IBM PS/2 Model 56 LS
| Company type | Product line |
|---|---|
| Industry | Personal computers |
| Predecessor | IBM PC |
| Founded | 1987 |
| Founder | International Business Machines Corporation (IBM) |
| Headquarters | Armonk , United States |
Area served | Worldwide |
| Products | Desktop computers, tower units, all-in-one systems, portable machines, laptops, notebooks |
| Owner | IBM |
The Personal System/2 (PS/2) was a series of personal computers created by International Business Machines Corporation (IBM). Introduced in 1987, the PS/2 represented IBM's second generation of personal computing devices, following the original IBM PC lineup, which was discontinued upon the PS/2's release. The majority of PS/2 units incorporated IBM's proprietary Micro Channel architecture (MCA) bus, an initiative aimed at reestablishing IBM’s dominance in the PC market. Nonetheless, some entry-level PS/2 models maintained compatibility with the commonly replicated Industry Standard Architecture (ISA) bus found in earlier systems. The PS/2 family encompassed various configurations, including desktops, tower units, all-in-one systems, portable machines, laptops, and notebooks.
Notes
- Legend
- Explanatory notes
- Models with IBM part numbers designated for sales outside North America are not included.
- Unless specified otherwise, integrated or optional displays are cathode-ray tube (CRT) monitors.
- The Space Saving Keyboard is a compact 87-key version of the Model M, omitting 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, and came bundled with the official PS/2 Mouse, Windows 2.0, and blank floppy disks.
- Financial workstation variants were equipped with a 50-key function keypad tailored for banking software.
- LS ("LAN Stations") models operated as diskless workstations without floppy or hard drives, connecting through Ethernet or Token Ring network adapters.
- Ultimedia configurations included microphones, SCSI CD-ROM drives, M-Audio sound cards, volume control knobs, and front panel headphone/microphone ports.
- Array models served as PS/2 Servers with support for RAID setups.
Primary Series
| Model | IBM P/N | CPU | Clock Speed (MHz) |
Bus Type | Expansion Slots | Drive Bays | FDD | HDD | Default RAM | Max RAM | Video Adapter | Monitor | Chassis Type | 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-inch monochrome | All-in-one | Template:Date table sorting | Space Saving Keyboard included | ||||||||||||||
| 25 SX | 8525-K00 | Intel 386SX | 20 | ISA, 16-bit | 3 | 2 | one 1.44 MB | none | 1 MB | 16 MB | VGA | 12-inch color | All-in-one | Template:Date table sorting | |||||||||||||||
| 30 286 | 8530-E01 | Intel 80286 | 10 (1 w) | ISA, 16-bit | 3 | 2 | one 1.44 MB | none | 512 KB | 4 MB | VGA | optional | Desktop | Template:Date table sorting | |||||||||||||||
| 35 SLC | 8535-050 | IBM 386SLC | 20 (0 w ) | ISA,16-bit | 3 | 2 | one 2.88 MB | none | 2 MB | 16 MB | VGA | optional | Desktop | Template:Date table sorting | |||||||||||||||
| 40 SX | 8540-040 | Intel 386SX | 20 (0–2 w ) | ISA,16-bit | 5 | 4 | one 1.44 MB | none | 2 MB | 16 MB | VGA | optional | Desktop | Template:Date table sorting | |||||||||||||||
| IBM PS/2 Model 50 Z | 8550-031 | Intel 80286 | 10 (0 w ) | MCA,16-bit | 4 | 3 | one 1.44 MB | 30 MB (ST-506) | 1 MB | 2 MB | VGA | optional | Desktop | Template:Date table sorting | |||||||||||||||
| IBM PS/2 Model 55 SX | 8555-031 | i386SX | 16 (0–2 w) | style="background:#CEF"| MCA,16-bit | 3 | 2 | one1.44MB | 30MB ESDI | 2MB | 8MB | VGA | optional | Desktop | 1989-05 | |||||||||||||||
| IBM PS/2 Model 56 SX | 8556-043 | i386SX | 20 | style="background:#CEF"| MCA,16-bit | 3 | 2 | one2.88MB | 40MB SCSI | 4MB | 8MB | XGA-2 | optional | Desktop | 1991-10 | |||||||||||||||
| IBM PS/2 Model 57 SX | 8557-045 | i386SX | 20 | style="background:#CEF"| MCA,16-bit | 5 | 4 | one2.88MB | 80MB SCSI | 4MB | 16MB | VGA | optional | Desktop | 1991-06 | |||||||||||||||
