IBM PS/2 Model 56 9556-0BA 486SLC2 Desktop Computer MCA 8MB RAM For Parts

IBM PS/2 Model 56 9556-0BA 486SLC2 Desktop Computer MCA 8MB RAM For Parts

The IBM PS/2 Model 56 (machine type 9556-0BA) is a desktop personal computer built around IBM's 486SLC2 processor. This unit has a bad power supply and could not be powered on or tested. It is being offered AS-IS for parts or repair only.

Specifications & What's Included

• Machine Type / Model: IBM PS/2 Model 56, 9556-0BA
• Processor: IBM 486SLC2
• RAM: 8MB
• Hard Drive: 100MB (installed, visible in interior photos)
• Floppy Drive: IBM 1.44MB 3.5-inch floppy disk drive
• Bus Architecture: MCA (Micro Channel Architecture)
• Expansion Slots: 3 MCA slots
• Serial Ports: 2
• Parallel Port: 1 (printer)
• SCSI Port: 1
• Keyboard / Mouse: PS/2 keyboard and mouse ports
• Power Supply: Dual voltage — 100–120V or 200–240V, 50–60Hz (bad / non-functional)
• Form Factor: Desktop
• Condition: AS-IS for parts or repair — does not power on

Applications

The IBM PS/2 Model 56 was part of IBM's Personal System/2 line, introduced in the late 1980s and continuing into the early 1990s. The PS/2 line replaced the earlier PC/XT and AT-class machines and introduced the Micro Channel Architecture (MCA) bus, a 32-bit proprietary expansion bus designed to improve data throughput over the older ISA bus. MCA was used across IBM's mid-range PS/2 desktop and server offerings and supported features like bus mastering and automatic slot configuration. The Model 56 was positioned as a mid-range business workstation, used primarily in corporate and institutional environments running IBM OS/2, DOS, and early Windows. The 486SLC2 processor was IBM's own hybrid chip combining elements of the Intel 486 architecture with an internal clock doubler. Today these machines are primarily sought by vintage computer collectors and restoration hobbyists, as well as anyone maintaining legacy IBM PS/2 installations that require spare parts, boards, or MCA cards.