2M bit, 5-volt Read and 5-volt Write Flash, Bottom Boot From old datasheet system 2-megabit 256K x 8/ 128K x 16 5-volt Only CMOS Flash Memory 128K X 16 FLASH 5V PROM, 90 ns, PDSO44 2-megabit 256K x 8/ 128K x 16 5-volt Only CMOS Flash Memory 128K X 16 FLASH 5V PROM, 90 ns, PDSO48