Did some work at Kirtland AFB in the 90’s with the HPD II and ARES. It’s harder to fry stuff than some folks think.
Although not EMP related, we hit a car with high power microwaves and all it did was wipe out the radio presets.
“It’s harder to fry stuff than some folks think.”
We really don’t know what the impact will be. There are too many variables to simulate, and testing may or may not represent real-world type scenarios.
We DO know that there are many vulnerabilities and some percentage of them will cause failures.
We’re slowly working to remedy this.