3 ms·
The DC voltage supply on the Commodore side looks like 5V, and at a guess, the TTL probably runs at that voltage too. The Pi won't be happy with more than 3.3V
by khedoros1 10y ago
The DC voltage supply on the Commodore side looks like 5V, and at a guess, the TTL probably runs at that voltage too. The Pi won't be happy with more than 3.3V on its UART pins, so the USB adapter also fills the purpose of a voltage adapter.
- a1k0n 10y agoRight. I thought it might be 5v tolerant on the RX pin but maybe not.. easy enough to just use a resistor and a diode to the 3.3v supply to level shift there, and the 3.3v TX should be fine for a 5v logic input.