IBM PS/2 Model 77
| Company type | Product line |
|---|---|
| Industry | Computer hardware |
| Predecessor | IBM PC |
| Founded | 1987 |
| Founder | International Business Machines Corporation (IBM) |
| Headquarters | Armonk , United States |
Area served | Worldwide |
| Products | Personal computers (desktops, towers, all-in-ones, portables, laptops, notebooks) |
| Parent | International Business Machines Corporation (IBM) |
The Personal System/2 (PS/2) series represented a collection of personal computers introduced by International Business Machines Corporation in 1987. This lineup constituted IBM's follow-up generation to the original IBM PC family, which was discontinued with the PS/2 launch in April 1987. The majority of PS/2 units incorporated the proprietary Micro Channel architecture (MCA) bus—a closed design intended to reestablish IBM's dominance in the PC industry. Nonetheless, certain entry-level variants continued to utilize the broadly adopted ISA bus, an open standard prevalent in earlier IBM PC models. The PS/2 range encompassed various formats, including desktops, tower systems, integrated all-in-ones, portable units, laptops, and notebooks.
Notes
- Legend
- Clarifications
- Models with IBM part numbers (P/N) denoting production and sales outside North America are not included.
- Unless otherwise noted, built-in or optional displays are typically 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, equipped with two 720 KB floppy drives, up to 640 KB RAM, bundled with the official PS/2 Mouse, Windows 2.0, and four blank floppy disks.
- Financial workstation editions featured a dedicated 50-key function keypad tailored for banking tasks.
- LS ("LAN Station") variants were diskless workstations lacking floppy and hard drives, connecting through Ethernet or Token Ring network adapters.
- Ultimedia configurations included integrated 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 setups.
Primary series
IBM PS/2 Model30 8530-001 Intel8086 8 MHz (0 wait states) style="background:#FCC"| ISA,8-bit bus 3 slots 2 bays one720KB floppy none 640KB base RAM 640KB max RAM MCGA graphics optional monitor available Desktop type 1989-04 IBM PS/2 Model30_286 8530-E01 Intel80286 10 MHz (1 wait state) style="background:#CFC"| ISA,16-bit bus 3 slots 2 bays one1.44MB floppy none 512KB base RAM 4MB max RAM VGA graphics optional monitor available Desktop form factor 1988-09 35 SX 8535-040 i386SX 20 MHz (0–2 wait states) style="background:#CFC"| ISA,16-bit bus 3 slots 2 bays one1.44MB floppy none 2MB base RAM 4MB max RAM VGA graphics optional monitor available Desktop design 1991-01 40 SX 8540-040 i386SX 20 MHz (0–2 wait states) style="background:#CFC"| ISA,16-bit bus 5 slots 4 bays one1.44MB floppy none or IDE hard drive up to80MB 2MB base RAM 16MB max RAM VGA graphics optional monitor available Desktop model 1991-06 IBM PS/2 Model50 8550-021 Intel80286 10 MHz (1 wait state) style="background:#CEF"|Micro Channel architecture,16-bit bus 4 slots 3 bays one1.44MB floppy 20MB ST-506 hard drive 1MB base RAM 1MB max RAM VGA graphics optional display Desktop chassis 1987-04 IBM PS/2 Model55 SX 8555-031 i386SX 16 MHz (0–2 wait states) style="background:#CEF"|MCA,16-bit bus 3 expansion slots 2 drive bays one1.44MB floppy 30MB ESDI hard drive 2MB base RAM 8MB max RAM VGA graphics optional monitor Desktop configuration 1989-05 IBM PS/2 Model70_386 8570-061 i386 20 MHz style="background:#CCF"|MCA,32-bit bus 3 slots 3 bays one1.44MB floppy 60MB ESDI hard drive 2MB base RAM 6MB max RAM VGA graphics optional monitor included Desktop form factor 1989-09 IBM PS/2 Model70_486 8570-B21 i486 25 MHz style="background:#CCF"|MCA,32-bit bus 3 expansion slots 3 drive bays one1.44MB floppy 120MB ESDI hard drive 2MB base RAM 8MB max RAM VGA