Four thousand four.
8008-4004=4004 (Eight thousand and eight minus four thousand and four equals 4004)
A data bus is bidirectional because the processor needs it to both read and write. Also, in the case of the 4004, the data bus was tri-multiplexed with the 12 bit address bus and the 8 bit opcode bus.
1,2,4,7,11,13,14,22,26,28,44,52,77,91,143,154,182,286,308,364,572,1001,2002,4004
I believe it was the 4004 by Intel, later the 8008 and then the 8080
ambot
4,084,080.
4004
hello
the intel 4004
improved version of 4004
4004
Days of Our Lives - 1965 1-4004 was released on: USA: 25 August 1981