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ZBasic System Library 188 ZX Microcontroller Family For devices based on the ATmega chips, the default zero-crossing interrupt is INT0 as shown in the table above. If desired, an alternate interrupt may be specified using the Option X10Interrupt directive described in the ZBasic Language Reference Manual. Compatibility This subroutine is not available on ZX models that are based on the ATmega32 processor (e.g. the ZX- 24) or the ATmega128. Moreover, it is not available in BasicX compatibility mode. See Also CloseX10, DefineX10, StatusX10