MD-21
Control Techniques Mentor II Co-Processor Option Card

The MD21 was a predecessor coprocessor to MD29, primarily used to extend the functionality of both the Mentor I (Quantum II) and Mentor II ( Quantum III ) DC Drives. At times it was also used with the Vector and CDE drives series but to a lesser degree.

The MD21 used the Intel 8032 or 8052 microprocessor. An MD21 always contained a program in the EPROM located in the left socket. There was always a rudimentary communication program residing in this EPROM that permitted programs like CTFile, Mentor View, Mentor Access or DriveView to be used to extract Drive parameter data or assist with configuration. In addition to this communication facility, a few so called “Standard Apps” (Standard Applications) were created by Control Techniques such as a general purpose PID Loop, S-Ramp Accel/Decel, Digital Lock w/Adjustable Ratio, Spindle Orientation, Constant Tension Center Winder.