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:|| 3.8" x 2.1" x 0.13"
94 x 172 x 25 mm3
|Weight:||1.4 ounces, 151 grams||Serial No:||525-0081597|
|Batteries:||6*AAA cells||Date of manufacture:||mth 06 year 1975|
|AC-Adapter:||Origin of manufacture:||USA|
|Precision:||6||Integrated circuits:||Mostek MK6225N|
|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
simply add to memory, subtract from memory and display the balance of the memory.
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. Learn more about Mostek Calculator Integrated Circuits.
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
310, 320, 400,
415, 500, and 615
models and the desktop line 300E, 305,
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, March 23, 2003. No reprints without written permission.