PicoMite VGA - USB to PS2 Keyboard Adapter

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Mixtel90 Guru Joined: 05/10/2019 Location: United Kingdom Posts: 9179	Posted: 10:06am 18 Feb 2024       The "CMM1.5" USB system works very nicely in my experience. In fact, PicoGAME won't have a PS2 socket. It will expect a USB keyboard, which can be plugged into the USB-A socket. You *can* use series resistors and a "safety" diode up to 3V3 to connect a 5V PS2 keyboard to a Pico instead of a proper level shifter - I've done it. I used 270R with BAT85 Schottky diodes for my original PicoMite VGA board. IIRC that resistor value was one used by HP or someone like that for connecting to a 3V3 FPGA. The diodes are important - don't use ordinary silicon types like 1N4148. I swapped to proper level shifters because it's probably safer in the long run. :)