I think the total cost was about $500. The DC to DC power
supply alone cost me about $300. It had no hard disk as
it ran off a 3.5 inch floppy drive with FAA airport data base
and all. The monochrome six inch  monotor cost me about
$40 bucks surplus. The 386SX mother board was under $100. 
 
Paul Lamar
 
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