A plurality of memory types are distinguished from one another in memory systems containing a plurality of memory types by applying an input signal to the memory system containing the plurality of memory types and detecting differing outputs from the plurality of memory types during a predetermined time period after the input signal is applied. Extended data output (EDO), dynamic random access memories (DRAM) are thereby distinguished from fast page mode (F/P) DRAM. Similarly, nonvolatile memory such as DRAM interface flash memory (DIFM) are distinguished from conventional DRAMs.