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ZBasic System Library 197 ZX Microcontroller Family PortMask Type Function returning Byte Invocation PortMask(pin) Parameter Method Type Description pin ByVal integral A pin number Discussion This function returns a bit mask for the port with which the specified pin is associated. The resulting bit mask will have at most one bit set if the pin is valid and will be zero for an invalid pin. The bit mask can be used for directly manipulating the I/O registers associated with a pin. Note that the value of this function is a compile-time constant if the compiler can determine the value of the pin parameter at compile-time. For further information about how to use this function, see the discussion of Register.Port() in the ZBasic Reference Manual. Example Dim mask as Byte mask = PortMask(C.2) ' the result will be &H04 Compatibility This function is not available in BasicX compatibility mode.