Delete comment from: Ken Shirriff's blog

Amaury said...

it sure looks like those boards were using vias. in your closeup with 3 chips, you can see lines stopping in the middle to what looks like a small circle.
also, there are plenty of those lines seemingly going nowhere, but you can make what looks like continuation lines on the next layer down, in particular they are very visible on this one
https://photos.google.com/share/AF1QipM5GGA8K7bCldhCmk1cb4VmuAQhkSuugSWaGfWxEBqAg0rjA6k-Gt4dJraT0bnZOQ/photo/AF1QipPEBaWIAhA19leUg6cH7E-DvNx3cY7dttN8SGxT?key=WktYZTdXZmlvZGw4MzhmZWV0eFhTdzNWbGNzTm13

Oct 12, 2020, 6:30:06 AM

Posted to Inside a Titan missile guidance computer