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• CPU (SB80486DX250): This is an Intel i486DX2 32 bit  processor running at 50 MHz.

  1. The "DX2" designation indicates clock-doubling technology: it operates at 50 MHz internally while interfacing with a 25 MHz external system bus.

  2. It includes an integrated Floating-Point Unit (FPU) and 8 KB of L1 cache.

A data sheet for this device can be found at https://theretroweb.com/chip/documentation/r400-data-6672bf55eb55d066333525.pdf 

It has

• EDO/FPM DRAM controller supports from 1MB to 128MB 

• Supports L1 write-back cache 

• Two integrated 16550-compatible UARTs 

• Integrated real-time clock 

• Enhanced IDE interface or DRAM parity support 

• Keyboard and mouse controller 

• Four programmable I/O chip selects 

• ROM or flash ROM interface 

• Speaker interface 

• Watchdog Timer