This is rather timely, as I recently picked up an EL-5100S (not sure what the S version added, if anything). An EL-5100 was my weapon of choice during my brief stint as an electrical engineering student.
I think the S version had a silver-tinted LCD (?) rather than the yellow LCD used on the EL-5100. I don't know if this version fared any better with the dreaded screen rot issue. My EL-5100 from 1980 (which I also used extensively in my engineering classes) is fortunately still working and very legible, with very little degradation.
I hadn't seen this application book before, thank you for posting!
Steve
(11-10-2021 04:26 AM)srk00 Wrote: [ -> ]I think the S version had a silver-tinted LCD (?) rather than the yellow LCD used on the EL-5100. I don't know if this version fared any better with the dreaded screen rot issue. My EL-5100 from 1980 (which I also used extensively in my engineering classes) is fortunately still working and very legible, with very little degradation.
I hadn't seen this application book before, thank you for posting!
Steve
This one does have the silver-backed LCD vs. the yellow. However, in browsing eBay listings, I did see at least a couple EL-5100 without the "S" designator that had silver-colored LCDs. (I checked the item photos, not just the listing heading).
Not sure on other silver-backed ones for longevity, but I can see a little faint darkness trying to creep into the top-left side of my display.