| IBM PS/2 Model 60 | 8560-041 | Intel 80286 | 10 (1 w) | style="background:#CEF"| MCA,16-bit | 8 | 4 | one1.44MB | 44MB ST-506 | 1MB | 7MB | VGA | optional | Tower | 1987-04 | |||||||||||||||
| IBM PS/2 Model 65 SX | 8565-061 | i386SX | 16 | style="background:#CEF"| MCA,16-bit | 8 | 4 | one1.44MB | 60MB SCSI | 2MB | 8MB | VGA | optional | Tower | 1990-03 | |||||||||||||||
| IBM PS/2 Model 70 386 | 8570-061 | i386 | 20 | style="background:#CCF"| MCA,32-bit | 3 | 3 | one1.44MB | 60MB ESDI | 2MB | 6MB | VGA | optional | Desktop | 1989-09 | |||||||||||||||
| IBM PS/2 Model 70 486 | 8570-B21 | i486 | 25 | style="background:#CCF"| MCA,32-bit | 3 | 3 | one1.44MB | 120MB ESDI | 2MB | 8MB | VGA | optional | Desktop | 1989-12 | |||||||||||||||
| IBM PS/2 Model 80 | 8580-041 | i386 | 16 | style="background:#CCF"| MCA,32-bit | 8 | 5/6 | one1.44MB | 44MB ST-506 | 1MB | 2MB | VGA | optional | Tower | 1987-07 | |||||||||||||||
| 8580-081 | 20 | MCA,32-bit | 8 | 5/6 | one1.44MB | 80 MB SCSI | 2 MB | 4 MB | VGA | optional | Tower | 1990-10 | |||||||||||||||||
| 8580-A31 | 25 | MCA,32-bit | 8 | 5/6 | one1.44MB | 320 MB SCSI | 4 MB | 8 MB | VGA | optional | Tower | 1990-03 | |||||||||||||||||
| 9553-0B7 | IBM486SLC2 | 50 | MCA,16-bit | 3 | 3 | one1.44MB | 120 MB IDE | 4 MB | 16 MB | SVGA | optional | Desktop | 1993-11 | ||||||||||||||||
| 9556-DE9 | IBM486SLC3 | 75 | MCA,16-bit | 3 | 3 | one2.88MB | 170 MB SCSI | 8 MB | 16 MB | XGA-2 | optional | Desktop | 1994-02 | ||||||||||||||||
| 9533 | 50 | ISA,16-bit | 4 PC Card | 1 | one1.44MB | 350 MB IDE | 4 MB | 16 MB | XGA-2 | optional CRT/LCD | Small form factor desktop | 1993-07 |
PS/2 Server
Server295 8600-001 i486 Intel486 33 style="background:#CCF" Micro Channel architecture MCA,32-bit, dual 12 10 one1.44MB 400MB/1GB{{small (SCSI)}} 32MB 128MB Super VGA SVGA optional Tower Template:Date table sorting 1992 06 Supports up to28GB hot-swappable storage, RAID-5 compatible, dual processor optional, accepts only IBM400MB or1GB disks Server195 8600-003 2×i486 Intel486 50 style="background:#CCF" Micro Channel architecture MCA,32-bit, dual 12 10 one1.44MB 400MB/1GB{{small (SCSI)}} 32MB 128MB Super VGA SVGA optional Tower Template:Date table sorting 1993 04 Supports up to28GB storage, RAID-5 compatible, dual processor standard, accepts only IBM400MB or1GB disks| Model | IBM P/N | CPU | Clock speed (MHz) |
Bus type | Number of slots |
Number of drive bays |
FDD | HDD | Installed RAM |
Maximum RAM |
Graphics adapter | Display | Chassis type | Launch 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 | 9585-0XT | Intel 486SX | 33 | MCA, 32-bit | 8 | 7 | one 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 | one 2.88 MB | 540 MB (SCSI) | 8 MB | 256 MB | SVGA | optional | Tower | Template:Date table sorting | |
| Server 85 | 9585-0NG | Intel 486DX2 | 66 | MCA, 32-bit | 8 | 7 | one 2.88 MB | 540 MB (SCSI) | 8 MB | 256 MB | SVGA | optional | Tower | Template:Date table sorting | |
| Server 95 | 8595-0K6 | Intel 486 | 33 | MCA,32-bit | 8 | 8 | one1.44MB | 104MB(SCSI) | 8MB | 256MB | SVGA | optional | Tower | Template:Unknown | |
| Server95 Array | 9595-3NG | Intel486DX2 | 66 | MCA,32-bit | 8 | 9 | one1.44MB | 3×540MB(SCSI) | 8MB | 256MB | SVGA | optional | Tower | Template:Date table sorting 1993 11 | |
| Premium Server95 | 9595-Z0x | Intel DX2 Intel486DX2 Pentium (original) Intel Pentium |
66 | Micro Channel architecture MCA,32-bit | 8 | 7 | one2.88MB | 1GB{{small (SCSI)}} | 8MB | 256MB | Super VGA SVGA | optional | Tower | Template:Date table sorting 1994 12
Pre-installed with IBM LAN Server or NetWare |
|
Portables
| Model | IBM P/N | CPU | Clock Speed (MHz) |
Bus Type | Expansion Slots |
Drive Bays | FDD | HDD | Base RAM |
Max RAM |
Graphics Adapter | Display Type | Form Factor | 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 | Features slot for optional i387 math co-processor | |
| 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 | Equipped with slot for optional i387 co-processor | |
