btw. A1200 was a really mild state. Have a look at my "Extreme refurb" series -> https://retrohax.net/?s=extreme
Those machines were a bit harder to fix lol :D
Thank you for kind words.
Regarding learning, basics are out there on the Internet but it all required a lot of testing, so yes, trial and error approach.
Thank you everyone for warm words. Such feedback means a lot to me :)
More of this kind of refurbs are on my blog already -> https://retrohax.net/?s=extreme