I always assumed that the naming of the top most keys on a standard keyboard, F1 ~ F12 were somewhat similar to how drives work. That being, drives are labelled starting from C:, then to D:, then to E:, etc.
What was the idea behind picking the letter F for the keys at the top? I've noticed extra mouse and keyboard peripherals that continue this trend by labelling their keys G, and so forth. Is there any reason why they didn't start at A1, A2, etc. etc.?