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Understanding RAM chip numbers: IBM

Link naar de fabrikant. Link to the manufacturer.

Sample Explanation

 16 Mb Chip organised as: 1M x 16 bits
1K refresh, Extended Data Out (EDO)
Speed = ??ns, Supply = 5 Volt
16 Mb Chip organised as: 2M x 8 bits
2K refresh, Extended Data Out (EDO)
Speed = ??ns, Supply = 5 Volt

IBM (IBM) - 4 Megabit

IBM014400J1F
^^^---------------- IBM = IBM
IBM014400J1F
   ^^^------------- 014 = 4 Megabit chip
                    011 = 16 Megabit chip: see below
                    016 = 64 Megabit chip
IBM014400J1F
      ^^----------- Internal Organization: 
                    40 = 1Meg x 4
                    80 = 512  x 8
                    16 = 256 x 16
IBM014400J1F
        ^---------- 0 = Fast Page Mode
                    5 = EDO

IBM (IBM) - 16 Megabit

How to read the part number:

IBM0116405BT1E
^^^---------------- IBM = IBM
IBM0116405BT1E
   ^^^------------- 011 = 16 Megabit chip
                    014 = 4 Megabit chip: see above
                    016 = 64 Megabit chip
                    025 = VRAM chip: see below
IBM0116405BT1E
      ^------------ 8 = 1K refresh
                    7 = 2K refresh
                    6 = 4K refresh
IBM0116405BT1E
       ^^---------- Internal Organization: 
                    40 = 4Meg x 4
                    80 = 2Meg x 8
                    16 = 1Meg x 16
IBM0116405BT1E
         ^--------- 0 = Fast Page Mode
                    5 = EDO
IBM0116405BT1E
          ^-------- (blank) = 5 volt
                    B = 3,3 volt
                    M = 5 volt low power
                    P = 3,3 volt low power
IBM0116405BT1E
               ? -- Speed: 50=50ns / 60=60ns / 70=70ns

IBM (IBM) - VRAM Chips

How to read the part number:

IBM025170LGB-60
^^^---------------- IBM = IBM
IBM025170LGB-60
   ^^^------------- 025 = VRAM (size see further down)
                    011 = 16 Megabit chip: see above
                    016 = 64 Megabit chip
                    014 = 4 Megabit chip: see above
IBM025170LGB-60
      ^^^---------- Internal Organization: 
                    160 = 256K x 16 Multiport VRAM (4M bit): check module size
                    161 = 256K x 16 Multiport VRAM (4M bit): check module size
                    170 = 256K x 16 Multiport VRAM (4M bit): check module size
                    171 = 256K x 16 Multiport VRAM (4M bit): check module size
IBM025170LGB-60
         ^--------- N = 3,3 volt
                    L = 5 volt
IBM025170LGB-60
             ^^---- Speed: 50=50ns / 60=60ns / 70=70ns

Link naar de fabrikant. Link to the manufacturer.

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