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| Chapter | Topic | Why Searchers Want It | | :--- | :--- | :--- | | 3 | 8086 System Bus & Timing | Clarifies READY and WAIT states. | | 7 | Interrupt Controller (8259A) | Best explanation for cascading in AT clones. | | 9 | DMA Controller (8237) | Essential for floppy/hard disk controllers. | | 12 | Video Adapters (MDA, CGA, EGA, VGA) | The missing link between BIOS and display. | | 14 | BIOS & Clone Compatibility | Phoenix BIOS reverse-engineering story inside. | ibm pc and clones by govindarajulu pdf upd
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