avstar piperModel: Avstar Piper
Battery: 2 x LR43
Year: 1981
Chip:  TPO328
This Piper "Flight Computer" gives you an example of using existing products like the TI-35 for other purposes. We know similar approaches from the insurance business (view the TI-58 manufactured for Lloyd) but this one uses a specialized integrated circuit to perform different computations and conversions:

 Alt/AS: Calibrated, True Airspeed, Pressure, Density Altitude
 WIND: Wind Speed, Direction, Course and Heading 
 TSD: Time-Speed-Distance, Distance and fuel consumption
 CMP: Computes in the above modes the different values
CNV: Convert between US and SI-units
 T: Time calculations