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NOS SIIG HighSpeed Hi-IRQ I/O Expander 4S ISA Serial Card w/ Box IO1813
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NOS SIIG HighSpeed Hi-IRQ I/O Expander 4S ISA Serial Card w/ Box IO1813
Price: US $34.67

NOS SIIG HighSpeed / Hi-IRQ I/O Expander 4S ISA Serial Card – Model IO1813

Excellent vintage find—this unit appears to be new old stock (open box) and includes original packaging and documentation.

✅ Features
  • Adds up to 4 serial (RS-232) ports
  • High-speed, Hi-IRQ support for expanded system flexibility
  • Designed for AT-compatible / ISA-based systems
  • Ideal for retro computing, industrial equipment, CNC, and legacy systems
📦 Included
  • SIIG I/O Expander 4S ISA Card
  • Original box
  • User manual
  • Protective anti-static packaging & foam
🔍 Condition Details
  • Appears unused (open box / NOS)
  • Clean board with no visible install wear
  • Includes original packaging materials
  • Box shows light shelf/storage wear
  • Untested due to lack of ISA test system
🎯 Perfect For
  • Retro PC builds
  • Industrial automation systems
  • Legacy serial device expansion
  • Collectors of vintage computer hardware
📦 Shipping
  • Ships securely boxed (not just retail packaging)
  • USPS Ground Advantage
  • 1 business day handling


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