IBM 92G7690 Auto 16/4 Token Ring MC Adapter MCA Microchannel NIC Card

IBM 92G7690 Auto 16/4 Token Ring MC Adapter MCA Microchannel NIC Card

The IBM 92G7690 is an Auto 16/4 Token Ring network adapter designed for IBM's Microchannel Architecture (MCA) bus. It supports both 4 Mbps and 16 Mbps Token Ring speeds with automatic speed sensing, and connects to a Token Ring network via an RJ-45 port on the bracket. The board is marked AUTO 16/4 TOKEN RING MC ADAPTER and carries FRU number 92G7690 with a secondary part number of 92G7689.

Specifications & What's Included

• Brand: IBM
• FRU / Part Number: 92G7690
• Secondary Part Number: 92G7689
• Bus Interface: MCA (Microchannel Architecture)
• Network Standard: Token Ring, Auto 16/4 Mbps
• Data Rates: 4 Mbps and 16 Mbps (auto-sensing)
• Bracket Connector: RJ-45
• On-board transformer: Pulse brand transformer visible on PCB
• Form Factor: Full-length MCA card with blue MCA retaining bracket
• Card only — no cables or accessories Ring was IBM's proprietary LAN technology, standardized under IEEE 802.5, widely deployed in corporate and institutional networks from the mid-1980s through the late 1990s. Unlike Ethernet's contention-based access, Token Ring used a token-passing protocol over a logical ring topology, which provided deterministic performance — a key advantage in environments where predictable network latency mattered. The MCA (Microchannel Architecture) bus was introduced with the IBM PS/2 line in 1987 as a proprietary 32-bit replacement for the ISA bus, offering bus mastering and auto-configuration features well ahead of ISA's capabilities. This adapter was designed for IBM PS/2 systems and other MCA-based machines used in those corporate IBM network environments. Today these cards are sought by collectors and administrators maintaining legacy IBM PS/2 hardware, Token Ring lab environments, and vintage computing systems. The MCA bus and Token Ring standard are both discontinued technologies, making working examples like this increasingly hard to find.
  Condition: Used
  This IBM 92G7690 Auto 16/4 Token Ring MC Adapter has been inspected and appears to be in good condition. The card shows normal handling wear consistent with prior use in an IBM PS/2 or compatible MCA-based system. The PCB, MCA edge connector, and RJ-45 port all appear intact with no visible damage. Please view our photo set and contact us if you have any questions. Visit Our Store

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