C H A P T E R 6

Data Input

Tapping

People can quickly and accurately input data that an application presents in a multiple-choice format such as a picker, scrolling list, set of checkboxes, cluster of radio buttons, or slider. A user simply taps or drags to choose an input value from the options presented.

Pickers

Pickers allow a user to enter information in a way that is fast, fun, and intuitive. They have the added advantages of being easy to target and taking up minimal real estate. The Newton system defines many types of pickers: list pickers, overview pickers, location pickers, date pickers, time pickers, and number pickers. In most of these pickers, a user can input data with a couple of taps.

A picker simplifies data input by listing all the possible values, or at least several common values, for an input field. A field’s picker is not visible until a user taps the field’s label, which begins with a diamond. Then the picker pops up, and the user can pick a listed input by tapping it in the picker. If the user taps one of the picker items, the picked item becomes the field value and the application displays it next to the field label. If the user does not tap any of the picker items, there is no change to the selected input displayed next to the picker. Figure 6-2 demonstrates how a picker works for data input.

A picker may always list the same set of inputs, or it may list different input items each time it pops up. The application can modify a picker in response to user input or to changes in the application’s environment.

Tapping

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Apple 2 manual Tapping, Pickers

2 specifications

The Apple II is a defining product in the history of personal computing, first introduced in 1977 by Apple Computer, Inc. Designed by Steve Wozniak, the Apple II was one of the first highly successful mass-produced microcomputer products and played a significant role in bringing personal computers into homes and schools.

One of the Apple II's standout features was its color graphics capability. It was one of the first personal computers to provide color output, thanks to its built-in video interface. The initial model supported a resolution of 280x192 pixels with a palette of 6 colors, which allowed for vibrant visuals that set it apart from contemporaries like the monochrome Altair 8800.

The Apple II was notable for its open architecture. This design allowed users to expand the computer's capabilities easily through a series of expansion slots. Users could add floppy disk drives, additional memory, and various peripheral devices, making the system highly adaptable to individual needs. This encouraged a thriving ecosystem of third-party hardware and software, which contributed to its popularity.

Another significant feature was its use of the 6502 microprocessor. This 8-bit CPU was not only affordable but also powerful for its time, allowing the Apple II to run various applications efficiently. Along with a built-in keyboard and an innovative plastic case that housed its components, the design was user-friendly and appealing.

The Apple II also introduced the concept of “bootable software” through the use of floppy disks. The disk operating system (DOS) allowed users to store and run multiple programs without having to reload software manually, providing a level of convenience that had not been widely available before. Key software like VisiCalc, the first spreadsheet program, helped boost sales, showcasing the Apple II's utility in business and education environments.

The computer was also well-known for its early adoption of BASIC programming language. Apple provided an operating system that supported Applesoft BASIC, which enabled users, including students, to write their programs, further fostering a community of developers.

In summary, the Apple II's color graphics, open architecture, powerful 6502 processor, innovative use of floppy disks, and support for BASIC programming made it a revolutionary product in its time. Its legacy laid the groundwork for future personal computers and established Apple as a leader in the burgeoning tech industry. The Apple II remains an iconic symbol of the early personal computing era, reflecting a generation's transition into a digitally connected world.