1. A digitally controlled robot comprising: an arm having a plurality of joints; each of said joints being driven by an electric motor drive; a power amplifier operable to supply drive current to each joint drive motor; respective feedback control loop means for respectively controlling said power amplifiers for said joint drive motors; each of said feedback control loop means including at least digital position, velocity and torque control loops operable to control the associated power amplifier; servo control means for performing control support tasks and calculation tasks for at least said torque control loop for all of the joint motors; said torque servo control means including a first microprocessor for digitally performing calculation tasks including computing output motor voltage control commands from input torque commands and current feedback and from stored algorithms for said torque control loop for each joint drive motor; said first microprocessor having a relatively high computing performance capability and a relatively low data processing interface capability; said torque servo control means further including a second microprocessor for supervising the operation of said torque servo control means and performing servo control support tasks in said torque control loop for each joint drive motor; said second microprocessor having a relatively high data processing performance capability; means for interfacing said first and second microprocessors relative to each other and relative to higher and lower level control circuitry so as to enable said torque servo control means to operate said torque control loop for each joint drive motor and provide torque control for each joint drive motor; said lower level circuitry including respective digital pulse width modulating means for generating joint drive motor control signals for application to said power amplifiers for the respective robot drive axes; means for sensing motor drive current for each drive axis and for generating corresponding digital current feedback signals; means for coupling said second microprocessor to higher level control looping to receive torque commands for execution and to send status data; means for operating said second microprocessor to control said interfacing means so as to send torque commands to said first microprocessor and receive calculated voltage commands from said first microprocessor; and means for operating said second microprocessor to apply the voltage commands to said pulse width modulating means for execution and for synchronously receiving said motor current feedback signals.