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
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|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(EU: 13.2M Bytes)|
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
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 TI-30/super manufactured for Koh-I-Noor Hardtmuth.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.