Apple II Original ROM Information

Source

http://members.buckeye-express.com/marksm/6502/

27 June 2004

The 6502 Firmware Page

This site is mostly about the firmware -- software in ROM -- that came with the original Apple II, not the II+, IIe, IIc, or IIgs. The original Apple II had 4K of RAM and 8K of ROM. The ROM contains software, such as the Monitor and Integer BASIC, appropriate for a SBC.

Red Book refers to the original Apple II Reference Manual dated 1978.

WOZPAK refers to the WOZPAK II, a publication by Call-A.P.P.L.E., an Apple II user group.

DDJ refers to Dr. Dobbs Journal, a computer magazine.

IA refers to Interface Age, a publication of the SCCS (Southern California Computer Society).

SYM and AIM refer to early 6502 single board computers.

Contents

*Apple II ROM (12 KB binary)

*Memory map of the Apple II ROMs

*Summary of Monitor Commands

*Red Book Monitor listing

*Red Book Sweet-16 listing

*WOZPAK Sweet-16 article by Steve Wozniak

*WOZPAK Sweet-16 article by Dick Sedgewick

*Red Book Mini-Assembler listing

*Red Book Floating point listing

*WOZPAK Floating point routines description

*DDJ Floating point article

*IA Floating point article

*SYM Monitor listing

*AIM Monitor listing

*AIM BASIC Language Reference Manual

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Questions or comments? Email me at paulrsm@buckeye-express.com

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Updates

*2000-09-01 -- Added AIM BASIC Language Reference Manual

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Apple manual Apple II Original ROM Information

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.