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Jeppesen Sanderson prostar by Texas Instruments

Date of introduction:	1982	Display technology:	LCD
New price:		Display size:	8
Size:	5.8" x 3.1" x 0.9"
Weight:	3.9 ounces	Serial No:	8708933
Batteries:	2*LR44	Date of manufacture:	wk 37 year 1983
AC-Adapter:		Origin of manufacture:	USA (ATD)
Precision:	11	Integrated circuits:	CD4575, CD4576
Memories:	2
Program steps:		Courtesy of:	Bill Wood

This Flight computer developed between the Aviation specialist Jeppesen Sanderson and calculator manufacturer Texas Instruments is based on the TI-55-II model introduced in the year 1981.

The colourful keyboard of this Flight computer makes it easy to understand the functions.

	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

Compared to the earlier avstar based on a simple TI-35 the prostar added some features:

	LAT/LONG: Latitude and Logitude mode solves great circle bearing
	WT/BAL: Weight and Balance mode calculates center of gravity

In 1985 Texas Instruments cancelled production of the TI-55-II due to problems with the display and introduced the new TI-55-III. As a result even this prostar was upgraded, view the second edition here.

Later Flight computers sold by Jeppesen Sanderson like the Techstar based on a non-TI design.

The Illinois based company Specialized Electronics Corporation (SEC) intoduced one year later the sophisticated Navtronic Explorer.

If you have additions to the above article please email: joerg@datamath.org.