Description
Zenith IO Board 111087 85-3400-01 ISA I/O Card for 286 386 Computer
This is a Zenith ISA I/O expansion card designed for use in Zenith 286 and 386-class desktop computers. The board carries part numbers 111087 and 85-3400-01, confirmed on the printed board label visible in photos. It is a full-length ISA card providing parallel and serial I/O connectivity through bracket-mounted connectors, with onboard logic ICs and what appears to be a Hitachi HD46818AP real-time clock (RTC) chip among the populated components.
Specifications & What's Included
- Manufacturer: Zenith (Zenith Data Systems)
- Part Number: 111087
- Assembly Number: 85-3400-01
- Secondary Part / Reference: 181-6115-5C
- Bus Interface: ISA (full-length card)
- Bracket Connectors: DB25 (parallel port), DB9 (serial port)
- Notable ICs: Hitachi HD46818AP real-time clock (RTC); Toshiba logic ICs visible on board
- Form Factor: Full-length ISA expansion card
- Compatible Systems: Zenith 286 and 386 desktop computers
- Included: Board only — no cables or accessories
Applications
Zenith Data Systems (ZDS) produced a line of IBM PC-compatible desktop computers in the 1980s and early 1990s built around Intel 286 and 386 processors, targeting the business and government market. I/O expansion cards like this one provided the parallel and serial ports that connected printers, plotters, modems, and other peripherals to these systems. The ISA (Industry Standard Architecture) bus was the dominant expansion interface throughout this era, and full-length cards such as this were standard in tower and desktop chassis of the period. Today, boards like this are sought primarily by collectors restoring vintage Zenith systems and by organizations still maintaining legacy ZDS hardware in specialized environments. The HD46818AP RTC chip visible on this board was a widely used real-time clock and CMOS RAM device of the late 1980s, commonly found in XT- and AT-class machines to maintain system time and BIOS settings.
This Zenith IO Board (111087 / 85-3400-01) ISA I/O expansion card has been inspected and appears to be in good used condition. The board shows normal surface aging consistent with prior use in a desktop system. No cracked traces, damaged connectors, or missing components are visible. The DB25 parallel and DB9 serial port connectors on the bracket appear intact. It has not been powered or tested at our facility. Please view our photo set and contact us if you have any questions. Please note: We have multiple units in stock — yours may not be the one shown in the photos, however, it will be similar in condition and function.
Warranty Information
Additional Information
Brand: |
Zenith |
Model: |
111087 |
MPN: |
85-3400-01 |
Secondary Model: |
181-6115-5C |
SKU: |
8638 |
Type: |
ISA I/O Expansion Card |
Form Factor: |
ISA Card (Full-Length) |
Bus Interface: |
ISA |
Compatible With: |
Zenith 286 and 386 desktop computers |
Connector Types: |
DB25 (parallel), DB9 (serial) |
Condition: |
Used – Inspected |
Seller Notes: |
Board only; no cables or accessories included. |
Country/Region of Manufacture: |
Japan |
Condition Notes: |
Zenith IO Board 111087 85-3400-01 ISA I/O card. Inspected; appears in good used condition with normal aging. DB25 and DB9 bracket connectors intact. Not powered or tested at our facility. Board only. |
