ADE-203-311A (Z) HN27C4000G Series 524288-Word ×.
Hitachi Semiconductor
HN27C4000G - 524288-Word x 8-Bit/262144-Word X 16-Bit CMOS UV Erasable and Programmable ROM
ADE-203-311A (Z) HN27C4000G Series 524288-Word × 8-Bit/262144-Word × 16-Bit CMOS UV Erasable and Programmable ROM Rev. 1 Nov. 10, 1994 The Hitachi HN.