IBM Personal System/2 - Technology - Models

Models

At launch, the PS/2 family comprised the Model 30, 50, 60 and 80; the Model 25 was launched a few months later.

The PS/2 Models 25 and 30 (IBM 8525 and 8530 respectively) were ISA-based (in other words, essentially IBM PC-like systems in a different form factor) systems, originally only available with Intel 8086 CPUs. These machines also differed from other PS/2 models in having 720k floppy disk drives, an ST506-compatible hard drive controller and MCGA graphics. The hard drives were available as an optional part; however, many of these entry-level machines were sold without hard drives due to the high cost.

The Model 25 featured an integrated monochrome or color monitor to compete with the Apple Macintosh as an integrated system for educational environments. An external "paper white" monochrome screen was also available as a cost-saving model instead of the standard VGA display; this was often paired with the Model 30.

Later ISA PS/2 models comprised the Model 30-286 (a Model 30 with an Intel 286 CPU), Model 35 (IBM 8535) and Model 40 (IBM 8540) with Intel 386SX or IBM 386SLC processors.

The higher-numbered models were equipped with the MCA bus and mostly ESDI or SCSI hard drives (models 60-041 and 80-041 being MFM based). PS/2 Models 50 (IBM 8550) and 60 (IBM 8560) used the Intel 286 processor, the PS/2 Models 70 (IBM 8570) and 80 used the 386DX, while the medium-performance PS/2 Model 55SX (IBM 8555-081) used the 16/32-bit 386SX processor. Later Model 70 and 80 variants (B-xx) also used 25 MHz Intel 486 processors, in a complex called the Power Platform.

The PS/2 Models 90 (IBM 8590/9590) and 95 (IBM 8595/9595/9595A) used Processor Complex daughterboards holding the CPU, memory controller, MCA interface, and other system components. The available Processor Complex options ranged from the 20 MHz Intel 486 to the 90 MHz Pentium and were fully interchangeable. The IBM PC Server 500, which has a motherboard identical to the 9595A, also uses Processor Complexes.

Other later MicroChannel PS/2 models included the Model 65SX with a 16 MHz 386SX; various Model 53 (IBM 9553), 56 (IBM 8556) and 57 (IBM 8557) variants with 386SX, 386SLC or 486SLC2 processors; the Models 76 and 77 (IBM 9576/9577) with 486SX or 486DX2 processors respectively; and the 486-based Model 85 (IBM 9585).

The IBM PS/2E (IBM 9533) was the first Energy Star compliant personal computer. It had a 50 MHz IBM 486SLC processor, an ISA bus, four PC card slots, and an IDE hard drive interface. The environmentally friendly PC borrowed many components from the ThinkPad line and was composed of recycled plastics, designed to be easily recycled at the end of its life, and used very little power.

IBM also produced several portable and laptop PS/2s, including the Model L40 (ISA-bus 386SX), N33 (IBM's first notebook-format computer from year 1991, Model 8533, 386SX), N51 (386SX/SLC), P70 (386DX) and P75 (486DX2).

The IBM PS/2 Server 195 and 295 (IBM 8600) were 486-based dual-bus MCA network servers supporting asymmetric multiprocessing, designed by Parallan Computer Inc.

The IBM PC Server 720 (IBM 8642) was the largest MCA-based server made by IBM, although it was not, strictly speaking, a PS/2 model. It could be fitted with up to six Intel Pentium processors interconnected by the Corollary C-bus and up to eighteen SCSI hard disks. This model was equipped with seven combination MCA/PCI slots.

The IBM ThinkPad 700C, aside from being labeled "700C PS/2" on the case, featured MCA and a 486SLC CPU.

