Re: Raspberry Pi as a storage device for a PET.
The interface itself is very low-risk of being able to cause any damage, as it doesn't really source any current into the Tape connector. So there shouldn't be any particular power-sequencing requirements.
Although it might not be a bad idea to add around 220R in series with the 2 outputs, so that there's no direct connection (without a current-limiting resistor) on any connection other than the common Gnd pin. - But this is more to protect this interface's output transistors from being damaged due to a connection fault.
However, much more of a risk is mis-wiring / a short on the tape connector itself - particularly accidentally connecting the higher (9V) Motor-voltage output to anything else.
And I would recommend ensuring your tape connector has a key-way fitted (apparently the cheaper ones sold don't have this), to prevent it being plugged-in the wrong way round as well as aid alignment when plugging-in.
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