values you may become satisfied that your

 

program is functioning correctly. You

 

should then type in CONT to Continue

 

executing your program where it left off, or

 

type a direct GOTO statement to resume

 

execution of the program at a different line.

 

You could also use assignment statements

 

to set some of your variables to different

 

values. Remember, if you interrupt a

 

program with the F1 key and expect to

 

continue it later, you must not get any

 

errors or type in any new program lines.

 

If you do, you won't be able to continue

 

and will get a "CN" (continue not) error.

 

It is impossible to continue a direct

 

command. CONT always resumes

 

execution at the next statement to be

 

executed in your program when F1 was

 

typed.

STATEMENT

SYNTAX/FUNCTION

FRE

FRE (expression)

 

Gives the number of memory bytes

 

currently unused by BASIC. A dummy

 

operand--0 or 1--must be used.

STATEMENT

SYNTAX/FUNCTION

LIST

LIST [[start line] [-[end line]]]

 

Lists current program optionally starting at

 

specified line. List can be interrupted with

 

the F1 key. (BASIC will finish listing the

 

current line.)

 

Lists entire program

 

Lists just line 100.

 

Lists lines 100 to 1000.

 

Lists from current line to line 1000.

 

Lists from line 100 to end of program.

STATEMENT

SYNTAX/FUNCTION

LOAD

LOAD

 

Loads a BASIC program from the cassette

 

tape. When done, the LOAD will display

 

the cursor. See Appendix G for more

 

information.

STATEMENT

SYNTAX/FUNCTION

NEW

NEW

 

Deletes current program and all variables.

STATEMENT

SYNTAX/FUNCTION

PEEK

PEEK (address)

 

The PEEK function returns the contents of

 

memory address I in decimal. The value

 

returned will be =>0 and <=255. If I is

 

>65535 or <0, an FC error will occur.

 

An attempt to read a non-existent memory

 

address will return an unknown value.

STATEMENT

SYNTAX/FUNCTION

EXAMPLE

270 PRINT FRE(0)

EXAMPLE

LIST

LIST 100

LIST 100-1000 LIST -1000 LIST 100-

EXAMPLE

LOAD

EXAMPLE

NEW

EXAMPLE

356 PRINT PEEK(I)

EXAMPLE

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Apple II manual Statement SYNTAX/FUNCTION FRE, Statement SYNTAX/FUNCTION List, Statement SYNTAX/FUNCTION Load, Example List
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II specifications

The Apple II, launched in April 1977, was one of the first highly successful mass-produced microcomputer products. It marked a significant leap in personal computing, setting standards for future developments in the industry. Created by Steve Wozniak and Steve Jobs, the Apple II differentiated itself with its user-friendly design, appealing aesthetics, and robust capabilities.

One of the standout features of the Apple II was its open architecture, which allowed users to expand and enhance the computer's functionality. This design enabled hundreds of third-party hardware and software developers to contribute to its ecosystem, resulting in an array of peripherals, including printers, modems, and storage devices. The Apple II utilized a MOS Technology 6502 microprocessor running at a clock speed of 1 MHz. Initially equipped with 4 KB of RAM, the machine could be expanded to 48 KB, accommodating more complex applications and programs.

The Apple II was also notable for its colorful graphics. It was one of the first computers to support color display, offering a 6-color palette with a resolution of 280x192 pixels in 16 colors when using its Color Graphics Card. This feature significantly enhanced the visual appeal of games and educational software developed for the platform, making computing more accessible and entertaining for various audiences.

Apple's commitment to user experience was evident in the design of the machine. It featured an integrated keyboard and a plastic case, which was both durable and visually appealing. The self-contained design included drive bays for floppy disk drives, allowing for quicker data access than traditional tape drives. It also supported audio output, enabling sound effects and music, a novelty at the time.

The introduction of the Apple DOS operating system further underscored the machine's capabilities. DOS streamlined file management and made it easier for users to navigate and manage their data. The combination of hardware and software positioned the Apple II as an educational tool and a gaming platform, fostering a vibrant software ecosystem.

The Apple II family continued to evolve, with variations like the Apple II+, IIe, and IIgs being introduced over the years. These iterations brought enhancements in memory, processing power, and graphics capabilities. The legacy of the Apple II endures, not only as a foundational product in personal computing but also as a symbol of innovation that paved the way for future advancements in technology. Its impact is still felt today, as it inspired countless developers and shaped the trajectory of the computer industry.
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