Name: Etherlink III 16-bit ISA NIC
Brand: 3Com
Price: 56.95 USD
Availability: InStock

3Com 3C509C Etherlink III 16-bit ISA NIC

The 3Com Etherlink III 16-bit ISA NIC (model 3C509C) delivers reliable Ethernet connectivity for legacy ISA bus systems. Designed for desktop computers and industrial controllers that still rely on ISA slots, this network interface card provides a st... Read More

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$56.95

In Stock: 2
Manufacturer: 3Com
Model or Part: 3C509C
Condition: Refurbished
Weight: 1.00lb

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Product Information

Item Condition

New - Sealed or Open Box Condition
Excellent - Almost-New, Missing Original Packaging
Refurbished - Seller Refurbished, Good Condition, Previously Used Item

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Description

Overview
The 3Com Etherlink III 16-bit ISA NIC (model 3C509C) delivers reliable Ethernet connectivity for legacy ISA bus systems. Designed for desktop computers and industrial controllers that still rely on ISA slots, this network interface card provides a stable 10Mbps Ethernet link with low CPU overhead. It is an ideal solution for upgrading older hardware to modern network environments without the need for a complete system replacement.

Key Features

10Mbps Ethernet support on a 16-bit ISA bus
Plug and play compatibility with most DOS, Windows 3.x, Windows 95/98 and early NT operating systems
Integrated RJ-45 connector with built-in magnetics for easy installation
Full duplex operation optional via driver configuration
Low power consumption suitable for embedded and industrial applications
Robust metal shield to reduce electromagnetic interference

Technical Specifications

Interface: 16-bit ISA, 8-bit ISA compatible
Bus speed: 8 MHz ISA bus
Network speed: 10Mbps Ethernet (IEEE 802.3)
Connector: RJ-45 with integrated magnetics
DMA: 8-bit DMA channel support
Interrupt: Configurable IRQ (default IRQ 5)
MAC address: Factory programmed, unique 48-bit address
Operating temperature: 0 to 70 deg Celsius
Power supply: 5V DC from ISA slot

Applications
The 3C509C is perfect for:

Legacy desktop PCs that require network access for file sharing or internet connectivity
Industrial control systems and PLCs that still use ISA slots but need Ethernet communication
Point of sale terminals and kiosks that run older operating systems
Educational labs and training environments where older hardware is maintained for teaching purposes
Retro computing enthusiasts building authentic period-accurate systems

By installing the 3Com Etherlink III 16-bit ISA NIC, users can extend the life of existing hardware, achieve stable network performance, and avoid costly system upgrades. Its straightforward installation and broad driver support make it a practical choice for any ISA-based platform that requires dependable Ethernet connectivity.