Texas Instruments (TMS) - 4 Megabit

How do I read the type number?

TMS44100DZ-60
^^^---------------- TMS = Texas Instruments
TMS44100DZ-60
   ^^-------------- ?
TMS44100DZ-60
     ^^------------ Interne Architectuur: 
                    10 = 4Meg x 1 / 1K refresh
                    16 = 256K x 16 / 1K refresh
                    40 = 1Meg x 4 / 1K refresh
TMS44100DZ-60
       ^----------- 0 = Page Mode
                    5 = Page Mode (2WE)
                    9 = EDO
TMS44100DZ-60
        ^^--------- Chip Revision
TMS44100DZ-60
           ^^------ Speed: 50=50ns / 60=60ns / 70=70ns