baum:
So PB2 is the TX (to computer) pin?
Processor clock is 1 MHz or 8 MHz... On the x5 processor, the Serial transmit pin is PB3 / pin 3
Processor clock is 16 MHz... The Tiny Debug Serial pin moves to the other side of the processor (PB2 instead of PB3).
If I plug that into Arduino's RX and then write values over usb, I can debug ATtiny?
I suggest you...
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Upload an empty Sketch to the Arduino.
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Either remove the processor from the Arduino or hold the processor in reset (connect a wire from RESET to GND).
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Include a series resistor (about 220 ohms will work well) between the ATtiny and the Arduino.
If the Arduino tries to communicate over the serial port at the same time as the ATtiny processor, a short-circuit is the result. Doing the three things above will ensure that does not happen.
It looks like the labels are from the perspective of the processor. If they, you use the TX pin (pin 1).