Motorola 14500B(MC14500B) A 1-bit {ICU} from {Motorola}. Probably the limit in small processors, the 14500B had a 4-bit instruction and controlled a single data read/write line, used for application control. It had no address bus - that was an external unit that was added on. Another {CPU} could be used to feed control instructions to the 14500B in an application. It had only 16 pins, less than a typical {RAM} chip, and ran at 1 {MHz}. (1994-11-30)