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DOS 4.3 File Management System

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This publication describes the process and products I created when I decided to design and program an enhanced Disk Operating System (DOS) for my Apple //e. Wherever I am able, I have included code samples, schematic diagrams, equations, figures, tables, and representative screen shots to help explain what I have created and the reasons why I did so. As in my previous design of an Apple ][ DOS, i.e. DOS 4.1L and DOS 4.1H that I released in 2018, this has been an incredible journey for me. With DOS 4.3, I have again re-imagined that time when I mostly lived, breathed, and worked on Apple ][ hardware and software development continuously for a good period of my life many, many years ago. The list that follows are some of the features that I have engineered into the DOS 4.3 File Management System. DOS 4.3 boots directly into Language Card memory and sets HIMEM to 0xBE00. All five file buffers are fully contained in Language Card memory. DOS 4.3 supports the full integration of the Lisa and Big Mac assemblers in Auxiliary Memory. Both assemblers now support the full 65C02 instruction set. Sourceror and Big Mac both support all SWEET16 opcodes. My ROM image supports the 65C02, SWEET16, and GARBAGE based on Bongers' algorithm. DOS 4.3 supports most Clock Cards which play an integral role in Volume and File timestamps. Volumes may be titled, numbered, locked, and initialized to boot or to store data exclusively. Even track 0x00 is used for data. Files are loaded and saved using an acceleration algorithm. DOS 4.3 supports Applesoft CHAIN, File DIFF, File GREP, File LIST, File Undelete, Sector Display, Sector Modify, Syntactical HELP, DOS Processing Control, Variable Management, Half-Phase Tracking, and full lowercase command and argument input. DOS 4.3 copies files using a modified FID that accepts Volume and Phase Number parameters. DOS 4.3 can read DOS 3. Volumes and files. DOS 4.3 can initialize Volumes with up to 48 tracks having either 16 or 32 sectors per track. All the source code and all the schematics can be requested through www.applecored.net.

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The utilities, tools, schematic diagrams, Excel files, and Edraw files that Mr. Vrbancic created and utilized for his knowledge-based resources in the development of DOS 4.5.06 and for this publication can all be obtained through www.applecored.net as TAR files. Walland Philip Vrbancic, Jr., received his BS degree in Zoology in 1970 from the University of California, Los Angeles. In 1973 he obtained a post-graduate degree as an Orthopedic Physician's Assistant from the University of Southern California Medical Center. While he worked as an OPA for over nine years, he studied Electrical Engineering at California State University in Long Beach. In 1980 he was graduated with a BS degree in Electrical Engineering from that University. He joined the Space Shuttle Simulation Laboratory at Rockwell International in Downey, California, in November, 1980, which was about five months prior to the launch of STS-1. It was at this time he became fascinated with the Apple ][ computer. While Mr. Vrbancic worked at Raytheon beginning in 1985, he began designing, developing, and programming very, very High Speed Data Transcription Engines and its Real Time software for tactical radar and sensor systems that were hosted on SGI high-end graphic computers. The most significant and celebrated software project that Mr. Vrbancic designed, developed, and programmed for Raytheon was a Digital Playback System. As Mr. Vrbancic observes "I have always viewed software development as a set of very complex strategies that involve highly developed problem solving techniques. To develop such programming skills requires passion, perseverance, and practice. One cannot be expected to perform a Fiorillo Caprice overnight without expending a little passion, a little perseverance, and a little practice. Learning how to utilize and manage the memory of the Language Card partition in the Apple ][ computer is, in itself, very complicated, problematic, and certainly not intuitive. When that memory is managed correctly, the utilization of the Language Card partition provides great opportunities to expand one's programming skills. But those skills are still considerably simple compared to the skills that are required to utilize and manage Auxiliary memory. Only with passion, perseverance, and practice will the Apple ][ hardware reveal itself and yield its total computational power to that competent software and hardware engineer."