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M29F200B - 2 Mbit 256Kb x8 or 128Kb x16 / Boot Block Single Supply Flash Memory
M29F200T - 2 Mbit 256Kb x8 or 128Kb x16 / Boot Block Single Supply Flash Memory
M29F400B - 4 Mbit 512Kb x8 or 256Kb x16 / Boot Block Single Supply Flash Memory
M29F400T - 4 Mbit 512Kb x8 or 256Kb x16 / Boot Block Single Supply Flash Memory