The TMS27C256 series are (262 144-bit), ultraviolet (UV) light erasable, electrically programmable read-only memories (EPROMs). The TMS27PC256 series are (262 ...
262 144-Bitprogrammable Read-Only Memory 28-CDIP 0 to 70. Others with the same file for datasheet: TMS27C256, TMS27C256-10JL, TMS27C256-120JL, ...