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This vintage IBM expansion card features a dual-port configuration with a 9-pin serial port and a proprietary 9-pin connector, likely for keyboard or mouse input on early PC systems. The board is populated with period-correct integrated circuits, including an INS8250AN UART chip and various IBM-branded logic chips dated to 1984. This ISA bus interface card is an authentic component for 8088 or 8086 based retro computing builds, providing essential I/O connectivity.

• Brand: IBM
• Part Number: 6323657
• Interface: 8-bit ISA
• Controller: National Semiconductor INS8250AN
• Ports: 1x DB9 Serial (Male), 1x DB9 (Female)

Retrocomputing, Vintage PC, ISA Card, Serial Interface, IBM 5150, IBM 5160, XT AT, 8-bit ISA, UART 8250, Legacy Hardware, Computing History, Collector, Replacement Part, Expansion Board, 1980s Tech