graphics optional monitor present Desktop design 1989-12 IBM PS/2 Model80 8580-041 i386 16 MHz style="background:#CCF"|MCA,32-bit bus 8 slots 5 or 6 bays one1.44MB floppy 44MB ST-506 hard drive 1MB base RAM 2MB max RAM VGA graphics optional monitor offered Tower case 1987-07 53 SLC2 9553-0B7 IBM486SLC2 50 MHz style="background:#CEF"|MCA,16-bit bus 3 expansion slots 3 drive bays one1.44MB floppy 120MB IDE hard drive 4MB base RAM 16MB maximum RAM SVGA graphics optional monitor available Desktop design 1993-11 56 SLC 9556-053 IBM486SLC 20 MHz style="background:#CEF"|MCA,16-bit bus 3 slots 2 bays one2.88MB floppy 80 MB IDE hard drive 2 MB base RAM 16 MB maximum RAM XGA-2 graphics optional monitor offered Desktop model 1992-04 57 SLC 9557-059 IBM486SLC 50 MHz style="background:#CEF"|MCA,16-bit bus 5 expansion slots 4 drive bays one2.88 MB floppy 160 MB SCSI hard drive 8 MB base RAM 16 MB maximum RAM XGA-2 graphics optional monitor included Desktop configuration 1993-07 76 486 9576-0U6 i486SX 33 MHz style="background:#CCF"|MCA,32-bit bus 3 expansion slots 3 drive bays one2.88 MB floppy 104 MB SCSI hard drive 8 MB base RAM 32 MB maximum RAM XGA-2 graphics optional monitor offered Desktop form factor 1992-09 77s 9577-BNB Intel DX2 66 MHz style="background:#CCF"|MCA,32-bit bus 5 expansion slots 4 drive bays one2.88 MB floppy 270 MB SCSI hard drive 8 MB base RAM 64 MB maximum RAM XGA-2 graphics optional monitor included Desktop chassis 1994-06 90 XP486 8590-0G5 i486SX 20 MHz style="background:#CCF"|MCA,32-bit bus 4 expansion slots 4 drive bays one1.44 MB floppy 80 MB SCSI hard drive 4 MB base RAM 64 MB maximum RAM XGA graphics optional monitor included Desktop form factor 1990-10 95 XP486 8595-0G9 i486SX 20 MHz style="background:#CCF"|MCA,32-bit bus 8 expansion slots 8 drive bays one1.44 MB floppy 160 MB SCSI hard drive 4 MB base RAM 64 MB maximum RAM XGA graphics optional monitor offered Tower chassis 1990-10 90 XP486 8590-KLA Intel DX2 50 MHz style="background:#CCF"|MCA,32-bit bus 4 expansion slots 4 drive bays one2.88 MB floppy 212 MB SCSI hard drive 8 MB base RAM 64 MB maximum RAM XGA-2 graphics optional monitor available Desktop design 1993-03 95 XP486 8595-0LF Intel DX2 50 MHz style="background:#CCF"|MCA,32-bit bus 8 expansion slots 8 drive bays one1.44 MB floppy 400 MB SCSI hard drive 8 MB base RAM 64 MB maximum RAM XGA graphics optional monitor included Tower configuration 1990-10 E 9533 IBM486SLC2 50 MHz style="background:#CFC"|ISA,16-bit bus 4 PC Card slots 1 bay one1.44 MB floppy 350 MB IDE or no hard disk 4 MB base RAM 16 MB maximum RAM XGA-2 graphics Optional CRT or LCD display Small form factor desktop 1993-07| Model | IBM P/N | CPU | Clock speed (MHz) |
Bus type | Number of expansion slots |
Number of drive bays |
FDD | HDD | Base RAM |
Maximum RAM |
Graphics adapter | Display | Chassis type | Release date | Additional information |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | Integrated all-in-one | 1987-08 | Space Saving Keyboard layout |
| 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 | Integrated all-in-one | 1987-08 | Space Saving Keyboard layout |
| 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 display | Integrated all-in-one form factor | 1987-08 | Space Saving Keyboard layout included |
| IBM PS/2 Model 25 LS | 8525-L01 | Intel 8086 | 8 (0 w) | ISA, 8-bit bus | 2 | 2 | one720KB | none | 512KB | 640KB | MCGA | 12-inch monochrome monitor | All-in-one design | 1987-08 | Supports Token Ring networking |
| IBM PS/2 Model 25 286 | 8525-006 | Intel80286 | 10 (1 Template:Abbr w wait states) | ISA,16-bit | 2 | 2 | one1.44MB | none | 1MB | 4MB | Video Graphics Array (VGA) | 12-inch color display | All-in-one chassis | 1990-10 | Space Saving Keyboard included |
