 However, by the time when the TeraDrive was released in 1991, this processor was almost 10 years out of date - the more powerful 25 MHz Intel 80486 had been released in 1989, making the TeraDrive's central processor 2 generations behind its time.The system also contains a Motorola 68000 and a Zilog Z80, the same processors which were used in the Mega Drive, that ran at 7.67 MHz and 3.58 MHz respectively.The machine's front panel ports included two Mega Drive pad ports which were similar in design to 9-pin male serial ports, and 2 PS/2 ports to the right side of the unit to accommodate for the mouse and keyboard.