DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
RFT minirex 75
| Date of introduction: | Display technology: | LED-modules | |
| New price: | Display size: | 8 | |
| Size: | 5.5" x 3.2" x 1.3" | ||
| Weight: | 11 ounces | Serial No: | 017790 |
| Batteries: | 4*NiCd | Date of manufacture: | year 1975 |
| AC-Adapter: | Origin of manufacture: | GDR | |
| Precision: | 8 | Integrated circuits: | TMS0105 |
| Memories: | |||
| Program steps: | Courtesy of: | Joerg Woerner |
The
minirex 75 manufactured in the GDR (German Democratic Republic) end of the year
1975 looks similar to other calculators based on TI's calculator chips. Compare
it e.g. with the famous Bowmar 901B. The minirex 75 seems
to be the successor of the minirex 74.
The
minirex 75 uses a charging cradle as a comfortable stand during operation and
to charge the four internal NiCd-batteries.
From
the technical point the inside of the minirex 75 is from higher interest than
the awful appearance. The TMS0105 calculator chip seems to be the one and only
western component. The round NiCd-cells look very unfamiliar, the display driver
chips are GDR copies of the western SN75491 and
SN75492. Even the transistors,
resistors and capacitors look different from US products.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.