DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Corvus 400
| Date of introduction: | 1974 | Display technology: | LED-modules |
| New price: | Display size: | 8 | |
| Size: | 5.0" x 3.0" x 0.9" | ||
| Weight: | 3.7 ounces | Serial No: | 400-110233 |
| Batteries: | 4*N cells | Date of manufacture: | mth 02 year 1975 |
| AC-Adapter: | 6V DC, 750mA | Origin of manufacture: | USA |
| Precision: | 8 | Integrated circuits: | Mostek MK50282A |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
The Corvus 400
calculator uses four small N-sized batteries compared to the larger AA-sized
cells of the Corvus 310 line. The result is a very small LED-type calculator
similar to the Texas Instruments TI-1500.
It uses a MK50280A single-chip calculator circuit and one digit driver circuit.
Learn more about Mostek Calculator Integrated
Circuits.
The Corvus 400 introduced the "N"-key known from desktop calculators.
It instructs the calculator to display a count of entries made in a chain. This
feature is used in obtaining averages.
Within a few month the keyboard color design was changed, don't miss the second edition of the Corvus 400. The third Corvus 400 makes use of the MK50282A calculator circuit instead the MK50280. The differences between the two chips are not yet discovered. Within some month the four unusual N-batteries were replaced with a standard 9V battery. Don't miss the Corvus 406.
The Corvus 400 was sold under the label of Radio Shack, don't miss the EC-230.
Other calculators sold under the Corvus brand are the 320,
415, 500, and 615
models.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 29, 2017. No reprints without written permission.