There is economics and there is emotion value. I assume your parents are going by economics. A repaired older device is still an older device and depending on how reliable and capable that design was, it might be near the end of its life - Sooner or later needing replacement anyway… And then there is emotional value. I get it - I like antique radios. And one that ties in with my family history is special… Here is a suggestion - Offer to pay for the repair yourself or in chores if you don’t have a job. They would likely agree to this. But also remember that things are still things and not people - They are replaceable. You will go through many possessions in your life - Some will be special to you. Honor those but don’t be a slave to them.

You can get a new computer and still keep the "Sentimental" computer. Unless you're afraid of hurting the feelings of the old computer.