C H A P T E R 6

Data Input

and other nonalphabetic keys. The caps key locks on when tapped and stays on until tapped again; even closing a keyboard does not turn off the caps key.

Option

The option key changes the character produced by the next tap on a character key to produce a set of international characters and special symbols. For example, in many Newton fonts, option-4 produces the ¢ symbol, option-r produces ®, and option-g produces ©. Like the Newton shift key, the Newton option key is not pressed concurrently with pressing a character key. The Newton option key locks on when tapped and releases automatically when a character key is tapped. Option can be used together with shift, in combination with a character key, to produce still other symbols. For example, option-shift-? produces the Spanish ¿ character.

Arrow Keys

The left arrow and right arrow keys move the text caret left or right one character at a time. If a user selects some text and then taps an arrow key, the text is deselected and the caret appears at the right or left edge of the selection. This action doesn’t move the selected text.

If a user selects a shape and then taps an arrow key, nothing happens. The selected shape does not move, and the selection does not change.

Arrow keys never duplicate the function of scroll arrows.

The modifier keys—caps, shift, and option—have no effect on the arrow keys.

Type-Ahead and Auto-Repeat

If a user types more quickly than the Newton system can handle, the system queues the extra keystrokes for later processing. This queuing is called type-ahead.There’s a limit to the number of keystrokes that can be queued, but this limit is usually not reached unless the user types while an application is performing a lengthy operation.

6-36Typing

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Apple 2 manual Type-Ahead and Auto-Repeat, Option, Arrow Keys

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.