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DOS 4.5 Volume and File Disk Management System Second Edition

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This publication describes the products that Walland Philip Vrbancic, Jr., created for his beloved Apple ][ computer. He is an Electrical Engineer, an Aerospace Senior Systems Engineer, and a Professional Programmer since 1983. After he retired in 2011, he designed and programmed an enhanced Disk Operating System for his Apple ][+ and Apple //e computers in order to manage his hundreds of Volumes and Files. Mr. Vrbancic has included source code samples, schematic diagrams, equations, figures, tables, and representative screen shots in order to help explain what he has created and the reasons why he did so. As in his previous Apple ][ DOS publications, this has been another incredible journey for him. With DOS 4.5 in particular, he has again re-imagined that time when he mostly lived, breathed, and worked on Apple ][ hardware and software development continuously for a good period of his life many, many years ago. The list that follows are some of the ingenious and powerful features that Mr. Vrbancic has engineered into his Second Edition of the DOS 4.5 Volume and File Disk Management System. DOS 4.5 Build 06 boots directly into Language Card memory and sets HIMEM to 0xBE00. All five file buffers in DOS 4.5.06 are always available to programs and they are fully contained in Language Card memory. Mr. Vrbancic has completed the full integration of the Lisa and the Big Mac assemblers into Auxiliary Memory and they both utilize and are supported by DOS 4.5.06 resources. Also, he has added additional program logic to both assemblers so that now they both support the complete 65C02 instruction set. He has also fully integrated both Sourceror and Big Mac and now they both support all SWEET16 opcodes. His newest C0:FF Apple //e ROM image is totally compatible with DOS 4.5.06 and this ROM image now fully supports the 65C02 processor, SWEET16, and his phenomenal GARBAGE routine which is based on Bongers' specification. His full IOSPACE ROM image also includes his new HLIN routine which draws perfect HIRES line graphics for his celebrated ICON Maker tool that can be paired with his HIRES CHAR Editor and LENGTH tools in order to create stunning graphic presentations like those that are utilized in his Binary File Installation or BFI software program tool and for all of its on-screen menus and its final installation report. His ROM image only supports the READ command in order to process c2t high frequency audio files that utilize the cassette input port.

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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."