Intel iSXM 101 Math Coprocessor Extension Kit (New Old Stock)

This listing is for a vintage Intel iSXM 101 System Extension Module kit in New Old Stock / Open Box condition. This complete set was designed to upgrade Intel Multibus-based single-board computers (System 310/330) with high-speed floating-point processing capabilities. It has been preserved in its original packaging since 1984 and appears never to have been installed.

Key Features

• Math Coprocessor: Intel C8087-3 (Ceramic with Gold Cap).
  
• Markings: i C8087-3 14030010 INTEL '80 '81
  
• Speed: 5 MHz (Standard for 8086/8088 systems).
  
• Interface Board: Intel iSBC 309 Memory Extension Multimodule.
  
• Part Number: PWA 144179-003 REV D.
  
• Serial Number: XP 13303.
  
• Date Code: 1984 (Week 18/41 marked on board components).
  
• Original Documentation: Includes "iSXM 101 Module and 8087 Installation Instructions" and schematic references.
  
• Packaging: Original Intel "SXM 101" cardboard box with matching serial number label (XP 13303) and date Oct 12 1984.
  

Technical Specifications

• Compatibility: Designed specifically for Intel Multibus systems (e.g., System 310, 320, 330, 380) or iSBC baseboards that support Multimodule expansion.
  
• Function: Offloads mathematical calculations from the main CPU, significantly speeding up scientific and engineering applications.
  
• Board Type: Multimodule (plugs into a host iSBC board).
  

New old stock/open box. Original 4 strips of tape securing the box was cut by us for inspection.

From an MIT, Draper Laboratory estate here in New England. In excellent/like new cosmetic condition with minor signs of wear consistent with age. Possibly new old stock/open box but is being sold as “used” out of an abundance of caution. Functionality has not been tested due to limitations of equipment, expertise, or time. Includes our satisfaction guarantee described in this listing’s description.Feel free to contact us with questions or offers.

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• Your order will be shipped within 1 business day.
  
• It will be packed with attention and care.
  
• We respond to messages within 1 business day. Hours of operation Monday-Friday 8AM to 4PM Eastern time (UTC -5).
  

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