NEC (uPD) - 16 Megabit

How do I read the type number?

42S18160-A60
^^----------------- 42 = NEC DRAM
                    48 = NEC CMOS Application Specific Memory
42S18160-A60
  ^---------------- Power consumption:
                    S = low power / (blank) = normal
42S18160-A60
   ^--------------- 1 = 16 Megabit chip
                    4 = 4  Megabit chip: see above
42S18160-A60
    ^-------------- 8 = 1K refresh
                    7 = 2K refresh
                    6 = 4K refresh
42S18160-A60
     ^^------------ Internal Organization: 
                    10 = 16Meg x 1
                    16 = 1Meg x 16
                    40 = 4Meg x 4 
                    80 = 2Meg x 8
42S18160-A60
       ^----------- 0 = Fast Page
                    5 = EDO
42S18160-A60
         ^--------- A = 3,3volt / (blank) = 5volt
42S18160-A60
          ^^------- Speed: 50=50ns / 60=60ns / 70=70ns