Re: Raspberry Pi as a storage device for a PET.
My concern with the circuitry around T1/T2 is more with T1 possibly not turning off fully when the Raspberry Pi is sending a logic 1; although I decided to trust the original design, at least for the first version I tried in BCP. I did take the slight liberty of adding a Zener diode across R2.
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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