DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
Corvus 525 a.k.a. CheckMaster
| Date of introduction: | 1975 | Display technology: | LED-modules |
| New price: | $39.95 | Display size: | 6 |
| Size: | 3.6" x 6.7" x 0.9" | ||
| Weight: | 4.8 ounces | Serial No: | 525-0052302 |
| Batteries: | 6*AAA | Date of manufacture: | mth 06 year 1975 |
| AC-Adapter: | Origin of manufacture: | USA | |
| Precision: | 6 | Integrated circuits: | Mostek MK6225N |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Hans Bloemen |
The
Corvus 525 - better known as CheckMaster - looks different to electronic
calculators. No doubt, you can't perform even basic calculations with this rare
cuty ! The CheckMaster was introduced in 1975 and keeps track of your check
book. The three dedicated keys
 | CHECK |
| DEPOSIT |
| BALANCE |
simply add to memory, subtract from memory and display the balance of the memory.
When
not in use the CheckMaster folds together to a stylish and slim unit that keeps
the balance in memory even shut off. Due to high power consumption of the memory
the CheckMaster is powered by 6 AAA-size batteries.
Dismantling
the CheckMaster reveals a MK6225N custom programmed single-chip calculator
circuit, a small 7-segment LED display and lot of space for the batteries.
About 7 years later, when the power conserving C-MOS electronics was introduced, a lot of calculators appeared with dedicated check book functions. Don't miss the TI-1880 Checkwriter, TI-2200, Canon Checkbook and some sibblings like the National Semiconductor NS-103 A, the Olivetti Chequebook and the Radio Shack EC-430.
Don't miss "real" calculators of the Corvus brand
like the
310, 320, 400,
415, 500, and 615
models and the desktop line 300E, 305,
and 307.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, March 23, 2003. No reprints without written permission.