HC11-based J1850 implementation and complete interface box to communicate with the J1850 bus using the PC-Calibrator. It was requested that PC Calibrator software be expanded to include ability to record J1850 data together with all other hardware previously supported. Since J1850 protocol peripheral chips were non-existent/hard to come by at that time, the whole hardware/software was developed from scratch.

The resulting J1850 interface box was using the serial port to communicate with the PC.