curta
Simulator for the Curta Type I, a mechanical calculator manufactured between 1947 and 1972.
Install
npm install --save curta
Usage
To compute the multiplication of 27 × 4:
var Curta = ;var curta = ; // Load 27 in the Setting Registercurta;curta; // Turn the handle 4 timescurta; curta; // => 108curta; // => 4
Just as we would on a normal Curta.
More advanced, 1024 × 512:
var curta = ; curta;curta;curta; curta;curta; curta;curta; curta;curta; curta; // => 524288curta; // => 512
API
var curta = new Curta()
Creates a zeroed-out Curta state.
curta.turn([n])
Turns the crank once, or if a number is passed in, that number of times.
curta.liftCrank()
Lifts the crank, so that each turn will subtract from the counter and result instead of adding to them.
curta.lowerCrank()
Lowers the crank, putting the calculator back in addition mode.
curta.clearCounting()
Clears the counting registers.
curta.clearResult()
Clears the result registers.
curta.clear()
Clears both the counting and result registers.
curta.readCarriage()
Reads the carriage setting, which determines the exponent of 10 we add to the counter.
curta.setCarriage(position)
Sets the carriage position to a value between 1 and 6.
curta.readSetting([register])
Reads the value of the setting registers. If a given register
is passed in (a number between 1 and 11), it reads the value of
that particular register.
curta.readCounter([register])
Reads the value of the counting registers.
curta.readResult([register])
Reads the value of the result registers.
curta.setRegister(register, value)
Sets the given setting register to a particular value.
Testing
npm install
npm test
License
MIT © Jordan Scales