| IBM PS/2 Model25 SX | 8525-K00 | i386SX | 20 MHz | ISA,16-bit bus | 3 expansion slots | 2 drive bays | one1.44MB floppy | none | 1MB RAM | 16MB RAM max | VGA graphics | 12-inch color monitor | All-in-one unit | 1992-04 | |
PS/2 Server
| Model | IBM P/N | Processor | Clock speed (MHz) |
Bus | No. of slots |
No. of drive bays |
FDD | HDD | Standard 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 |
| Model | IBM P/N | Processor | Clock speed (MHz) | Bus | Slots | Drive bays | FDD | HDD | Default RAM | Maximum RAM | Video adapter | Monitor ?? Form factor ?? Release date ?? Remarks | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Additional significant PS/2 Server configurations with essential business capabilities: | |||||||||||||||
| Various (e.g., 9585-0XF, -0XG, -0XT) | Intel i486SX / i486 / i486DX2 / Pentium | Between 33 and 66 MHz | MCA, 32-bit | Up to nine | Up to eight | One floppy (1.44 or 2.88 MB) | SCSI HDDs ranging from approximately100 MB to multiple gigabytes, including RAID configurations | Default RAM up to16 MB | Maximum RAM up to256 MB | SVGA | Optional | Tower | Released between1992 and1994 | Engineered for enterprise environments with scalable memory and storage, supporting advanced SCSI and hot-swappable drive technologies. | |||||||||||||||
| Intel i486DX2 / Pentium |66 MHz | MCA,32-bit | Seven slots | Seven bays | Single2.88MB FDD | SCSI HDDs up to1 GB capacity | Stock RAM of8MB | Maximum RAM of256MB | SVGA video adapter | Optional monitor support | Tower chassis | Launched in December1994 | Equipped with IBM LAN Server or Novell NetWare out-of-the-box, aimed at network-centric business applications. | |||||||||||||||
| Intel i486 processors, dual CPU options at33 or50 MHz | MCA,32-bit dual-bus setup for improved throughput and scalability. Supports as many as12 expansion slots and10 drive bays with hot-swappable SCSI drives reaching28 GB capacity and RAID-5 support. Default RAM up to32MB with a maximum of128MB. SVGA graphics with optional monitors. Tower design introduced from mid-1992 through early1993. Targeted at high-demand enterprise workloads requiring robust reliability and extensibility. | |||||||||||||||
Portables
| Model | IBM P/N | CPU | Frequency (MHz) |
Bus type | Expansion slots count |
Drive bays count | 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 | Includes optional slot for i387 math 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 | Equipped with slot for optional i387 math 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 | ||
| P75 | 8573-401 | Intel 486 | 33 | MCA,32-bit | 4 (two 16-bit, two 32-bit) | 0 | one1.44MB | 400MB (SCSI) | 4MB | 16MB | VGA | Monochrome gas plasma | Portable | Template:Date table sorting | ||
| L40 SX | 8543-A44 | Intel386SX | 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 | ||
| IBM PS/2 N51SX | 8551-033 | i386SX | 16 | Proprietary bus | 2 (PC Card) | \x97 | one1.44MB | 40MB (IDE) | 2MB | 10MB | Video Graphics Array | Monochrome LCD | Notebook | \x97 | \x97 | |
| \x7C IBM PS/2 N51SLC | \x7C8551-025 | \x7CIBM386SLC | \x7C16 | Proprietary bus | \x7C2 (PC Card) | \x7C\x97 | \x7Cone1.44MB | \x7C80MB (IDE) | \x7C2MB | \x7C10MB | \x7CVideo Graphics Array | \x7CMonochrome LCD | \x7CNotebook | \x7C\x97 | \x7C\x97 | |
| \x7CIBM PS/2 N33SX | \x7C8533-A33 | \x7Ci386SX | \x7C16 | Proprietary bus | \x7C2 (PC Card) | \x7C\x97 | \x7Cone1.44MB | \x7C40MB (IDE) | \x7C\x97 | \x7C\x97 | \x7C\x97 | \x7CMonochrome LCD | \x7CNotebook | \x7C\x97 | \x7C\x97 | |
| \x7CIBM PS/2 N33SX | \x7C8533-A35 | \x7Ci386SX | \x7C16 | Proprietary bus | \x7C2 (PC Card) | \x7C\x97 | \x7Cone1.44MB | \x7C80MB (IDE) | \x7C\x97 | \x7C\x97 | \x7C\x97 | \x7CMonochrome LCD | \x7CNotebook | \x7C\x97 | \x7C\x97 | |
