Ok, I can only answer a few, and correct me if I'm wrong..
Difference between SX and DX, i.e 386SX ,386DX and 486SX, 486DX, is that SX models comes without a math co-processor, while the other is already have..
and the meaning of the EEPROM - I think is Electrically Erasable Programmable Read-Only Memory usually is designed for BIOS chip, CMOS...
just my two cents..
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