Description
Boca Research BRI4340 ISA I/O Card Startech ST16C452CJ Dual Serial Parallel DB25
The Boca Research BRI4340 is an 8-bit ISA multi-I/O expansion card that adds serial and parallel port connectivity to legacy ISA-bus desktop computers. At its core is the Startech Semiconductor ST16C452CJ dual UART controller, a PLCC-packaged chip that provides two independent 16550-compatible serial channels and supports parallel port output through the card's bracket connectors. The card draws on the 8-bit ISA bus and is compatible with both 8-bit and 16-bit ISA slots.
Specifications & What's Included
- Manufacturer: Boca Research Inc.
- Model / Part Number: BRI4340
- Main Controller Chip: Startech Semiconductor ST16C452CJ (date code EPS9302)
- Bus Interface: 8-bit ISA (Industry Standard Architecture)
- Serial Ports: 2 × DB9 male (via bracket) — dual 16550-compatible UART channels
- Parallel Port: 1 × DB25 female (via bracket)
- Secondary chip: KS82C411 (visible on board — likely parallel/logic support)
- FCC ID: EUD5U9
- PCB Board Number: 305134 (printed on solder side)
- Form Factor: Half-length ISA card with single-slot bracket
- Included: Card only — no cables, drivers, or software
Applications
ISA multi-I/O cards like the BRI4340 were standard expansion hardware for DOS and early Windows PCs of the late 1980s and early 1990s — the era when ISA was the dominant expansion bus before PCI took over in the mid-1990s. They were used to add or replace serial and parallel ports on desktop systems, allowing connection of external modems, serial mice, printers, plotters, label printers, and other peripherals. The Startech ST16C452CJ dual UART at the center of this card is a 16550-compatible device, meaning it supports the 16-byte FIFO buffers that were critical for reliable high-speed serial communication under multitasking operating systems like Windows 3.x and OS/2. Today these cards remain sought by collectors and administrators maintaining legacy industrial PCs, CNC controllers, point-of-sale systems, and other embedded or vintage computers that still run ISA-slot hardware and require additional COM or LPT ports.
This Boca Research BRI4340 ISA I/O card has been inspected and is in good used condition. It was pulled from a working environment. The board shows light age-related patina typical of legacy ISA-era hardware, but the PCB, edge connector fingers, and bracket connectors appear clean with no obvious damage. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Boca Research |
Model: |
BRI4340 |
MPN: |
BRI4340 |
Secondary Model: |
ST16C452CJ |
Type: |
ISA Multi I/O Expansion Card |
SKU: |
41064 |
Chipset: |
Startech Semiconductor ST16C452CJ (EPS9302) |
Bus Interface: |
ISA (8-bit) |
Serial Ports: |
2x (DB9 male) |
Parallel Ports: |
1x (DB25 female) |
Connector Types: |
DB9, DB25 |
FCC ID: |
EUD5U9 |
Form Factor: |
Half-Length ISA Card |
Compatible With: |
8-bit and 16-bit ISA desktop PCs |
Condition: |
Used – Pulled from Working Environment |
Seller Notes: |
Card only; no cables or software included |
Country/Region of Manufacture: |
South Korea |
Condition Notes: |
Boca Research BRI4340 ISA I/O card inspected, good used condition. Pulled from a working environment. Board and connectors clean with light age wear. No visible damage. |
