* **address**: System status ''address'' (0 to 255).
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===== Return Value =====
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Return a supported CUBLOC system status value. ''Sys(0)'' returns the most recent actual UART write count. ''Sys(1)'' returns the most recent actual UART read count. ''Sys(2)'' and ''Sys(3)'' return ''0'' because the vendor docs mark them unused. ''Sys(4)'' returns ''1'' while an EEPROM byte write is in progress, otherwise ''0''. ''Sys(5)'' returns a 10 ms timer that wraps at 65535. ''Sys(6)'' returns ''micropython.stack_use()''.
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===== Exceptions =====
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* [[https://docs.micropython.org/en/latest/library/builtins.html#TypeError|TypeError]]: ''address'' is not an integer.
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* [[https://docs.micropython.org/en/latest/library/builtins.html#ValueError|ValueError]]: ''address'' is outside 0 to 255.
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* [[https://docs.micropython.org/en/latest/library/builtins.html#NotImplementedError|NotImplementedError]]: ''address'' is not supported by this implementation.