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Specifically, what are those two modules in the middle of each? I'm not too familiar with components this old. I've figured out that they're sticks of SEC SDRAM, but I've found nothing about any of the components. I also haven't seen any pictures of SDRAM with those two modules. enter image description here

  • 1
    The ICs in the middle are claimed to be buffers/bus drivers. Easily searchable.
    – dave
    Commented Jan 3, 2022 at 0:26
  • 14
    "this old"? Those probably come from a Pentium class machine. Around here, that should count as recent... ;-) Commented Jan 3, 2022 at 15:14
  • 5
    I know it's not "that" old I'm just young and didn't know how else to word it lol.
    – truehd
    Commented Jan 3, 2022 at 16:39

1 Answer 1


Despite the 144 pin DIMM form factor, this is not a SDRAM, but an EDO module with 16 MiB capacity.

The used RAM chips are

  • KM48C2104 (KM48 marks RAMs)
  • Manufactured by Samsung, of
  • 16 MiBit Capacity
  • EDO-RAMs, with
  • 2Mi by 8 Organization and
  • 60ns speed (the -6 marking)

They are not SDRAM, as such would be numbered as KM48Sx with X being L for 66 MHz and H for 100 MHz.

The additional chips, 74FCT162244 are 16 bit line driver, organized as 4 independent groups of 4 drivers each.

  • 3
    @truehd those drivers are quite nice the moment one notes their timing parameters :))
    – Raffzahn
    Commented Jan 3, 2022 at 17:03
  • 1
    IDT stuff tends to be Quite Nice (and Not Cheap) Commented Jan 3, 2022 at 21:52
  • @MichaelGraf True, then again, those line drivers are rather generic, developed and manufactured by many suppliers.
    – Raffzahn
    Commented Jan 3, 2022 at 23:12

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