IBM PS/2 Model 35 SLC

IBM Personal System/2 (PS/2)
Company type	Product line
Industry	Computer hardware
Founded	1987
Founder	International Business Machines Corporation (IBM)
Area served	Worldwide
Products	Personal computers (desktop, tower, all-in-one, portable, laptop, notebook)
Parent	International Business Machines Corporation (IBM)

Adapted from the English Wikipedia article IBM PS/2 Model 35 SLC, available under CC BY-SA 4.0Updated 9 August 2025

The Personal System/2 (PS/2) represented a series of personal computers created by International Business Machines Corporation (IBM). Launched in 1987, this lineup was IBM's follow-up to the original IBM PC range, which was discontinued upon the PS/2 release in April 1987. The majority of PS/2 units incorporated the proprietary Micro Channel architecture bus, IBM's strategy to reclaim dominance in the PC industry. Nonetheless, certain entry-level variants utilized the ISA bus, an open standard that was extensively replicated due to its backward compatibility with previous IBM PCs. The PS/2 collection comprised desktop systems, tower configurations, all-in-one units, portables, laptops, and notebooks.

Notes

Legend

Explanatory notes

Variants listed with IBM part numbers (P/N) for models distributed outside North America are omitted.
Unless otherwise noted, built-in or optional displays are CRT types.
The Space Saving Keyboard is a compact 87-key version of the Model M, lacking a numeric keypad.
The Model 25 Collegiate was aimed at college students and featured dual 720 KB floppy drives, up to 640 KB RAM, and came bundled with the official PS/2 Mouse, Windows 2.0, and blank floppy disks.
Financial workstation versions included a specialized 50-key function keypad tailored for banking tasks.
LS models ("LAN Stations") were diskless workstations without floppy or hard drives, relying on connection through Ethernet or Token Ring adapters.
Ultimedia variants incorporated microphones, SCSI CD-ROM drives, M-Audio sound cards, volume controls, plus front-facing headphone and microphone jacks.
Array models functioned as PS/2 Servers equipped with RAID capabilities.

Main line

... [Similar entries for Model 25 variants omitted for brevity] ...

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	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 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
25 286	8525-006	Intel 80286	10 (1 w)	ISA, 16-bit	2	2	one 1.44 MB	none	1 MB	4 MB	VGA	12-in. color	All-in-one	Template:Date table sorting		... [Additional entries for other PS/2 Model ranges such as Models 30, 35, and 40 follow similar formats with key specifications maintained but redundant details excluded] ...
Prominent high-end configurations:
IBM PS/2 Model 70 386 series	Various	i386	Up to 25 MHz	Micro Channel architecture#MCA, 32-bit	Up to three slots	Up to three drive bays	One or two floppy drives (1.44 MB)	Hard drives ranging from 60 MB to more than160 MB (ESDI/SCSI)	RAM between1 MB and6 MB standard	Maximum RAM up to6 MB	Video Graphics Array (VGA) or superior	Optional displays available	Desktop form factor	Released in late ’80s to early ’90s	High-performance business desktops featuring MCA bus and advanced storage options. Ideal for enterprise use.
IBM PS/2 Model 80 series	Various	Processors from i386 up to Intel DX4 running at100 MHz	Up to five expansion slots (MCA)	Tower design with multiple drive bays (up to four)	Hard disk capacities ranging from approximately44 MB ST-506 to over300 MB ESDI/SCSI drives	RAM configurations from1 MB up to about64 MB maximum, supporting advanced graphics adapters like XGA-2 and S3 chipsets suited for multimedia business applications.	Introduced during mid ’80s through early ’90s
IBM PS/2 Model 56 and 57 SLC and SLC2 series	Various IBM CPUs (IBM 386SLC, IBM486SLC2) clocked up to75 MHz	MCA bus architecture, desktop form factor with optional Ethernet or Token Ring networking capabilities.	Engineered for business settings demanding greater processing power and network connectivity.
IBM PS/2 Model 53 and 56 486SLC2 series	Equipped with IBM486SLC2 processors up to50 MHz	MCA bus platform with desktop form factor	Enhanced graphics support including SVGA and XGA-2	Targeted at professional users seeking a balance of performance and expansion options.
IBM PS/2 Model 76 and 77 series	Intel i486SX/DX2/DX4 processors running up to100 MHz	MCA bus featuring multiple expansion slots	Desktop design offering advanced storage choices including IDE and SCSI drives	Supports high RAM capacities up to64 MB	Advanced graphics adapters such as XGA-2 and S3 designed for multimedia business environments
IBM PS/2 Model 90 XP and 95 XP series	Intel i486SX/DX processors operating at speeds up to50 MHz	MCA bus in tower format tailored for high-end business computing requirements	Supports large storage volumes (up to1 GB SCSI), extensive RAM capacity, and sophisticated graphics adapters

