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1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * %sccs.include.redist.c% | |
6 | * | |
7 | * @(#)fdreg.h 7.1 (Berkeley) %G% | |
8 | */ | |
9 | ||
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10 | /* |
11 | * AT floppy controller registers and bitfields | |
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12 | */ |
13 | ||
14 | /* uses NEC765 controller */ | |
15 | #include "../i386/isa/ic/nec765.h" | |
16 | ||
17 | /* registers */ | |
18 | #define fdout 2 /* Digital Output Register (W) */ | |
19 | #define FDO_FDSEL 0x01 /* floppy device select */ | |
20 | #define FDO_FRST 0x04 /* floppy controller reset */ | |
21 | #define FDO_FDMAEN 0x08 /* enable floppy DMA and Interrupt */ | |
22 | #define FDO_MOEN0 0x10 /* motor enable drive 0 */ | |
23 | #define FDO_MOEN1 0x20 /* motor enable drive 1 */ | |
24 | ||
25 | #define fdsts 4 /* NEC 765 Main Status Register (R) */ | |
26 | #define fddata 5 /* NEC 765 Data Register (R/W) */ | |
27 | ||
28 | #define fdctl 7 /* Control Register (W) */ | |
29 | #define FDC_500KBPS 0x00 /* 500KBPS MFM drive transfer rate */ | |
30 | #define FDC_300KBPS 0x01 /* 300KBPS MFM drive transfer rate */ | |
31 | #define FDC_250KBPS 0x02 /* 250KBPS MFM drive transfer rate */ | |
32 | #define FDC_125KBPS 0x03 /* 125KBPS FM drive transfer rate */ | |
33 | ||
34 | #define fdin 7 /* Digital Input Register (R) */ | |
35 | #define FDI_DCHG 0x80 /* diskette has been changed */ | |
36 | ||
37 |