Apple II

Apple II. The Apple II is an 8-bit personal computer designed primarily by Steve Wozniak and marketed by Apple Computer. Launched in June 1977, it was one of the first highly successful mass-produced microcomputers, renowned for its color graphics, open architecture, and expansive software library. Its accessibility and versatility helped propel the microcomputer revolution, establishing Apple Computer as a major player in the nascent personal computer industry.

History

The development of the computer was led by Steve Wozniak, who integrated his earlier work on the Apple I with major advancements in design. With funding and marketing vision from Steve Jobs, the machine was unveiled at the West Coast Computer Faire in 1977. Its immediate popularity was bolstered by the 1979 release of VisiCalc, the first spreadsheet program for personal computers, which created a compelling business use case. Throughout the early 1980s, it faced increasing competition from the IBM Personal Computer and the Commodore 64, but remained a staple in schools and homes for over a decade. Production of various models continued until 1993, with the final variant being the Apple IIe Card for the Macintosh LC.

Hardware

At its core was the MOS Technology 6502 microprocessor, typically running at 1.023 MHz. The original model featured 4 kilobytes of RAM, expandable to 48 KB on the motherboard. A defining characteristic was its open architecture, with seven active expansion slots on the motherboard that allowed users to add functionality from third-party vendors. Output was via NTSC composite video, supporting both text and, innovatively for the time, color graphics. Mass storage initially relied on audio cassette tapes before the 1978 introduction of the Disk II floppy drive, a low-cost design also created by Wozniak. Other notable hardware included a built-in BASIC programming language in ROM and a simple 1-bit speaker for sound generation.

Software

The computer's software ecosystem was vast and influential. It initially used Integer BASIC in ROM, with later systems using the more comprehensive AppleSoft BASIC. The primary operating system for disk-based operations was Apple DOS, later succeeded by the more advanced ProDOS. The 1979 release of VisiCalc by Software Arts was a landmark, transforming the machine into a serious business tool. A rich library of educational software, such as The Oregon Trail by the Minnesota Educational Computing Consortium, made it dominant in schools. It also hosted early computer games like Mystery House from Sierra On-Line and became a popular platform for programming in UCSD Pascal and CP/M via expansion cards.

Models and variants

The original Apple II was followed by the Apple II Plus in 1979, which included more memory and AppleSoft BASIC. The Apple IIe, released in 1983, became the most popular and long-lived model, featuring a redesigned keyboard, more expansion capabilities, and support for both uppercase and lowercase characters. The portable Apple IIc, introduced in 1984, was a compact, all-in-one unit designed as a closed system. The final major model was the 16-bit Apple IIGS (1986), which featured a greatly enhanced Ensoniq sound chip, a Graphical User Interface, and the Western Design Center 65C816 processor. Specialized variants included the Apple II Plus-based Bell & Howell model for education and the Apple IIe Card expansion card.

Legacy and impact

The computer is widely credited with defining the early personal computer industry and demonstrating the viability of the home computer market. Its open architecture fostered a huge third-party hardware and software market, a model later abandoned by Apple Computer with the Macintosh. Its deep penetration into American schools influenced an entire generation, familiarizing students with computing. The success of the platform provided the financial and technological foundation for the development of the Macintosh and ensured the survival of Apple Computer through difficult periods. It is remembered as a quintessential product of the Silicon Valley garage startup ethos and is a celebrated icon in the history of computing.

Category:Apple II computers Category:Home computers Category:Products introduced in 1977