I'm a vintage calculator collector and it's always fun to see how calculators went from extremely repairable in the 60s-70s to impossible to repair in the 90s (

I'm a vintage calculator collector and it's always fun to see how calculators went from extremely repairable in the 60s-70s to impossible to repair in the 90s (like an iPad.) This is partly due to the fact that some vintage calculators cost thousands or tens of thousands of dollars when they were introduced. I was repairing a scientific calculator from the 70s yesterday, and literally every component could be repaired. You could actually order parts (new keys, new display, new faceplate, etc.) from the company. This is in contrast to a calculator of the mid 80s which usually had four screws but was difficult to repair or a calculator of the 90s and later that was usually a sealed unit (with everything on one chip.) It seems the same thing is happening to computers, with a timescale delayed 20 years.