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.
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.