Using advanced packaging techniques Bulk, high reliability is ensured. 50MHz Hz is the frequency at which the CPU operates. To learn about the functions of the pins 208 please refer to their datasheets. There are many applications that use the CPU with Surface Mount mounted. 3V is the CPU core voltage.
SB80486DX2SC50SX920 Features
SB80486DX2SC50SX920 Applications
There are a lot of Intel SB80486DX2SC50SX920 Microprocessor applications.