| \x7CIBM PS/2 Model CL57 SX | \x7C8554-045 | \x7CIBM386SLC | \x7C16 | Proprietary bus | \x7C2 (PC Card) | \x7C\x97 | \x7Cone1.44MB | \x7C80MB (IDE) | \x7C2MB | \x7C16MB | \x7CVideo Graphics Array | \x7CColor TFT | \x7CLaptop | \x7C\x97 | \x7C\x97 |
Related systems
... (similar Academic System variants omitted for brevity) ... ... (repetitive Academic System entries omitted) ... ... (similar entries for EduQuest Forty, Fifty, Thirty-cs, Fifty-cs, Thirty-five, Fifty-five, Forty-five omitted for brevity) ... ... (industrial and personal typing systems summarized below) ... ... ("Gearbox" industrial models including variants such as Models7552,7541,7542,7561,7562,7546,7568 and others summarized similarly) ... ... (Personal Typing System/2 and its variants follow a similar format) ...| Model | IBM P/N | CPU | Operating frequency (MHz) |
Bus architecture | Expansion slots count |
Drive bays count |
FDD | HDD | Installed 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 | ROMP CPU on daughter card; cannot operate concurrently 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 concurrently 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 concurrently 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 concurrently with 286 |
| Model | IBM P/N | CPU | Frequency (MHz) | Bus type | Slots count | Drive bays count | FDD type | HDD size | RAM installed | RAM max capacity | Video adapter type | Display type | Case design | Launch date | Comments |
| Model: IBM Clinical Workstation (7690) | P/N:7690 | CPU:Intel 8086 | Frequency:8 MHz (0 wait states) | ISA, 8-bit | Slots:4 | Drive bays:none | FDD:single 1.44 MB | HDD:none | RAM:640 KB installed, expandable to 8 MB | Video:Multi-Color Graphics Array (MCGA) | Display: Monochrome LCD | Form factor: Mobile workstation | Release date: September,1989 | Comments: Specifically designed mobile workstation for healthcare environments; pairs with IBM Executive Workstation (7496) | |
| Model: EduQuest Thirty (9603) | CPU:IBM 386SLC | Frequency:25 MHz | ISA,16-bit | Slots:4 | Drive bays:2 | FDD:single1.44MB | HDD:30MB IDE | RAM:1–4MB installed, up to20MB max | Video:Super VGA (SVGA) | Display:14-inch color screen | Form factor: All-in-one unit | Release date: March,1993 | Comments: Adapted from Model25 for educational use, optional sound card available; later versions lack IBM logo badge. | ||
| Model: IBM Executive Workstation (7496) | P/N:7496 | CPU:Intel8086 | Frequency:8 MHz (0 wait states) | ISA,8-bit | Slots:3 | Drive bays:none | FDD:single720 KB | HDD:none | RAM:640 KB both installed and maximum | Video:Multi-Color Graphics Array (MCGA) | Display: Monochrome | Form factor: All-in-one | Release date: September,1989 | Comments: Integrated healthcare computer utilizing Model30 motherboard; designed to work alongside IBM Clinical Workstation (7690). | |
| Model: GE Fanuc Workmaster II (7186) | CPU:Intel386 | Frequency:16 MHz | MCA,32-bit | Slots:none | Drive bays:none | FDD:single1.44MB | HDD:30MB ESDI | RAM:2MB installed, expandable to8MB | Video:Video Graphics Array (VGA) | Display type: Monochrome gas plasma | Case style: Portable | Release date: March,1990 | Comments:Ruggedized industrial PS/2 P70 variant marketed by General Electric FANUC. | ||
| Model series: Personal Typing System (6901-001 to -006) | CPU:Intel8086 | Frequency:8 MHz | ISA,8-bit | Slots:none or very limited | Drive bays count:2 | ... FDDs primarily single720 KB with options | ... HDD absent or small optional drives | ... RAM typically fixed at640 KB both installed and max | ... Video:Multi-Color Graphics Array (MCGA) | ... Displays mostly12-inch monochrome or color | ... Chassis type Desktop | ... Date of introduction July1987 | ... Notes Specialized Model30 variants focused on word processing and networking expansions; some bundled with Wheelwriter or Quietwriter peripherals. |