https://github.com/jdan/curta
Simulator for a Curta Type I mechanical calculator
https://github.com/jdan/curta
Last synced: about 1 year ago
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Simulator for a Curta Type I mechanical calculator
- Host: GitHub
- URL: https://github.com/jdan/curta
- Owner: jdan
- License: mit
- Created: 2014-12-08T01:47:53.000Z (over 11 years ago)
- Default Branch: master
- Last Pushed: 2014-12-09T01:10:00.000Z (over 11 years ago)
- Last Synced: 2025-03-29T05:12:21.495Z (about 1 year ago)
- Language: JavaScript
- Size: 137 KB
- Stars: 5
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# curta [](https://travis-ci.org/jdan/curta)
Simulator for the [Curta Type I](http://en.wikipedia.org/wiki/Curta),
a mechanical calculator manufactured between 1947 and 1972.
## Install
```sh
npm install --save curta
```
## Usage
To compute the multiplication of **27 × 4**:
```js
var Curta = require("curta");
var curta = new Curta();
// Load 27 in the Setting Register
curta.setRegister(1, 7);
curta.setRegister(2, 2);
// Turn the handle 4 times
curta.turn(4);
curta.result(); // => 108
curta.readCounter(); // => 4
```
Just as we would on a normal Curta.
More advanced, **1024 × 512**:
```js
var curta = new Curta();
curta.setRegister(4, 1);
curta.setRegister(2, 2);
curta.setRegister(1, 4);
curta.setCarriage(3);
curta.turn(5);
curta.setCarriage(2);
curta.turn();
curta.setCarriage(1);
curta.turn(2);
curta.result(); // => 524288
curta.readCounter(); // => 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](http://jordanscales.com)