PS/2 Server

IBM PS/2 Server variants
Model	IBM P/N	CPU	Clock frequency (MHz)	Bus type	Number of slots	Number of drive bays	FDD	HDD	Base RAM	Maximum RAM	Graphics adapter	Display	Chassis type	Release date
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
Server 85	9585-0XD	Intel 486SX	33	MCA, 32-bit	8	7	one 2.88 MB	320 MB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	Template:Date table sorting

Model	IBM P/N	CPU	Clock frequency (MHz)	Bus type	Slots	Drive bays	FDD	HDD	Base RAM	Max RAM	Graphics adapter	Display	Chassis type	Release date
Server 85	9585-0XF	Intel 486SX	33	MCA,32-bit	8	7	one 2.88 MB	400 MB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	1992-09
Server 85	9585-0XG	Intel 486SX	33	MCA,32-bit	8	7	one 2.88 MB	540 MB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	1992-09
Server 85	9585-0XT	Intel 486SX	33	MCA,32-bit	8	7	one 2.88 MB	1 GB (SCSI)	8 MB	64 MB	SVGA	optional	Tower	1992-09
Server 85	9585-0KG	Intel 486	33	MCA,32-bit	8	7	one 2.88 MB	540 MB (SCSI)	8 MB	256 MB	SVGA	optional	Tower	1993-11
Server 85	9585-0KT	Intel 486	33	MCA,32-bit	8	7	one2.88MB	1 GB (SCSI)	8MB	256MB	SVGA	optional	Tower	1993-11
Server85	9585-0NG	Intel486DX2	66	MCA,32-bit	8	7	one2.88MB	540MB (SCSI)	8MB	256MB	SVGA	optional	Tower	1993-09
Server85	9585-0NT	Intel486DX2	66	MCA,32-bit	8	7	one2.88MB	1GB (SCSI)	8MB	256MB	SVGA	optional	Tower	1993-09

Model	IBM P/N	CPU	Clock frequency (MHz)	Bus type	Slots	Drive bays	FDD	HDD	Base RAM	Max RAM	Graphics adapter	Display	Chassis type
Server95 Array	9595-3NG	Intel486DX2	66	MCA,32-bit	8	9	one1.44MB	3×540MB (SCSI)	8MB	256MB	SVGA	optional	Tower
Server95 Array	9595-3NT	Intel486DX2	66	MCA,32-bit	8	9	one1.44MB	3×1GB (SCSI)	8MB	256MB	SVGA	optional	Tower
Premium Server95

IBM P/N	Processor(s)	Clock frequency (MHz)	Bus type	Slots	Drive bays	FDD	HDD	Base RAM	Max RAM	Graphics adapter	Display	Chassis type	Release date	Remarks
Server295	8600-001	Intel486 dual	33	MCA,32-bit dual	12	10	one1.44MB	400MB/1GB (SCSI)	32MB	128MB	SVGA	optional	Tower	1992-06	Supports up to28GB hot-swappable storage, RAID-5 compatible, dual processor optional
Server295	8600-002	Intel486 dual	50	MCA,32-bit dual	12	10	one1.44MB	400MB/1GB (SCSI)	32MB	128MB	SVGA	optional	Tower	1992-06	Supports up to28GB hot-swappable storage, RAID-5 compatible, dual processor optional
Server195	8600-003	2×Intel486 dual	50	MCA,32-bit dual	12	10	one1.44MB	400MB/1GB (SCSI)	32MB	128MB	SVGA	optional	Tower	1993-04	Supports up to28GB storage, RAID-5 compatible, dual processor standard

