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| Awake | Z80 clock running and display on. |
| Snooze | Z80 clock stopped and display on, ie. waiting for keyboard activity. |
| Doze | Z80 clock running and display off, ie. programming EPROM .and Flash cards |
| Coma | Z80 clock stopped and display off, ie. machine shut down. |
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V4.0 of the OZ operating system automatically recognises the machine as expanded if the Z88 has been upgraded with 128K or more of internal (slot 0) RAM (replacing the original 32K RAM chip). However this requires soldering work on the motherboard. The V4.2 and newer releases of the OZ operatiing system also sets the expanded machine state if 128K or more RAM is inserted in slot 2.
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