Boca Research 4522 8-Port 16-Bit ISA Internal Modem Card 4522-01 H8037F

Boca Research 4522 8-Port 16-Bit ISA Internal Modem Card 4522-01 H8037F

The Boca Research 4522 is an 8-port 16-bit ISA internal modem card designed to provide multiple simultaneous analog modem connections from a single ISA expansion slot. It carries FCC ID EUD 5U9 BRI4520 and was manufactured in the USA. The card is equipped with two Texas Instruments TL16C554FN quad UART controllers, which handle the serial communication for all eight modem channels.

Specifications & What's Included

• Manufacturer: Boca Research
• Model: 4522
• Part Number: 4522-01
• Assembly / Barcode Reference: H8037F
• FCC ID: EUD 5U9 BRI4520
• Bus Interface: 16-bit ISA
• Number of Ports: 8
• Connector Type: 8x RJ-11 ports, bracket-mounted
• Main Controller Chips: 2x Texas Instruments TL16C554FN quad UART (92A5JNW BA)
• Country of Manufacture: USA (marked on PCB)
• Included: Card only

Applications

Multi-port ISA modem cards like the Boca Research 4522 were used in the 1990s to add multiple simultaneous dial-up modem connections to a single PC or server. They were common in small internet service provider (ISP) setups, bulletin board systems (BBS), remote access servers, and dial-in terminal applications — anywhere a single machine needed to handle multiple phone lines at once. The 16-bit ISA bus interface places this card firmly in the mid-to-late 1990s era of ISA-based PC expansion. ISA slots were standard in AT-class and early Pentium-era systems before PCI became dominant. Today these cards are primarily sought for legacy system maintenance, vintage computing, retro BBS restoration, or historical collection.