I believe the C65 specifies it to be 5V TTL.
Beiträge von mega65 im Thema „Serial port?“
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Yes, that is our current expectation, that we will implement the C65 UART, the same way the C65 did: When you set the registers to turn the UART on, it takes control of several pins that are normally controlled by the CIAs on the user port.
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Hello,
Yes, we are intending to implement the C65’s serial port that shares pins on the User port, but is a real UART. From memory, it explicitly supports MIDI baud rates.
Paul.