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- Table 2 -- Main Status Register
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- bit 0 Drive 0 busy seeking
- bit 1 Drive 1 busy seeking
- bit 2 Drive 2 busy seeking
- bit 3 Drive 3 busy seeking
- bit 4 FDC Busy doing a command (other than seek)
- bit 5 Non-DMA mode
- bit 6 DIO: Data Input/Output (1 = input)
- bit 7 RQM: Request for Master (1 = ready for transfer)