[SI-LIST] Dark Emitting Diodes

From: Bill Grenoble <billg@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Date: Tue, 7 Apr 2009 22:04:04 -0400 (EDT)
Dark Emitting Diodes

I think it was Litton who invented the DED, in late March of '72? There 
was a writeup in Electronic Design. They modified the LED process to 
produce DEDs, but found that there were some chips that emitted red 
light instead of dark. They finally ran their normal LED processes and 
tested for DEDs - that way their yield was 100%.

The GE Turbo Encifilator appeared in their hard cover major equipment 
catalog in the late 50's, perhaps very early 60's. It was a very normal 
data sheet with a picture of one of GE's big steam turbines and a 
discussion of the wonderful things it did. The rep deneied all 
knowledge and said the people at GE weren't talking about it. Someone 
pulled a Prank, and Management was pissed!

It was 12-15 years later that Signetics announced the Write Only Memory 
using an SOS (Copyright US Army Quartermaster, 1943) process. I remember 
a graph showing the number of pins remaining vs the number of 
extractions. Also a chart of AQL for fast pay customers and slow pay 
customers. I may still have the WOM data sheet, and perhaps one of the 
writeups on the DED. There are about a dozen boxes, which may have the 
folder with the 1 Apr edition Fantastic Stories!
   Best Regards
  Bill Grenoble
  Accokeek, Maryland
  16 NM due South of the White House
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[SI-LIST] Dark Emitting Diodes

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