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On a Sun Ultra 5 keyboard and screen are used as default input/output devices. This causes the serial port not to be used by default, at least not unless you send a keypress over an attached terminal. To change this behaviour, two values need to be changed in OpenBoot. So first we need to enter OpenBoot by sending a Break over the serial line or STOP-A. Examine the environment values like this and look out for the variables called 'input-device' and 'output-device': # printenv Variable Name Value Default Value [output omitted] output-device screen screen input-device keyboard keyboard [output omitted] Set them as follows to enable the serial console to be used by default: #setenv output-device virtual-console #setenv input-device virtual-console Next time the machine is powered on, the serial console should come up at once.

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