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Project: https://www.hackup.net/2018/07/pi1541io-revision-4/ Bougth from PCBWay: https://www.pcbway.com/project/shareproject/Pi1541_IO_Adapter__Rev_4.html
For the Option B schema the following components have been added: One Hex Inverter 7406 2 Pull Up resistors 1K 1 Ceramic capacitor 100nF (not used) I decided to do
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Raspberry Pi 3 Model B+ Bidirectional Level Shifter 4 channels (3.3v <-> 5v) Few cables One Led Prototypes board Opinionated soldering skills Thanks to https://cbm-pi1541.firebaseapp.com/ https://mygeekyhobby.com/2018/08/12/pi1541-in-30min-with-almost-no-soldering/