Description
US Robotics 87328 8-Bit ISA Internal Modem Fax Card CJE794 Rev 1.012.0121-A
The US Robotics 87328 is an 8-bit ISA internal modem and fax card designed for installation in IBM PC/XT, AT, and compatible desktop computers equipped with an ISA expansion slot. It provides dial-up modem and fax functionality directly from inside the PC, connecting to a standard telephone line through the RJ-11 TELCO port on the bracket, with a pass-through PHONE port for a desk telephone. The board carries the 73D216B-CP main controller IC and is FCC-registered for connection to the public switched telephone network.
Specifications & What's Included
- Manufacturer: US Robotics (USR)
- Model: 87328
- FCC ID: CJE-0121
- FCC Registration Number: CJE794-11323-DM-E
- Hardware Revision: Rev 1.012.0121-A
- Ring Equivalence Number (REN): 4B
- Bus Interface: 8-bit ISA (Industry Standard Architecture)
- Form Factor: Half-length ISA card
- Main Controller Chip: 73D216B-CP
- Bracket Ports: TELCO (RJ-11 line) and PHONE (RJ-11 pass-through)
- PCB Date: © 1989 U.S. Robotics, Inc.
- Country of Manufacture: Japan
- Included: Card only — no software, drivers, or documentation
Applications
8-bit ISA internal modems like the US Robotics 87328 were a staple of late-1980s and early-1990s PC expansion. Because the card uses an 8-bit ISA edge connector, it is compatible with both the original PC/XT bus and the wider AT/ISA bus, making it one of the broadest-compatibility modem options of its era. These cards connected desktop PCs to bulletin board systems (BBS), early online services such as CompuServe and Prodigy, and eventually the early internet via dial-up. The dual RJ-11 bracket — TELCO for the wall line and PHONE for a pass-through desk phone — was standard for home and small-office setups of the period. Today, cards like this are sought by collectors and hobbyists restoring vintage IBM PC/XT and AT-class machines to working condition, as well as by retro-computing enthusiasts running period-correct DOS or early Windows environments that require a genuine ISA hardware modem rather than a software or USB solution.
This US Robotics 87328 8-bit ISA internal modem/fax card has been inspected and is in good condition. The card appears clean with no obvious physical damage or broken components. The bracket shows light surface wear typical of a previously installed card. Both the TELCO and PHONE RJ-11 ports on the bracket are intact. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
US Robotics |
Model: |
87328 |
MPN: |
87328 |
Secondary Model: |
CJE794 |
Type: |
8-Bit ISA Internal Modem/Fax Card |
FCC ID: |
CJE-0121 |
FCC Registration Number: |
CJE794-11323-DM-E |
Hardware Revision: |
Rev 1.012.0121-A |
Ring Equivalence Number: |
4B |
Bus Interface: |
8-Bit ISA |
Form Factor: |
Half-Length ISA Card |
Controller Chip: |
73D216B-CP |
Interface Type: |
ISA (Industry Standard Architecture) |
Connector Type: |
RJ-11 (TELCO and PHONE ports) |
Number of Ports: |
2 (TELCO, PHONE) |
Country/Region of Manufacture: |
Japan |
Compatible With: |
IBM PC/XT, AT, and compatible 8-bit ISA systems |
SKU: |
48614 |
Condition: |
Used – Inspected and in Good Condition |
Seller Notes: |
Card only; no software or documentation included. |
Condition Notes: |
US Robotics 87328 8-bit ISA modem/fax card has been inspected and is in good condition. Card is clean with no physical damage. TELCO and PHONE RJ-11 ports intact. Normal light wear on bracket. |
