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FM Towns 20F Complete Teardown

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The FM Towns PCs can be a challenge to disassemble because the physical design is very complex and uses a lot of retention clips and pressure fits that will break if you try to remove them out of order.  There are a couple of videos on YouTube and some partial guides out there that I used the first time I took one of these apart, but I wanted to make a more complete guide and try to get everything in the best order.  There are several different types of screws involved here so in many cases I made a point to take pictures of the uninstalled screws next to where they go in case you need some help remembering.  It wasn't right to be lazy and say "re-assembly is just these steps in reverse" because that's only about 97% true.  There are some steps that are better when done in a different order during re-assembly - these steps are each marked with "re-assembly" notes so be sure to read the words and not just look at the pictures! The teardown is broken down into