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- 128-byte video memory segments consist of three 40-byte sections, each mapped into a different part of the video screen
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Understanding the Apple II (by Jim Sather) is a incomparable source of information about how the Apple II works. It documents all motherboard circuits, describes the disk controller operation, explains RAM and ROM and includes 23 hardware and software Application Notes, including shift key mod, disk write protect mod, and EPROM mods
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