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-
- Table 1 - Digital-Output Register (DOR)
- ---------------------------------------
- bits 0 & 1 a two bit field for drive select
- bit 2 NOT reset: if clear, card is held reset
- bit 3 permit Interrupt 6 and DMA requests from card
- bit 4 floppy drive 0 ('A') motor on
- bit 5 floppy drive 1 ('B') motor on
- bit 6 floppy drive 2 motor on (not usually used in PC)
- bit 7 floppy drive 3 motor on (not usually used in PC)
-
- Note: to reset card, output a zero to the DOR, then output 0x0C (bits two
- and three set). This will set and release the "reset" signal and allow
- interrupts and DMA, but not select a drive or turn a motor on.
-
- Note: to select a drive, the drive number is in binary should be placed
- in bits 0 & 1. e.g., drive 1 would be bit 0 set and bit 1 clear.