8-Zone Alarm System
  Product Description: 
    This unit is a eight-zone wired security system.  The project involved updating the fire siren output circuitry and software to detect a fault (open or short) in the fire siren loop as per the latest Canadian regulatory requirements.
  Designed at: 
    Tandy Electronics Design 
Sold at: 
    Radio Shack as  49-485A
    Hardware/Software Design - Doug Deeds 
    Original Hardware/Software Design - Albert Straub