>>I used to use a EPROM for storing code, but I found that some circuits use
>>flash for storing code instead. What is the difference between these two
>>ways of code storage? Which is better?
> 
> 
> Flash is electrically erasable, EPROM erases with UV light.
> Flash can be easily programmed in circuit.
> 
> This article from Michael Barr's Embedded Systems Glossary should help.
> http://www.netrino.com/Publications/Glossary/MemoryTypes.html

I have been suspecting that Flash or EEPROM are not as rugged on the 
field as EPROM.  Most likely due to surge, EPROM when it fails, it is a 
device failure.  UV does not help.  But a good percentage of Flash or 
EEPROM can be recovered through reprogramming.  Comments?

Cheers, Ling SM
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