DATAMATH CALCULATOR MUSEUM

Mostek MK6010, MK5011

• Features

Work-in-Progress - NOT RELEASED.

QUICK-LINK to Mostek Calculator Integrated Circuits.

• Calculator Logic Implementation

MK6010, MK5011:

Capacity: Up to 12 digits (positive and negative)
Logic: Algebraic Adding Machine Logic with Automatic Constant
   [2] [x] [3] [+=] [4] [x] [5] [+=] → '20.'
Number Entry: Right-justified number entry, entering a thirteenth digit is resulting in an overflow condition and is only recoverable using the [C] key
   [0 2 3 4]: [1] [2] [3] [4] [5] [6] [7] [8] [9] [0] [1] [2] [3] → '0.0.0.0.0.0.0.0.0.0.0.0.'
Decimal Point: First entered decimal point is used, additional decimal point entries are ignored
   [0 2 3 4]: [1] [.] [2] [.] [3] → '1.23'
Fixed Decimal Point: The decimal point can be set to [0 2 3 4] digits
   [0 2 3 4]: [1] [+=] [2] [+=] → '3.000'
Clear: Automatic power-up clear implemented. [C] key clears the whole calculator, [CE] key clears last entry of a number
   [0 2 3 4]: [1] [+=] [2] [C] [3] [+=] → '3.'; [1] [+=] [2] [CE] [3] [+=] → '4.'
Change Sign: Not supported. When performing multiplication or division, a negative value can only be assigned to the first number by pressing the [−=] key after entering the number
   [0 2 3 4]: [2] [−=] [x] [3] [+=] → '- 6.'; [2] [x] [3] [−=] → '-1.'
Number Display: Right-justified number display with leading-zero suppression
Negative Numbers: Negative numbers are shown with an active signal at a dedicated output pin and usually connected to a discrete LED indicator
Calculating Overflow: An overflow results in displaying all zeros with all decimal points lit and is only recoverable using the [C] key
   [0 2 3 4]: [1] [2] [3] [4] [5] [x] [1] [2] [3] [4] [5] [+=] → '0.0.0.0.0.0.0.0.0.0.0.0.', [C] → '0.0000'
Divide By Zero: A division of a positive or negative number by zero results in an infinity loop with the display blanked and is only recoverable using the [C] key
   [0 2 3 4]: [1] [:] [0] [+=] → '   ', [C] → '0.'
Display Test: Pressing the [C] or [CE] key lit up all 12 digits of the display
   [C] → '888888888888', [CE] → '888888888888'
Rounding: Rounding of displayed calculating results is not supported
   [0 2 3 4]: [2] [0] [:] [3] [+=] → '6.666'

Known Calculator Logic Bugs:

Negative Zero Bug : Certain calculations result in displaying a negative zero
   [0 2 3 4]: [1] [−=] → '-1.', [1] [+=] → '-0.'
Divide to Negative Zero Bug: Certain calculations result in displaying a negative zero
   [0 2 3 4]: [0] [.] [0] [0] [0] [1] [−=] → '-0.0001', [:] [1] [0] [+=] → '-0.0000'
Fix Point Switch Bug: Changing the position of the Fix Point Switch during number entry leads to unexpected results
   [0 2 3 4]: [1] [.] [2] [3] → '1.23', [0 2 3 4]: [+=] → '1230000'
Twelfth Digit Multiplication Bug: Multiplications with the sum of digits for multiplicand and multiplier larger than twelve result in an overflow
   [0 2 3 4]: [1] [2] [3] [4] [5] [6] [7] [8] [9] [0] [1] [2] [x] → '123456789012.', [1] [+=] → '0.0.0.0.0.0.0.0.0.0.0.0.'
   [0 2 3 4]: [6] [5] [4] [3] [2] [1] [x] → '654321.', [6] [5] [4] [3] [2] [1] [+=] → '428135971041.'
Twelfth Digit Division Bug: Divisions with the dividend or the divisor larger than eleven digits result in an overflow
   [0 2 3 4]: [1] [2] [3] [4] [5] [6] [7] [8] [9] [0] [1] [2] [:] → '123456789012.', [1] [+=] → '0.0.0.0.0.0.0.0.0.0.0.0.'
   [0 2 3 4]: [1] [:] → '1.', [1] [2] [3] [4] [5] [6] [7] [8] [9] [0] [1] [2] [+=] → '0.0.0.0.0.0.0.0.0.0.0.0.'

If you have additions to the above datasheet please email: joerg@datamath.org.