Corvus 406

Date of introduction:  1975 Display technology:  LED-stick
New price:   Display size:  8
Size:  5.0" x 3.0" x 0.9"    
Weight:  3.7 ounces Serial No:  406-0108960
Batteries:  9V Date of manufacture:  mth 02 year 1975
AC-Adapter:  A-3310 Origin of manufacture:  USA
Precision:  8 Integrated circuits:  Mostek MK50282A
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Corvus_406_PCB.jpg (78141 Byte)The Corvus 400 changed during production time it's calculator brain and the power supply. This Corvus 406 uses a 9V battery instead the four unusual  N-batteries found in the earlier model 400.

Within a short period of only some month Corvus manufactured 5 different versions of the original Model 400. This gives an idea of both cost pressure and material shortage mid of the 70's.

Serial Number Supply Calculator Brain Date 
400-110233 4*N MK50280A wk 21 year 74 1 IC LED modules
400-016025 4*N MK50280A wk 51 year 74 1 IC LED-stick
400-110291 4*N MK50282A wk 06 year 75 2 IC LED modules
2310-0122872 4*A MK50282N wk 08 year 75 discrete LED-stick
406-0108960 9V MK50282A wk 07 year 75 discrete LED modules

Learn more about Mostek Calculator Integrated Circuits.

Don't miss the colorful Corvus 804.

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If you have additions to the above article please email:

Joerg Woerner, November 19, 2002. No reprints without written permission.