Toshiba (TC) - 4 Megabit

How do I read the type number?

TC51V4400CSJ-60
^^^---------------- TC5 = Hitachi Memory
TC51V4400CSJ-60
   ^--------------- 1 = OK
                    2 = VRAM : See below Click here 
TC51V4400CSJ-60
    ^-------------- V = 3,3volt / (blank) = 5volt
TC51V4400CSJ-60
     ^------------- 4 = 4  Megabit chip
                    1 = 16 Megabit chip                    
TC51V4400CSJ-60
      ^^----------- 26 = 512 refresh
                    40 = ?? refresh (probably 1K)
TC51V4400CSJ-60
      ^^----------- Internal Organization: 
                    26 = 256K x 16
                    40 = 1Meg x 4
TC51V4400CSJ-60
        ^---------- 0 = Fast Page
                    5 = EDO
TC51V4400CSJ-60
             ^^---- Speed: 50=50ns / 60=60ns / 70=70ns