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Link to the manufacturer.

Fujitsu (MB) - 4 Megabit

Fujitsu (MB) - 16 Megabit

How do I read the type number?

MB81V17405A-60
^^----------------- MB = Fujitsu
MB81V17405A-60
    ^-------------- V = 3,3volt / blank = 5volt
MB81V17405A-60
     ^^------------ 18 = 1K refresh
                    17 = 2K refresh
                    16 = 4K refresh
MB81V17405A-60
       ^^---------- Internal Organization: 
                    40 = 4Meg x 4
                    80 = 2Meg x 8
                    16 = 1Meg x 16
MB81V17405A-60
         ^--------- 0 = Fast Page
                    5 = EDO
MB81V17405A-60
            ^^----- Snelheid: 50=50ns / 60=60ns / 70=70ns

Fujitsu (MB) - SDRAM Chips

How do I read the type number?

MB81164842A-100LFN
^^----------------- MB = Fujitsu
MB81164842A-100LFN
    ^-------------- 1 = ?
                    F = ?
MB81164842A-100LFN
     ^^------------ 64 = 64 Mega bit chip
MB81164842A-100LFN
       ^^^--------- Internal Organization:
                    164 = 4banks x 1M x 16, 3.3V
                    442 = 4banks x 4M x 4, 3.3V
                    842 = 4banks x 2M x 8, 3.3V
MB81164842A-100LFN
          ^-------- Die Revision:
MB81164842A-100LFN
            ^^^---- Speed: 
                    75  = PC133
                    100 = PC100,222 specifications.
                    102 = PC100,??? specifications.
                    103 = PC100,322 specifications.
MB81164842A-100LFN
               ^--- Power: 
                    L = Low-Power
                    (blank) = Standard power