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Re: usbasp / mac os x

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The pull-up or pull-down resistor on D+ is not so relevant, it should prevent stray interrupts when the computer is not connected.

You can verify clock and crystal settings with a test loop, e.g.:
    for (;;) {
        toggle_port_pin();
        int i;
        for (i = 0; i < 1000; i++) {
            _delay_ms(0.5);
        }
    }

This should generate a 1 Hz signal on the port pin. You can check it with an LED.

The error message is very generic: It means that USB does not work at all (except the pull-up resistor). So it can be almost anything...

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