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This listing is for a 3COM TokenLink III 16/4 ISA Network Adapter, model 3C619B, part number 36-0032-000, with a manufacturing date code of 03-2019. This is a 16-bit ISA Token Ring network interface card designed for legacy systems that require reliable Token Ring connectivity at 4 Mbps or 16 Mbps. It is ideal for industrial environments, vintage PC restoration, and maintaining older enterprise networks that still rely on Token Ring infrastructure.

The 3C619B TokenLink III uses the National Semiconductor DP8025 Token Ring controller, known for stable ring operation and compatibility with IBM Type 1 STP cabling and UTP Token Ring cabling. The card supports both DB-9 and RJ-45-style Token Ring connectors, allowing flexible integration into various Token Ring setups.

This adapter includes DIP switch configuration options for IRQ, I/O base address, shared RAM size, boot ROM address, network speed, and data bus width, making it suitable for complex legacy environments where resource allocation must be manually controlled.

Key Features

• Brand: 3COM

• Model: 3C619B TokenLink III

• Part Number: 36-0032-000

• Bus Type: 16-bit ISA

• Network Type: Token Ring

• Supported Speeds: 4 Mbps and 16 Mbps

• Connectors: DB-9 (STP) and RJ-45-style Token Ring (UTP)

• Controller: National Semiconductor DP8025

• Boot ROM Socket: 40-pin DIP

• Configuration: DIP switches for IRQ, I/O base, RAM size, ROM address, speed, and bus width

• Date Code: 03-2019

Detailed Description

The 3COM 3C619B TokenLink III 16/4 ISA Adapter is a legacy Token Ring NIC designed for systems equipped with 16-bit ISA expansion slots. It supports both 4 Mbps and 16 Mbps Token Ring operation, selectable via DIP switches. The card provides two physical network interfaces:

• DB-9 connector for shielded twisted pair (STP) cabling

• RJ-45-style connector for unshielded twisted pair (UTP) Token Ring cabling

These connectors are Token Ring interfaces, not Ethernet. The RJ-45-style port resembles Ethernet but is electrically and functionally different.

The adapter includes a 40-pin DIP socket for an optional boot ROM, allowing network booting in supported environments such as DOS, OS/2, and early Windows systems.

DIP switches allow configuration of:

• IRQ (2/9, 3, 6, 7)

• I/O base address (A20h or A24h)

• Shared RAM size (8 KB, 16 KB, 32 KB, 64 KB)

• Boot ROM address range

• Network speed (4 Mbps or 16 Mbps)

• Data bus width (8-bit or 16-bit)

This flexibility makes the 3C619B suitable for multi-card installations, industrial systems, and environments requiring precise hardware resource control.

Typical Applications

• Legacy enterprise Token Ring networks

• Industrial control systems using Token Ring infrastructure

• Vintage PC restoration (DOS, OS/2, early Windows)

• Museum and lab environments requiring period-correct networking hardware

Condition and Warranty

• Condition: (Specify your condition: New old stock, refurbished, tested working)

• Testing: Adapter inspected and tested for proper ring operation, shared RAM functionality, and diagnostics

• Warranty: Includes your stated hardware warranty

Compatibility Notes

• Requires a system with a 16-bit ISA slot

• Requires Token Ring network infrastructure (MAU/hub)

• All devices on the ring must operate at the same speed (4 Mbps or 16 Mbps)

• Supported operating systems include DOS ODI, NDIS 2.x, OS/2, early Windows versions, and Novell NetWare

Included

• 3COM 3C619B TokenLink III ISA Adapter

• Anti-static protective packaging

• Optional printed or digital configuration sheet

Full Technical Specification SheetGeneral

• Brand: 3COM

• Model: 3C619B TokenLink III

• Part Number: 36-0032-000

• Adapter Type: Token Ring Network Interface Card

• Bus Type: 16-bit ISA

• Date Code: 03-2019

Network

• Network Type: Token Ring

• Topology: Ring

• Supported Speeds: 4 Mbps and 16 Mbps

• Wiring Types:

  • Shielded twisted pair (STP) via DB-9

  • Unshielded twisted pair (UTP) via RJ-45-style Token Ring Interfaces

    • 1 x DB-9 Token Ring port

    • 1 x RJ-45-style Token Ring port

    • 40-pin DIP boot ROM socket

    Configuration (DIP Switches)

    Boot ROM Address Range Options:

    • IRQ 2/9

    • IRQ 3

    • IRQ 6

    • IRQ 7

    I/O Base Address:

    • 8 KB

    • 16 KB

    • 32 KB

    • 64 KB

    Network Speed:

    • 4 Mbps

    • 16 Mbps

    Data Bus Width:

    Controller and Components

    • Main Controller: National Semiconductor DP8025 Token Ring controller

    • Shared RAM: Configurable 8 KB to 64 KB

    Physical and Environmental

    • Form Factor: Full-height internal ISA card

    • Operating Environment: Standard PC environmental ranges

    
    3COM 3C619B TOKENLINK III 16/4 16 BIT ISA ADAPTER WITH WARRANTY36-0032-000 / 03-2019