DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
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 |
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| 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.
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.
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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.