IBM PS/2 Model 53

IBM Personal System/2 (PS/2)

Company type	Division
Industry	Computer hardware
Predecessor	IBM PC
Founded	1987
Founder	International Business Machines Corporation (IBM)
Headquarters	Armonk , United States
Products	Personal computers, servers, laptops, notebooks, workstations
Parent	IBM

The Personal System/2 (PS/2) series, introduced by International Business Machines Corporation in 1987, marked the company's second wave of personal computers. This range succeeded the original IBM PC lineup, which was discontinued following the PS/2 launch. A majority of PS/2 units incorporated IBM's proprietary Micro Channel architecture (MCA) bus, a strategic move to reassert control over the PC industry. Nevertheless, certain entry-level variants continued to utilize the broadly supported ISA bus, which had been a staple in earlier IBM PCs and widely replicated by clone manufacturers due to its open design. The PS/2 family encompassed a variety of configurations including desktop systems, tower units, integrated all-in-one machines, portable computers, laptops, and notebooks.

Notes

Legend

Clarifications

• Models with IBM part numbers (P/N) designated for markets outside North America are not included.
• Monitors provided either built-in or as optional accessories are CRTs unless otherwise indicated.
• The Space Saving Keyboard is an 87-key version of the Model M keyboard lacking a numeric keypad.
• The Model 25 Collegiate was aimed at college students and featured dual 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.
• Certain financial workstation models came equipped with a 50-key function keypad tailored for banking software.
• LS ("LAN Stations") variants were diskless workstations without floppy or hard disks that connected through Ethernet or Token Ring adapters.
• Ultimedia models included built-in audio capabilities such as microphones, SCSI CD-ROM drives, M-Audio sound cards, volume controls, and front-panel headphone/microphone jacks.
• Array models functioned as PS/2 Servers supporting RAID storage configurations.

Primary Series

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IBM PS/2 model lineup

Model	IBM P/N	CPU	Clock speed (MHz)	Bus type	Number of slots	Number of drive bays	FDD	HDD	Default RAM	Maximum RAM	Graphics adapter	Monitor type	Chassis style	Release date	Additional info
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 included
25	8525-004	Intel 8086	8 (0 w)	ISA, 8-bit	2	2	one 720 KB	none	512 KB	640 KB	MCGA	12-inch color display	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-inch monochrome screen	All-in-one	Template:Date table sorting	Space Saving Keyboard included
IBM PS/2 Model 25 LS	8525-L01	Intel 8086	8 (0 w)	ISA, 8-bit	2	2	one 720 KB drive	none	512 KB	640 KB	MCGA	12-inch monochrome display	All-in-one	Template:Date table sorting	Supports Token Ring networking

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	Base RAM	Maximum RAM	Video adapter	Monitor	Form factor	Release date	Remarks
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	208 MB/212 MB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	Template:Date table sorting
Server 85	9585-0XD	Intel 486SX	33	MCA, 32-bit	8	7	single 2.88 MB	320 MB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	Template:Date table sorting

Portables

N51SX 8551-033 i386SX Intel386SX 16 style="background:#FFC"|Proprietary 2 (PC Card) unknown one1.44MB 40MB(IDE) 2MB 10MB Video Graphics Array/VGA Monochrome LCD Notebook unknown IBM PS/2 N51SLC N51SLC 8551-025 IBM386SLC IBM386SLC 16 style="background:#FFC"|Proprietary 2 (PC Card) unknown one1.44MB 80MB(IDE) 2MB 10MB Video Graphics Array/VGA Monochrome LCD Notebook unknown IBM PS/2 N33SX N33SX 8533-A33 i386SX Intel386SX 16 style="background:#FFC"|Proprietary 2 (PC Card) unknown one1.44MB 40MB(IDE) unknown unknown unknown Monochrome LCD Notebook unknown IBM PS/2 N33SX N33SX 8533-A35 i386SX Intel386SX 16 style="background:#FFC"|Proprietary 2 (PC Card) unknown one1.44MB 80MB(IDE) unknown unknown unknown Monochrome LCD Notebook unknown IBM PS/2 Model CL57 SX CL57 SX 8554-045 IBM386SLC IBM386SLC 16 style="background:#FFC"|Proprietary 2 (PC Card) unknown one1.44MB 80MB(IDE) 2MB 16MB Video Graphics Array/VGA Color TFT Laptop unknown

IBM PS/2 Portable Variants

Model	IBM P/N	CPU	Operating Frequency (MHz)	Bus Architecture	Expansion Slots Count	Drive Bays Count	FDD	HDD	Default RAM	Max RAM	Graphics Adapter	Display Type	Design Style	Launch 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	Includes slot for optional i387 math coprocessor
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	Supports optional i387 co-processor slot
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 slot for optional i387 math coprocessor
P75	8573-161	Intel 486	33	MCA, 32-bit	4 (two 16-bit, two 32-bit)	0	one 1.44 MB	160 MB (SCSI)	4 MB	16 MB	VGA	Monochrome gas plasma	Portable	Template:Date table sorting
P75	8573-401	Intel 486	33	MCA, 32-bit	4 (two 16-bit, two 32-bit)	0	one 1.44 MB	400 MB (SCSI)	4 MB	16 MB	VGA	Monochrome gas plasma	Portable	Template:Date table sorting
L40 SX	8543-A44	Intel 386SX	20	ISA,16-bit	0 (one with AT bus expansion port)	0	one1.44MB	60MB(IDE)	2MB	18MB	VGA	Monochrome LCD	Laptop	Template:Date table sorting |

Associated Systems

... (Similar entries for additional Academic System variants omitted for brevity, sharing comparable specifications and notes) ... (Additional entries for systems like IBM Clinical Workstation, EduQuest lineup, Industrial Computers, and Personal Typing Systems follow with condensed details)

IBM PS/2-Associated Models

Model	IBM P/N	CPU	Frequency (MHz)	Bus type	Slot count	Drive bays count	FDD	HDD	Default RAM	Max RAM	Graphics adapter	Display	Chassis type	Release date	Remarks
Academic System	6152-022	Intel 80286 ROMP 032	10 (286)	MCA, 16-bit	8	4	one 1.44 MB	20 MB (ST-506)	2 MB	8 MB	VGA	optional	Tower	Template:Date table sorting	Equipped with ROMP CPU on a daughterboard; cannot operate simultaneously with 286
Academic System	6152-024	Intel 80286 ROMP 032	10 (286)	MCA, 16-bit	8	4	one 1.44 MB	20 MB (ST-506)	4 MB	8 MB	VGA	optional	Tower	Template:Date table sorting	Features ROMP processor on daughterboard; not compatible for concurrent use with 286
Academic System	6152-044	Intel 80286 ROMP 032	10 (286)	MCA, 16-bit	8	4	one 1.44 MB	44 MB (ST-506)	4 MB	8 MB	VGA	optional	Tower	Template:Date table sorting	Includes ROMP CPU on daughterboard; cannot function simultaneously with the 286 processor
Academic System	6152-048	Intel 80286 ROMP 032	10 (286)	MCA, 16-bit	8	4	one 1.44 MB	44 MB (ST-506)	8 MB	8 MB	VGA	optional	Tower	Template:Date table sorting	Contains ROMP processor mounted on daughterboard; cannot operate in parallel with the Intel 286 CPU
Model	IBM P/N	CPU	Frequency (MHz)	Bus type	Slots	Drive bays	FDD	HDD	Default RAM	Maximum RAM	Graphics adapter	Display type	Form factor	Launch date	Additional information

See also

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