The present invention discloses methods and systems of accomplishing I/O-based redundancy for a memory device that includes two-bit memory cells. The memory device includes a core two-bit memory cell array and a redundant two-bit memory cell array. The configuration of the core two-bit memory cell array is non-uniform such that the two-bit memory cells therein are not arranged in a sequential order. Due to the non-uniform configuration, I/O based redundancy is accomplished by decoding the addresses with a redundant Y-decoder circuit and translating the addresses using an address translation circuit. The translated addresses identify the location of the two-bit memory cells within the non-uniform core two-bit memory cell array. The decoding of the addresses configures the redundant two-bit memory cell array to provide a configuration that matches the two-bit memory cells in the location identified by the translated address.