Have you tried just setting the programming outputs from the UNO to inputs?
My problem is that I have to disconnect the ISP programming pins from the Arduino to the ATtiny to allow I2C to work.
So you are saying that the TinyISP sets the ISP pins to inputs after uploading the code to the ATtiny
and that any connections on the ATtiny using those same pins (I2C) to a real-time clock should be able to function?
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