3Com
EtherLink III 3C509B-TPC ISA 10Mbps NIC RJ-45 BNC Dual Port Vintage Network
*Price sourced from Amazon.com. Last updated 2026-05-21. Price and availability subject to change.
3Com EtherLink III ISA network card, model 3C509B-TPC. Dual port — RJ-45 (10Base-T) and BNC (10Base-2). One of the most reliable and well-supported vintage NICs ever made. Excellent driver support across DOS, Windows 3.x/9x/NT, Linux, and BSD. SPECIFICATIONS: - Model: 3Com EtherLink III 3C509B-TPC - Speed: 10 Mbps - Interface: ISA - Ports: RJ-45 (10Base-T) + BNC (10Base-2) - ASSY: I03-0110-000 Rev A - S/N: 6HT26229499 - Made in Ireland Sold as-is, untested, vintage hardware. Ships in anti-static bag with bubble wrap protection.
SpecPicks Verdict
SpecPicks classifies 3Com EtherLink III 3C509B-TPC ISA 10Mbps NIC RJ-45 BNC Dual Port… as a niche pick — read recent reviews before buying in the networking cards category, based on limited Amazon review volume so far and our ranking model that weights rating × review-volume × price-fit. 3Com's positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for networking cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Backed by 3Com's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Full Specifications
| connector | RJ45, BNC |
|---|---|
| speed_mbps | 10 |
Ready to buy?
3Com EtherLink III 3C509B-TPC ISA 10Mbps NIC RJ-45 BNC Dual Port Vintage Network is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-05-21. Price and availability subject to change.
Related Networking Cards
