I own the Tactical and Strategic Missile Guidance book. I only bought it because I have a passing interest in this stuff and really couldn't believe this sort of book is publically available.
In any case, I've absolutely noticed how even a Raspberry Pi Zero, taken back 40 years, would be a supercomputer beyond anything that money could buy back then.
A GPU that we'd consider obsolescent today would be truly insane in 1985.