Texas Instruments TI-1265 distributed by HEMA

Date of introduction:  1976 Display technology:  Fluorescent
New price:   Display size:  8
Size:  5.5" x 2.8" x 1.4"
 138 x 70 x 35 mm3
Weight:  4.5 ounces, 127 grams Serial No:  
Batteries:  9V  Date of manufacture:  wk 12 year 1977
AC-Adapter:  AC9180 Origin of manufacture:  Italy (RCI)
Precision:  8 Integrated circuits:  TMS1043
Memories:  1    
Program steps:   Courtesy of:  Hans Bloemen / Marie Lisa Collas

Nothing else than a TI-1265 with another sticker. The brand reactor was used by the Dutch department store HEMA.

We know with the TI-1025, TI-1250, and TI-1265 three different Texas Instruments calculators sold by HEMA under there own label.

Dismantling the featured TI-1265 with Date code 0977 LTA and manufactured in March 1977 in Lubbock, Texas reveals indeed a much more complex design than a TI-1250 manufactured in the same timeframe and having similar capabilities. Instead a very efficient and cost-optimized design with a single-sided printed circuit board (PCB) centered around a TMS0972 single-chip calculator circuit and no other components than an 8-digit display modules, do we recognize:

TMS1043 single-chip calculator circuit with integrated high voltage drivers, based on the TMS1000 - the World's first Microcomputer
DC/DC Converter Module to generate the high voltage (around -22V) for the Anodes and Grids of the VF-Display
ITRON 9-digit VFD Module

The TMS1043 was used with the TI-2550 III, too and sporting even [1/x], [x2] and [√x] keys.

Don't miss the rare Texas Instruments 1265 manufactured for Koh-I-Noor Hardtmuth.

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Joerg Woerner, September 19, 2002. No reprints without written permission.