* @param patch patch (readout partition) number within the slice
* @param slice sector no (0 to 35)
*/
- int InitBlock(void* ptr,unsigned long size,Int_t firstrow,Int_t lastrow, Int_t patch, Int_t slice);
+ virtual int InitBlock(void* ptr,unsigned long size,Int_t firstrow,Int_t lastrow, Int_t patch, Int_t slice);
/**
* Set the reader position to the next value.