DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
Corvus 400
| Date of introduction: | September 1974 | Display technology: | LED-stick |
| New price: | $39.95 | Display size: | 8 |
| Size: | 5.0" x 3.0" x 0.9" | ||
| Weight: | 3.7 ounces | Serial No: | 400-016025 |
| Batteries: | 4*N cells | Date of manufacture: | mth 12 year 1974 |
| AC-Adapter: | 6V DC, 75mA | Origin of manufacture: | USA |
| Precision: | 8 | Integrated circuits: | Mostek MK50280A |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Peter Muckermann |
The
keyboard design of the original Corvus 400 was
changed within a few months from white to brown function keys. We are not sure
if the changes of the LED display discovered with this Corvus 400 calculator
manufactured in December 1974 correlate to the keyboard colors. Everything else
seems to be identical to the first edition of the calculator, we still located a MK50280A single-chip calculator circuit and one digit driver circuit.
Learn more about Mostek Calculator Integrated
Circuits.
The later Corvus 400
makes use of the
MK50282A calculator circuit instead the MK50280A chip. The differences 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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, October 17, 2002. No reprints without written permission.