DATAMATH CALCULATOR MUSEUM |
Corvus 305
Date of introduction: | 1973 | Display technology: | Panaplex II |
New price: | Display size: | 10 | |
Size: | 8.5" x 6.5" x 2.2" | ||
Weight: | 1 pound 9 ounces | Serial No: | 305-103660 |
Batteries: | Date of manufacture: | mth 08 year 1973 | |
AC-Adapter: | 115 V | Origin of manufacture: | USA |
Precision: | 10 | Integrated circuits: | Mostek MK6092P (7335) MK5017 |
Memories: | |||
Program steps: | Courtesy of: | Joerg Woerner |
Corvus, the consumer division of the famous IC manufacturer MOSTEK, introduced with the Model 300E their first desktop four-function calculator. This unique Model 305 added a clock with calendar function, we know a similar approach from the Texas Instruments TI-3510 and the Garrett 2002.
Dismantling
the calculator reveals a small surprise. The printed circuit board (PCB) is
identical with the Corvus 300E and an additional clock module is located piggy
back on the main board. CAL-Position
Normal calculator function known from the 300E.
Learn more about Mostek Calculator Integrated
Circuits.
The
back side of the calculator gives immediately an explanation of the two mystery
holes and the small slit noticed already in the PCB of the Corvus 300E. They
occupy the push buttons to adjust the clock and calendar plus a selector switch.
A small switch located near the [=] key selects between the calculator and clock
mode:
CLK-Position
Reads the time in hours, minutes and seconds.
Every
10 seconds Reads the date in month and day for 3 seconds.
Three different desktop calculators were available from Corvus: •
Model 300E: Unusual desktop
calculator with square-root function |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, March 23, 2003. No reprints without written permission.