Where , when , and what was the megaton amount ?
I’d be interested to know where as well. I’ve never read of any actual EMP blasts done over cities. The only ones I’ve heard of were the original open air blasts done before they knew about EMP. In those cases there was minor damage observed in Hawaii when the blast was in AZ.
There has been some other testing done with non-nuke EMP. The test methodology was questionable since they used borrowed vehicles to determine the damage. The vehicles had to be returned fully operational.
LOTS AND LOTS AND LOTS AND LOTS....Clicky linky for multi-megaton nuclear explosions
Number of electronics effected: zero.