This list is incomplete; you can help by expanding it.
Year IBM Model Number Name Processor Bus HD Interface Case Notes
1987 8525-001 Model 25 8MHz Intel 8086 ISA 8 bit Desktop with integrated Monochrome display Single disk drive
1987 8525-004 Model 25 8MHz Intel 8086 ISA 8 bit Desktop with integrated Color display Single disk drive
1987 8525-G01 Model 25 8MHz Intel 8086 ISA 8 bit Desktop with integrated Monochrome display Single disk drive, enhanced keyboard
1987 8525-G04 Model 25 8MHz Intel 8086 ISA 8 bit Desktop with integrated Color display Single disk drive, enhanced keyboard
8525-101 Model 25 8MHz Intel 8086 ISA 8 bit Desktop with integrated Monochrome display Single disk drive
8525-104 Model 25 8MHz Intel 8086 ISA 8 bit Desktop with integrated Color display Single disk drive
1988 8525-L01 Model 25 8MHz Intel 8086 ISA 8 bit Desktop with integrated Monochrome display Single disk drive, token-ring network adapter
1988 8525-L04 Model 25 8MHz Intel 8086 ISA 8 bit Desktop with integrated Color display Single disk drive, token-ring network adapter
1987 8525-C02 Model 25 Collegiate 8MHz Intel 8086 ISA 8 bit Desktop with integrated Monochrome display Two disk drives
1987 8525-C05 Model 25 Collegiate 8MHz Intel 8086 ISA 8 bit Desktop with integrated Color display Two disk drives
1987 8525-K02 Model 25 Collegiate 8MHz Intel 8086 ISA 8 bit Desktop with integrated Monochrome display Two disk drives, enhanced keyboard
1987 8525-K05 Model 25 Collegiate 8MHz Intel 8086 ISA 8 bit Desktop with integrated Color display Two disk drives, enhanced keyboard
1990 8525-006 Model 25 286 10MHz Intel 286 ISA 16 bit Desktop with integrated Color display Single HD disk drive
1990 8525-036 Model 25 286 10MHz Intel 286 ISA 16 bit ST-506, 30MB drive Desktop with integrated Color display Single HD disk drive
1990 8525-G06 Model 25 286 10MHz Intel 286 ISA 16 bit Desktop with integrated Color display Single HD disk drive, enhanced keyboard
1990 8525-G36 Model 25 286 10MHz Intel 286 ISA 16 bit ST-506, 30MB drive Desktop with integrated Color display Single HD disk drive, enhanced keyboard
1992 8525-K00 Model 25 SX 16MHz Intel 386 SX ISA 16 bit Desktop with integrated Color display Single HD disk drive
1992 8525-K01 Model 25 SX 16MHz Intel 386 SX ISA 16 bit Desktop with integrated Color display Single HD disk drive, Ethernet network adapter
1992 8525-L02 Model 25 SX 16MHz Intel 386 SX ISA 16 bit Desktop with integrated Color display Single HD disk drive, Token-ring network adapter
1989 8530-001 Model 30 8MHz Intel 8086 ISA 8 bit Desktop Single disk drive
1987 8530-002 Model 30 8MHz Intel 8086 ISA 8 bit Desktop Two disk drives
1987 8530-021 Model 30 8MHz Intel 8086 ISA 8 bit ST-506, 20MB Desktop Single disk drives
1988 8530-E01 Model 30 286 10MHz Intel 286 ISA 16 bit Desktop Single HD disk drive
1988 8530-E21 Model 30 286 10MHz Intel 286 ISA 16 bit ESDI, 20MB Desktop Single HD disk drive
1989 8530-E31 Model 30 286 10MHz Intel 286 ISA 16 bit ESDI, 30MB Desktop Single HD disk drive
1991 8530-E41 Model 30 286 10MHz Intel 286 ISA 16 bit ESDI, 45MB Desktop Single HD disk drive
1987 8530-R02 Model 30 8MHz Intel 8086 ISA 8 bit Desktop, intelligent financial workstation Two disk drives, 4700 host support
1987 8530-R21 Model 30 8MHz Intel 8086 ISA 8 bit ST-506, 20MB Desktop, intelligent financial workstation Single disk drives, 4700 host support
1988 8530-E0R Model 30 286 10MHz Intel 286 ISA 16 bit Desktop, intelligent financial workstation Single HD disk drive, 4700 host support
1988 8530-E2R Model 30 286 10MHz Intel 286 ISA 16 bit ESDI, 20MB Desktop, intelligent financial workstation Single HD disk drive, 4700 host support
1987 8550-021 50 Intel 80286 MCA 16 bit desktop
1987 8560 60 Intel 80286 MCA 16 bit MFM or ESDI tower
1987 8580 80 Intel 80386 DX MCA 32 bit MFM or ESDI tower
1988 8550-031, 8550-061 50 Z Intel 80286 MCA 16 bit desktop
1988 8570 70 Intel 80386 DX MCA 32 bit desktop
1989 8555 55 SX Intel 80386 SX MCA 16 bit ESDI desktop
1989 8570 70 Intel 80386 DX, Intel 80486 MCA 32 bit desktop
1989 8573-031 P70 386 Intel 80386 DX MCA 32 bit portable 2 MCA slots, one full length, one half length.
1990 8573 P75 486 Intel 80486 MCA 32 bit SCSI portable 4 MCA slots, two full length, two half length.
1990 8580 80 Intel 80386 DX MCA 32 bit SCSI tower
1990 8556 56 SX Intel 80386 SX MCA 16 bit desktop
1990 8565 65 SX Intel 80386 SX MCA 16 bit SCSI tower
1990 8590 90 XP 486 Intel 80486 MCA 32 bit SCSI desktop
1990 8595 95 XP 486 Intel 80486 MCA 32 bit SCSI tower
1991 8540 40 SX Intel 80386 SX ISA 16 bit desktop
1991 8557 57 SX Intel 80386 SX MCA 16 bit SCSI desktop
1991 8570 70 Intel 80386 DX, Intel 80486 MCA 32 bit desktop

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