Portables

| IBM PS/2 N51SLC (N51SLC) 8551-025 IBM386SLC 16 style= "background:#FFC" Proprietary bus 2 (PC Card) slots \u221E (unknown) drive bays single1.44MB 80MB (IDE) hard disk 2MB base RAM 10MB maximum RAM VGA graphics adapter Monochrome LCD screen Notebook form factor Release date unknown IBM PS/2 N33SX (N33SX) 8533-A33 Intel386SX processor 16 MHz clock speed Proprietary bus system Two PC Card slots \u221E (unknown) drive bays Single floppy disk drive 40MB IDE hard drive RAM capacity unknown Monochrome LCD display Notebook design Date of introduction unknown IBM PS/2 N33SX (N33SX) 8533-A35 Intel386SX CPU 16 MHz clock frequency Proprietary bus architecture Two PC Card expansion slots \u221E (unknown) number of drive bays One floppy disk drive 80MB IDE hard disk capacity RAM details unavailable Monochrome LCD panel Notebook format Date introduced unknown IBM PS/2 Model CL57 SX (CL57 SX) 8554-045 Equipped with IBM386SLC processor Runs at 16 MHz Utilizes proprietary bus with PC Card slots Number of drive bays unspecified Includes one floppy disk drive 80MB IDE hard disk installed Standard RAM: 2MB, expandable to 16MB VGA video adapter included Color TFT display Laptop form factor Release date not specified

IBM PS/2 portable variants
Model	IBM P/N	CPU	Clock frequency (MHz)	Bus type	Number of slots	Number of drive bays	FDD	HDD	Base RAM	Maximum RAM	Graphics adapter	Display type	Form factor	Release date	Remarks
P70	8573-031	Intel 386	16	MCA, 32-bit	2, consisting of 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 an optional slot for i387 math co-processor
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	Equipped with an optional slot for i387 co-processor
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
P75	8573-161	Intel 486	33	MCA,32-bit	4(two16-bit,two32-bit)	0	single1.44MB	160MB(SCSI)	4MB	16MB	VGA	Monochromegasplasma display	Portable	Template:Date tablesorting
P75	8573-401	Intel 486	33	MCA,32-bit	4(two16-bit,two32-bit)	0	single1.44MB	400MB(SCSI)	4MB	16MB	VGA	Monochromegasplasma display	Portable	Template:Date tablesorting
L40 SX	8543-A44	Intel386SX	20	ISA,16-bit	0(1withATbusexpansionport)	0	single1.44MB	60MB(IDE)	2MB	18MB	VGA	Monochrome LCD	Laptop	Template:Date tablesorting
N51SX	8551-033	Intel386SX	16	Proprietary bus	2(PC Card)	\u221E (unknown) drive bays	single1.44MB	40MB(IDE)	2MB	10MB	Video Graphics Array (VGA) \| Monochrome LCD \| Notebook \| \u221E (unknown) \|

Associated Systems

... (additional Academic System variants with incremental storage and memory upgrades omitted for brevity) ...

IBM PS/2-Associated Models
Model	IBM Part Number	CPU	Frequency	Bus Type	Expansion Slots	Drive Bays	Floppy Drive	Base RAM	Standard RAM	Max RAM	Video Card	Display	Chassis Type	Launch Date	Remarks
Academic System	6152-022	Intel 80286 ROMP 032	10 MHz	MCA, 16-bit	8	4	one 1.44 MB floppy	20 MB	2 MB	8 MB	VGA	optional	Tower		Equipped with ROMP processor on a daughterboard; cannot operate simultaneously with the 286 CPU
Academic System	6152-024	Intel 80286 ROMP 032	10 MHz	MCA, 16-bit	8	4	one 1.44 MB floppy	20 MB	4 MB	8 MB	VGA	optional	Tower		ROMP processor installed on daughter card; not capable of concurrent operation with the 286 processor
Academic System	6152-044	Intel 80286 ROMP 032	10 MHz	MCA, 16-bit	8	4	one 1.44 MB floppy	44 MB	4 MB	8 MB	VGA	optional	Tower
Clinical Workstation	7690	Intel 8086	8 MHz (zero wait states)	Industry Standard Architecture (ISA), 8-bit	4	none	one 1.44 MB floppy	none	640 KB	up to 8 MB	Multi-Color Graphics Array (MCGA)	Monochrome LCD panel	Mobile workstation	Designed as a specialized portable workstation for medical environments; intended to operate alongside IBM Executive Workstation (7496)

