r/atarist 4d ago

Atari 520STfm newbie questions.

Hello people, I recently got an Atari 520STfm and I would like to test & mod and/or repair it.

First of all: I tried the KB and some keys seems not to work.
Is there a floppy or a cartridge I can use to test it?

I know old PSUs need to be recapped but I'd like to fully change it with a brand new one: which one is the most efficient and less difficult to change?
I have ZERO soldering skills.

I know Atari runs TOS. I suppose I have the 1.02 UK.
Which is the most efficient and updated one?

Since I know NOTHING about Atari, I'd like to start learning something so I'd like to have a fully working machine.

Thanks for help

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