Description
Zenith 85-3217-01 16-Bit ISA I/O Board 16-86 020486 DB25 DB9 Serial Parallel Card
The Zenith 85-3217-01 is a full-length 16-bit ISA I/O expansion board designed for Zenith 16-86 series personal computers. Silkscreened on the board as "IO BOARD 85-3217-01" with date/revision code 020486, it provides parallel and serial port connectivity via a rear bracket-mounted DB25 and DB9 connector pair. A secondary reference number of 444-357-2 also appears in the product data.
Specifications & What's Included
- Manufacturer: Zenith
- Board Part Number: 85-3217-01
- Board Designation (silkscreen): IO BOARD 85-3217-01
- Revision / Date Code: 16-86
- Secondary Part Number: 020486
- Reference Number: 444-357-2
- Bus Interface: 16-bit ISA (Industry Standard Architecture)
- Form Factor: Full-length ISA card
- Bracket Connectors: DB25 (parallel port) and DB9 (serial port)
- PCB population: multiple DIP ICs and logic chips visible on component side
- Included: board only — no cables or accessories
Applications
This board is a classic example of mid-1980s ISA I/O expansion hardware from the era when IBM PC-compatible systems relied on separate add-in cards to provide parallel and serial port connectivity. The 16-bit ISA bus was the dominant PC expansion standard from the mid-1980s through the early 1990s, succeeding the original 8-bit XT bus and running at 8 MHz. Zenith Data Systems was a prominent American manufacturer of IBM PC-compatible computers during this period, supplying business and government markets — including a significant share of U.S. federal and military contracts. Their 16-86 line referred to their 80286-based desktop systems. I/O boards like this one were used to add or replace parallel printer ports and RS-232 serial ports in these machines. Today, boards of this type are sought by vintage computer restorers, collectors, and technicians maintaining legacy Zenith systems that require period-correct hardware to restore original functionality.
This Zenith 85-3217-01 16-bit ISA I/O board has been inspected and appears to be in good condition. The PCB is clean with no visible cracks, burnt components, or broken traces. The DB25 and DB9 bracket connectors are intact and show only normal age-related wear. No cables or accessories are included — board only. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Zenith |
Model: |
85-3217-01 |
MPN: |
85-3217-01 |
Secondary Model: |
16-86 |
Part Number: |
020486 |
Reference Number: |
444-357-2 |
Type: |
16-Bit ISA I/O Expansion Card |
SKU: |
43769 |
Bus Interface: |
ISA (16-bit) |
Form Factor: |
Full-Length ISA Card |
Connector 1: |
DB25 (Parallel) |
Connector 2: |
DB9 (Serial) |
Board Label: |
IO BOARD 85-3217-01 |
Compatible With: |
Zenith 16-86 series ISA-bus computers |
Condition: |
Used – Inspected, appears in good condition |
Seller Notes: |
Board only; no cables or accessories included. |
Country/Region of Manufacture: |
United States |
Condition Notes: |
Zenith 85-3217-01 16-bit ISA I/O board. Inspected and appears in good condition. PCB is clean; DB25 and DB9 connectors intact. Board only — no cables included. |