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Texas Instruments TI-45 (1^st design)

Date of introduction: January 13, 1978 Display technology: Fluorescent

New price: DM 115.00 (SRP 1978) Display size: 8 (5 + 2)

Size: 5.8" x 3.1" x 1.4"
148 x 78 x 36 mm³

Weight: 5.0 ounces, 142 grams Serial No: 476372

Batteries: BP8, BP9 Date of manufacture: wk 39 year 1978

AC-Adapter: AC9900/R Origin of manufacture: Italy

Precision: 10 Integrated circuits: TMC1983

Logic: AOS - 4 Pending Operations, 15 () Displays: Itron FG95B1

Memories: 1

Program steps: Courtesy of: Joerg Woerner

Download manual: (EU: 13.2M Bytes)

At first glance is the European TI-45 identical to the SR-40. Surprisingly the TI-45 features a green vacuum fluorescent display (VFD), a major exception in the Majestic-line.

TI-45_PCB.jpg (44975 Byte)Dismantling this TI-45 manufactured in September 1978 by Texas Instruments in their Rieti, Italy facility reveals a slightly more complex design than the SR-40 sporting a red LED display. Main reason is the higher operating voltage of the VF-Display, engineers at Texas Instruments are using a very effective way to generate -22 Volts out o the 9V battery with a simple voltage multiplier using just four diodes and four capacitors and an charge-pump oscillator integrated on the TMC1980 single-chip calculator circuit.

ti-45_1.jpg (45685 Byte) Two variations of the TI-45 were reported, they differ in the mask over the display. View the later model with a molded TI-logo and TEXAS INSTRUMENTS nameplate here.

Even some TI-30 and TI-57 used this type of display mask.

Don't miss the rare model 45 and TI-30/super manufactured for Koh-I-Noor Hardtmuth.

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

ƒD Joerg Woerner, December 5, 2001. No reprints without written permission.