The 79C0408 from Data Device Corporation is a Space Qualified Memory with Storage Capacity 4 Mb, Read Access Time 120, 150, 200 ns, Write Access Time 10 ms, Radiation Dose 10 krad, 25 krad, 40 krad, 60 krad, Mass 10 gms, 23 gms. More details for 79C0408 can be seen below.