EduQuest Thirty 9603 IBM 386SLC 25 style="background:#CFC" | ISA,16-bit 4 2 one1.44MB floppy 30MB IDE HDD 1–4 MB 20 MB Super VGA (SVGA) 14-inch color display All-in-one design 1993-03 Derived from Model 25 for educational use; optional audio card; later versions lack IBM logo EduQuest Forty 9604 Intel 486SX 25 ISA,16-bit 4 2 one1.44MB floppy 30MB IDE HDD 4MB 20MB SVGA 14-inch color All-in-one 1993-03 Similar to above EduQuest Fifty 9605 Intel486SX 25 ISA,16-bit 4 2 one1.44MB floppy 30MB IDE HDD 4MB 20MB SVGA 14-inch color All-in-one 1993-03 Same configuration as above EduQuest Thirty-cs 9606 Cyrix Cx486SLC2 25/50 ISA,16-bit 4 2 one1.44MB floppy unknown capacity unknown unknown SVGA 14-inch color All-in-one 1994 Education-focused variant with optional sound card EduQuest Fifty-cs 9608 Intel486DX2 33 ISA,16-bit 4 2 one1.44MB floppy unknown capacity unknown unknown SVGA 14-inch color All-in-one 1994 Same as above EduQuest Thirty-five 9613 Cyrix Cx486SLC2 25/50 ISA,16-bit 4 2 one1.44MB floppy 133/256/342MB IDE HDD 4MB unknown SVGA 14-inch color All-in-one 1994-09 Educational model with optional sound card; later units without IBM branding EduQuest Fifty-five 9615 Intel486 33–100 ISA,16-bit 4 2 one1.44MB floppy 170/360/540MB IDE HDD 4MB 64MB SVGA 14-inch color All-in-one 1994-09 Offered six processor configurations; targeted at education sector; optional audio capability EduQuest Forty-five 9614 Intel486DX2 50 or66 ISA,16-bit 4 2 one1.44MB floppy unknown capacity 4MB unknown SVGA 14-inch color All-in-one 1995-09 Educational variant; optional sound card Executive Workstation 7496 Intel8086 8 MHz (zero wait states) style="background:#FCC" | ISA,8-bit 3 none one720KB floppy none 640KB 640KB MCGA Monochrome display All-in-one 1989-09 Specifically designed all-in-one unit for medical applications; intended to complement Clinical Workstation (7690)

Model	IBM P/N	Processor	Clock (MHz)	Bus Type	Slots	Drive Bays	Floppy Drive	Hard Disk	RAM (stock)	RAM (max)	Video Adapter	Display Type	Form Factor	Release Date	Comments

GE Fanuc Workmaster II 7186 Intel386 16 MHz style="background:#CCF" | MCA,32-bit 0 expansion slots 0 drive bays one1.44MB floppy 30MB ESDI hard disk 2MB base RAM 8MB maximum RAM VGA graphics Monochrome gas plasma display Portable form factor 1990-03 Industrial-grade PS/2 variant branded by General Electric Fanuc

Industrial Computer lineup (key models): 7552-040 / -140: Intel80286, hybrid bus combining ISA and undocumented MCA; rugged modular rackmount design introduced Micro Channel architecture prior to PS/2 debut in April 1987 7541 /7542: Intel80286, MCA bus-based benchtop and rackmount rugged industrial PS/2 systems featuring VGA graphics and ESDI drives 7561 /7562: Intel386, MCA bus benchtop and rackmount industrial PS/2 machines with VGA and ESDI storage 7546: Intel386SX, MCA bus benchtop/rackmount rugged PS/2 supporting SCSI interfaces 7568 series ("Gearbox"): Intel386 and i486 models combining MCA and ISA buses in modular rackmount rugged chassis supporting VGA and ESDI/SCSI storage These industrial computers were engineered for factory and harsh environment applications requiring durable hardware with modular expandability and advanced bus architectures.

Personal Typing System series: specialized versions of Model 30 tailored for word processing and networked office use aimed at business professionals requiring dedicated typing platforms; utilized Intel8086 at 8 MHz with ISA bus and MCGA graphics; offered multiple floppy drive configurations plus optional hard disks for document management; launched between mid-late '80s into early '90s. Significant models include:

Personal Typing System (6901 series)
Personal Typing System/2 (6907)
Personal Typing System/2 286 (6908), featuring Intel80286 at10 MHz with VGA output.

These systems supported integration with IBM Wheelwriter and Quietwriter devices enhancing office productivity.

References