High speed 120 ns CMOS 1 Megabit programmable and erasable ROM 128K x 8 BIT flash PEROM High speed 150 ns CMOS 1 Megabit programmable and erasable ROM 128K x 8 BIT flash PEROM High speed 200 ns CMOS 1 Megabit programmable and erasable ROM 128K x 8 BIT flash PEROM High speed CMOS. 1 Megabit programmable and erasable ROM. 128K x 8 bit flash PEROM. Access time 120 ns. High speed CMOS. 1 Megabit programmable and erasable ROM. 128K x 8 bit flash PEROM. Access time 200 ns. High speed CMOS. 1 Megabit programmable and erasable ROM. 128K x 8 bit flash PEROM. Access time 150 ns.