IBM PS/2 Model 85 9585-0XA Desktop 386SX 33MHz 16MB RAM 1GB HDD MCA

IBM PS/2 Model 85 9585-0XA Desktop 386SX 33MHz 16MB RAM 1GB HDD MCA

The IBM PS/2 Model 85 is a high-end tower-class desktop from IBM's Personal System/2 line, built around the Intel 386SX processor running at 33 MHz. This unit is the 9585-0XA configuration, equipped with 16MB of RAM and a 1GB hard drive. No operating system is installed. The machine uses IBM's proprietary Micro Channel Architecture (MCA) bus, which distinguishes the PS/2 line from ISA-based contemporaries of the era.

Specifications & What's Included

• Manufacturer: IBM
• Model: PS/2 Model 85
• Type: 9585-0XA
• Processor: Intel 386SX, 33 MHz
• RAM: 16 MB
• Hard Drive: 1 GB
• Bus Architecture: Micro Channel Architecture (MCA)
• Form Factor: Tower desktop
• Operating System: None — no OS included
• Front panel: Power LED (green), hard drive activity LED, drive bays
• Rear: Large exhaust fan, expansion slot covers, power switch
• No keyboard, mouse, or monitor included

Applications

The IBM PS/2 Model 85 was introduced in the late 1980s and early 1990s as part of IBM's push to reclaim control of the PC standard with its proprietary Micro Channel Architecture bus. The MCA bus offered higher bus bandwidth and improved arbitration over ISA, and the PS/2 line was marketed primarily to corporate and institutional buyers who needed reliable, managed workstations. The Model 85, sitting near the top of the PS/2 lineup, was commonly deployed in engineering workstations, financial institutions, government agencies, and large enterprise environments running OS/2 or DOS-based productivity software. Today, PS/2 Model 85 systems are sought after by vintage IBM collectors, OS/2 enthusiasts, and retrocomputing hobbyists maintaining period-accurate setups. The MCA bus requires MCA-specific expansion cards, which are distinct from ISA or PCI cards — a key compatibility consideration for buyers looking to expand or restore this system.