Zenith 85-3360-02 CPU Memory Expansion Board SBR204 181-6116-3M AMD N80L286-8S

Zenith 85-3360-02 CPU Memory Expansion Board SBR204 181-6116-3M AMD N80L286-8S

The Zenith 85-3360-02 is a full-length ISA CPU and memory expansion board produced by Zenith Data Systems, carrying part designations SBR204 and 181-6116-3M. The board is built around an AMD N80L286-8S processor — AMD's low-power 80286 variant running at 8 MHz — and is populated with a large array of DIP memory and logic ICs across its full board length. A date code of 093087 stamped on the PCB places manufacture in September 1987, firmly in the late-1980s era of IBM PC/AT-compatible computing.

Specifications & What's Included

• Manufacturer Part Number: 85-3360-02
• Secondary Part Numbers: SBR204, 181-6116-3M
• Main Processor: AMD N80L286-8S (80286, 8 MHz, low-power CMOS variant)
• Bus Interface: Full-length ISA (Industry Standard Architecture) expansion card
• PCB Date Code: 093087 (September 1987)
• DIP switch banks and trim potentiometers visible on bracket edge (configuration jumpers)
• Large array of DIP ICs populating majority of board surface (memory and logic)
• ISA bracket with standard full-height profile included
• Board only — no cables or software included

Applications

Zenith Data Systems produced a line of IBM PC/AT-compatible desktop computers through the mid-to-late 1980s, targeted heavily at government, education, and business markets. The Z-200 series and related Zenith desktop platforms used proprietary expansion boards like this one to add or upgrade CPU and memory resources — extending the useful life of a base system or upgrading it from an 8088/8086 configuration to a 286-class processor. The AMD N80L286-8S was a pin-compatible, low-power alternative to Intel's 80286, and its presence here is typical of cost-optimized OEM board designs of the era. Boards of this type are now sought primarily by collectors and technicians maintaining vintage Zenith Data Systems equipment, as well as hobbyists restoring IBM PC/AT-era machines. The ISA bus standard that this card uses was the dominant expansion interface from the early 1980s through the mid-1990s, before being displaced by PCI.