[Premium-Rx] Racal RA6778 firmware listing needed,and eprom longevity...

[Mark S. Holden]

Gary Geissinger wrote:
> 
> Guys,
> 
> Peter is right on.
> 
> At my previous job a guy did the math on sunlight (and flourescent room
> light) erasing 2708 EPROMs.
> 
> It looked like 30 days of direct sunlight or 2-3 years of lab lighting
> will do the erase.  That was to meet the full erase spec.  I bet there
> is degradation much sooner than that.
> 
> We did verify that the window must be covered during programming and use
> on some EPROMS.  For example, the 'HC11 microcontroller with EPROM will
> not program correctly in lab light if not covered.  And the output will
> be wrong if operated in lab light as well.
> 
> Gary WA0SPM
> 
> 

Back in the 70's Popular Electronics (or Radio & Electronics) had a construction
article for a video camera that used an EPROM as an imaging chip.   If I
remember correctly it was called the "Cyclops".

So these things are pretty light sensitive.