Up for sale is a vintage SIIG Inc. I/O Extension A.3 8-bit ISA Expansion Card. This multi-I/O legacy controller is perfect for retro computer builders, MS-DOS gaming enthusiasts, or industrial facilities maintaining vintage 286, 386, or 486 PC hardware.

Condition Notes

This card was acquired through an industrial asset surplus sale. It is in exceptionally clean physical condition with pristine gold contacts and absolutely no signs of wear, dust, or damage. Because we do not have a legacy test bench with an ISA motherboard slot, this unit is being sold as-is / untested, but it physically looks like an uninstalled or very well-preserved piece of hardware. Please note that this listing is for the bare board only (as pictured).

Technical Specifications:

• Brand: SIIG Inc.

• Model: I/O Extension A.3

• Interface: 8-Bit ISA Bus (Legacy AT-compatible)

• Ports On Board:

• 1x 9-Pin Serial (COM Port / RS-232)

• 1x 25-Pin Parallel (LPT Printer Port)

• 1x 15-Pin Game Port (Joystick)

• Includes internal pin headers to route a second serial port.

• Configurability: Fully adjustable hardware jumper blocks for address mapping (COM1-COM4 / LPT1-LPT2).