[Elecraft] [KPA500] Rear power switch thread

[ab2tc]

Hi all,

Choosing EEPROM for nonvoatile storage was the right choice then and still
is. Please don't even entertain a single thought about going back to a
battery backed up RAM solution (remember PC BIOS settings in "CMOS"?). It
has infinitely more problems than an EEPROM based solution. I really have no
idea what people are complaining about. I don't think there are any products
out there anymore relying on battery backed up CMOS RAM, thank God. There
are many ways to improve (if improvements are indeed needed) the power loss
reliability of non-volatile storage, such as fallback on a second copy
should the first one fail (you do use checksums, right?)

AB2TC - Knut


wayne burdick wrote
> 
> The K3 (like the K2 and our other rigs) uses EEPROM for nonvolatile  
> parameter storage. This decision was based on several criteria, and we  
> believe it was the right choice at the time. It's conceivable that in  
> a future product we might go with battery-backed-up RAM.
> 
> The MCU does try to write all changed parameters to EEPROM in the  
> event of power disappearing suddenly; the electrolytic capacitors do  
> hold up the MCU's voltage for some milliseconds. But your humble  
> firmware guy is a lot happier when power is turned off at the radio  
> first, allowing a clean shut-down sequence.
> 
> Thanks for your tolerance of our various idiosyncrasies.
> 
> 73,
> Wayne
> N6KR
> 
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