Texas Instruments TI-45 (1st 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 T
EXAS 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 Woerner, December 5, 2001. No reprints without written permission.