The ignition module is more complicated than one might imagine. I was surprised to find two 56 pin integrated circuits inside. There are four massive Insulated Gate Bipolar Transistors on the left side. The ignition module might even be thought of as a co-processor for the ECM. The module was designed by Motorola. The lower 56 pin integrated circuit has a NCR logo on it.

The ignition module has a low failure rate. This module failed after 220k miles. There was no spark.