Serial flash memory, nor flash memory, nand flash memory, Non-Volatile SRAM

 MX29F Series 5 V 4 Mb (512k x 8) 70 ns Surface Mount Flash Memory - PLCC-32

https://www.futureelectronics.com/p/semiconductors--memory--flash--norflash--nor/mx29f040cqi-70gtr-macronix-4058675