| 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 | Includes slot for optional i387 co-processor | |
| P75 | 8573-161 | Intel 486 | 33 | MCA,32-bit | 4 (two 16-bit, two 32-bit) | 0 | One1.44MB | 160MB (SCSI) | 4MB | 16MB | VGA | Monochrome gas plasma | Portable | Template:Date table sorting | SCSI controller integrated into planar board | |
| P75 | 8573-401 | Intel 486 | 33 | MCA,32-bit | 4 (two16-bit, two32-bit) | 0 | One1.44MB | 400MB (SCSI) | 4MB | 16MB | VGA | Monochrome gas plasma | Portable | Template:Date table sorting | SCSI controller integrated into planar board | |
| L40 SX | 8543-A44 | Intel386SX | 20 | Industry Standard Architecture (ISA),16-bit | 0 (one with AT bus expansion port) | 0 | One1.44MB | 60MB (IDE) | 2MB | 18MB | Video Graphics Array (VGA) | Monochrome LCD | Laptop | Template:Date table sorting 1991 03 | ||
IBM PS/2 N51SX |
8551-033 | i386SX | 16 | style="background:#FFC" Proprietary bus |
2 (PC Card) |
\(unknown\) |
One1.44MB |
40MB (IDE) |
2MB |
10MB |
Monochrome LCD |
Notebook |
\(unknown\) | |||
IBM PS/2 N51SLC |
8551-025 | IBM386SLC | 16 |
style="background:#FFC" Proprietary bus |
2 (PC Card) |
\(unknown\) |
One1.44MB |
80MB (IDE) |
2MB |
10MB |
Monochrome LCD |
Notebook |
\(unknown\) | |||
IBM PS/2 N33SX |
8533-A33 |
16 |
style="background:#FFC" Proprietary bus |
2 (PC Card) |
\(unknown\) |
One1.44MB |
40MB (IDE) |
\(unknown\) | \ (unknown\) | \ (unknown\) |
Monochrome LCD |
Notebook |
\(unknown\) | |||
|
8533-A35 |
16 |
style="background:#FFC" Proprietary bus |
2 (PC Card) |
\(unknown\) |
One1.44MB |
80MB (IDE) |
\(unknown\) | \(unknown\) | \(unknown\) |
Monochrome LCD |
Notebook |
\(unknown\) | ||||
|
8554-045 |
16 |
style="background:#FFC" Proprietary bus |
2 (PC Card) |
\(unknown\) |
One1.44MB |
80MB (IDE) |
2MB |
16MB |
Color TFT display |
Laptop |
\(unknown\) |
Related systems
... [similar Academic System entries omitted for brevity] ... Clinical Workstation EduQuest Thirty EduQuest Forty EduQuest Fifty EduQuest Thirty-cs EduQuest Fifty-cs 9608 Intel DX2 33 style="background:#CFC" ISA,16-bit 4 2 single1.44MB ... [additional EduQuest models omitted for brevity] ... Executive Workstation 7496 Intel8086 8(0 wait states) style="background:#FCC"| ISA,8-bit 3 0 single720 KB none 640 KB 640 KB Multi-Color Graphics Array (MCGA) Monochrome display All-in-one form factor Template:Date table sorting Designed specifically for healthcare environments; pairs with IBM7690 Clinical Workstation GE Fanuc Workmaster II 7186 i386 16 style="background:#CCF"| MCA,32-bit 0 0 single1.44MB 30MB (ESDI) 2MB 8MB VGA Monochrome gas plasma screen Portable design Template:Date table sorting Industrial-grade PS/2 P70 variant marketed by GE Fanuc| Model | IBM P/N | CPU | Clock rate (MHz) |
Bus architecture | Expansion slots count |
Drive bays count | FDD | HDD | Default RAM |
Maximum RAM |
Graphics adapter | Display | Chassis type | 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 | Includes ROMP processor on daughterboard; cannot operate simultaneously with the 286 CPU |
| 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 an add-on card; cannot function concurrently with the 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 | |
| 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 | ||
| 9603 | IBM 386SLC | 25 | ISA,16-bit | 4 | 2 | single 1.44 MB | 30 MB (IDE) | 1–4 MB | 20 MB | Super VGA (SVGA) | 14-inch color display | All-in-one design | Template:Date table sorting | ||
| 9604 | i486SX | 25 | ISA,16-bit | 4 | 2 | single1.44MB | 30MB (IDE) | 4MB | 20MB | SVGA | 14-inch color display | All-in-one unit | Template:Date table sorting | ||
| 9605 | i486SX | 25 | ISA,16-bit | 4 | 2 | single1.44MB | 30MB (IDE) | 4MB | 20MB | SVGA | 14-inch color display | All-in-one system | Template:Date table sorting | ||
| 9606 | Cyrix Cx486SLC2 | 25/50 | ISA,16-bit | 4 | 2 | single1.44MB |
SVGA 14-inch color All-in-one Template:Date table sorting |
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