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- timing example: sequencer control while changing the READ/WRITE or SHIFT/LOAD switches
- timing example: switcing to write after checking write protect
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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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