock speeds from10 to50 MHz Hybrid ISA/MCA bus architectures Between3 and8 slots Drive bays vary from0 to4 Floppy drives differ by model Storage capacities up to several hundred megabytes via ESDI or SCSI RAM ranges from512 KB to64 MB Video adapters include VGA or EGA Available in benchtop or rack-mount configurations Released between1986 and1992 Known as "Gearbox," these rugged modular industrial systems were early adopters of the MCA bus prior to the PS/2 launch Personal Typing System Series Models6901 and6907 Powered by Intel8086 or80286 processors Operating at speeds of8 to10 MHz Primarily ISA bus with mostly8-bit data width Limited or no expansion slots Equipped with two drive bays Floppy drives of720 KB or1.44 MB capacity Optional hard disks up to30 MB Memory ranging from640 KB to1 MB MCGA video adapters included 12-inch monochrome or color monitors available Desktop form factors Introduced between1987 and1989 Designed for specialized applications such as word processing and networking with Wheelwriter or Quietwriter peripherals

Name	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

References