Texas Instruments TI ViewScreen 85

Date of introduction:  1994 Display technology:  LCD dot matrix
New price:  $250.00 (SRP 2008) Display size:  8 * 16 characters
Size:  10.0" x 9.7" x 1.5"
 254 x 247 x 38 mm3
Weight:  29.3 ounces, 830 grams Serial No:  18001279
Batteries:  4*AAA Date of manufacture:  mth 06 year 1997 (B)
AC-Adapter:  AC9201, AC9201E Origin of manufacture:  Taiwan (I)
Precision:    Integrated circuits:  2*Toshiba T6A39A, T6A40
Program steps:    Courtesy of:  Joerg Woerner

The TI ViewScreen panel connects with a cable to the Texas Instruments Graphing calculators. Placing the panel on the overhead projector enlarges the image of the handheld screen so that each student can follow along. Don't miss the US Patent Application U.S. Pat. No. 5,168,294 with the title “Display demonstration system for providing enlarged projected image of calculator display” filed already in September 27, 1991.

The TI ViewScreen 85 was introduced in 1994 and connects to the second generation TI-85 VSC (ViewScreen Calculator) and the TI-86 VSC. It was delivered either as the ViewScreen panel package with the power supply and a carrying case or as part of the ViewScreen system including the Graphing calculator. The first generation of the TI-85 VSC was permanently connectred to a much smaller ViewScreen panel.

In 2008 three different ViewScreen panels were available:

Panel 1: TI-73 VSC, TI-73 Explorer VSC, TI-80 VSC, TI-82 VSC, TI-83 VSC,
   TI-83 Plus VSC, TI-83 Plus Silver Edition VSC, TI-84 Plus VSC,
   TI-84 Plus Silver Edition VSC
Panel 2: TI-89 VSC, TI-89 Titanium VSC, TI-92, TI-92 Plus, Voyage 200
Panel 3: TI-85 VSC (2nd design), TI-86 VSC

Dismantling the TI ViewScreen 85 reveals no surprises. A huge, transmissive LCD panel is connected to three display drivers already known from the TI-81.

The arrangement of two Toshiba T6A39A column drivers and one T6A40 row drivers found in the TI ViewScreen 85 is obvious from the layout of the printed circuit board (PCB).

The Presentation Link Adapter connects the student versions of the TI-84 Plus family to the ViewScreen panel using the calculator's USB port.

With the phase out of the overhead projectors from the daily life, Texas Instruments developed with the TI-Presenter a perfect replacement for the ViewScreen panels based on modern video technology.

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© Joerg Woerner, September 5, 2007. No reprints without written permission.