DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Homeland-8109 by Toshiba
| Date of introduction: | 1977 | Display technology: | Fluorescent |
| New price: | Display size: | 8 | |
| Size: | 5.3" x 3.1" x 0.8" 135 x 79 x 20 mm3 |
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| Weight: | 3.8 ounces, 108 grams | Serial No: | 128711 |
| Batteries: | 2*AA | Date of manufacture: | year 1979 |
| AC-Adapter: | BH-310 (100V) | Origin of manufacture: | Japan |
| Precision: | 8 | Integrated circuits: | TMS1045 |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
Tokyo
Shibaura Electric Co., Ltd., better known as Toshiba - the official name since
1978 - introduced early in their history the Homeland brand.
The Homeland 8109 replaced soon the 8105 with more or less identical functionality but even lower manufacturing costs. Its sibling Homeland 8009 traded the 4-key memory for the Pi function.
Dismantling
the Homeland 8109 reveals with the TMS1045 the successor of the TMS1071 found in
the Homeland 8105. Main reason is the simplifies schematics of the calculator,
just compare the two printed circuit boards (PCBs) of the calculators.
Texas Instruments used the same chip pair in the TI-2550 II and TMS 2550 III.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, February 29, 2004. No reprints without written permission.