dc46480aa4
Added experimental NVidia Riva TNT2 emulation (patch from MoochMcGee); ASUS P/I-P54TP4XE, ASUS P/I-P55T2P4, and ASUS P/I-P55TVP4 are back; National Semiconductor PC87306 Super I/O chip now correctly reenables devices after a chip power cycle; Several FDC improvements and the behavior is now a bit closer to real hardware (based on actual tests); Added MR Intel Advanced/ATX with Microid Research BIOS with support for 4 floppy drives and up to 4 IDE controllers; Added floppy drives 3 and 4, bringing the maximum to 4; You can now connect hard disks to the tertiary IDE controller; Correct undocumented behavior of the LEA instruction with register is back on 286 and later CPU's; Pentium-rea models with Intel chipsets now have port 92 (with alternate reset and alternate A20 toggle); Overhauled DMA channel read and write routines and fixed cascading; Improved IMG detection of a bad BPB (or complete lack of a BPB); Added preliminary emulation of PS/2 1.44 MB and PC-98 1.25 MB 3-mode drives (both have an inverted DENSEL pin); Removed the incorrect Amstrad mouse patch from TheCollector1995; Fixed ATAPI CD-ROM disk change detection; Windows IOCTL CD-ROM handler now tries to use direct SCSI passthrough for more things, including obtaining CD-ROM capacity; The Diamond Stealth32 (ET4000/W32p) now also works correctly on the two Award SiS 496/497 boxes; The (S)VGA handler now converts 6-bit RAMDAC RGB channels to standard 8-bit RGB using a lookup table generated at emulator start, calculated using the correct intensity conversion method and treating intensity 64 as equivalent to 63; Moved a few options from the Configuration dialog box to the menu; SIO, PIIX, and PIIX3 now have the reset control register on port CF9 as they should; Several bugfixes.
277 lines
5.9 KiB
C
277 lines
5.9 KiB
C
/* Copyright holders: Sarah Walker, Tenshi
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see COPYING for more details
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*/
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#include "ibm.h"
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#include "disc.h"
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#include "fdc.h"
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#include "fdd.h"
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static struct
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{
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int type;
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int track;
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int densel;
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int head;
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} fdd[FDD_NUM];
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/* Flags:
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Bit 0: 300 rpm supported;
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Bit 1: 360 rpm supported;
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Bit 2: size (0 = 3.5", 1 = 5.25");
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Bit 3: double density supported;
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Bit 4: high density supported;
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Bit 5: extended density supported;
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Bit 6: double step for 40-track media;
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Bit 7: invert DENSEL polarity;
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Bit 8: ignore DENSEL;
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Bit 9: drive is a PS/2 drive;
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*/
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#define FLAG_RPM_300 1
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#define FLAG_RPM_360 2
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#define FLAG_525 4
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#define FLAG_HOLE0 8
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#define FLAG_HOLE1 16
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#define FLAG_HOLE2 32
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#define FLAG_DOUBLE_STEP 64
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#define FLAG_INVERT_DENSEL 128
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#define FLAG_IGNORE_DENSEL 256
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#define FLAG_PS2 512
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static struct
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{
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int max_track;
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int flags;
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} drive_types[] =
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{
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{ /*None*/
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.max_track = 0,
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.flags = 0
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},
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{ /*5.25" DD*/
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.max_track = 43,
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.flags = FLAG_RPM_300 | FLAG_525 | FLAG_HOLE0
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},
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{ /*5.25" HD*/
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.max_track = 86,
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.flags = FLAG_RPM_360 | FLAG_525 | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP
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},
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{ /*5.25" HD Dual RPM*/
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.max_track = 86,
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.flags = FLAG_RPM_300 | FLAG_RPM_360 | FLAG_525 | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP
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},
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{ /*3.5" DD*/
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.max_track = 86,
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.flags = FLAG_RPM_300 | FLAG_HOLE0 | FLAG_DOUBLE_STEP
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},
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{ /*3.5" HD PS/2*/
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.max_track = 86,
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.flags = FLAG_RPM_300 | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP | FLAG_INVERT_DENSEL | FLAG_PS2
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},
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{ /*3.5" HD*/
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.max_track = 86,
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.flags = FLAG_RPM_300 | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP
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},
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{ /*3.5" HD PC-98*/
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.max_track = 86,
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.flags = FLAG_RPM_300 | FLAG_RPM_360 | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP | FLAG_INVERT_DENSEL
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},
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{ /*3.5" HD 3-Mode*/
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.max_track = 86,
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.flags = FLAG_RPM_300 | FLAG_RPM_360 | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP
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},
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{ /*3.5" ED*/
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.max_track = 86,
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.flags = FLAG_RPM_300 | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_HOLE2 | FLAG_DOUBLE_STEP
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}
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};
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int fdd_swap = 0;
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void fdd_forced_seek(int drive, int track_diff)
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{
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drive = real_drive(drive);
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fdd[drive].track += track_diff;
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// pclog("Seeking %i tracks...\n", track_diff);
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if (fdd[drive].track < 0)
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fdd[drive].track = 0;
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if (fdd[drive].track > drive_types[fdd[drive].type].max_track)
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fdd[drive].track = drive_types[fdd[drive].type].max_track;
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disc_seek(drive, fdd[drive].track);
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disctime = 5000;
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}
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void fdd_seek(int drive, int track_diff)
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{
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drive = real_drive(drive);
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if (!track_diff)
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{
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disctime = 5000;
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return;
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}
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fdd[drive].track += track_diff;
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// pclog("Seeking %i tracks...\n", track_diff);
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if (fdd[drive].track < 0)
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fdd[drive].track = 0;
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if (fdd[drive].track > drive_types[fdd[drive].type].max_track)
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fdd[drive].track = drive_types[fdd[drive].type].max_track;
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fdc_discchange_clear(drive);
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disc_seek(drive, fdd[drive].track);
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disctime = 5000;
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}
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int fdd_track0(int drive)
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{
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drive = real_drive(drive);
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/* If drive is disabled, TRK0 never gets set. */
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if (!drive_types[fdd[drive].type].max_track) return 0;
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return !fdd[drive].track;
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}
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void fdd_set_densel(int densel)
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{
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int i = 0;
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for (i = 0; i < 4; i++)
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{
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if (drive_types[fdd[i].type].flags & FLAG_INVERT_DENSEL)
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{
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fdd[i].densel = densel ^ 1;
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}
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else
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{
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fdd[i].densel = densel;
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}
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}
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}
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int fdd_getrpm(int drive)
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{
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int hole = disc_hole(drive);
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int densel = 0;
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drive = real_drive(drive);
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densel = fdd[drive].densel;
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if (drive_types[fdd[drive].type].flags & FLAG_INVERT_DENSEL)
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{
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densel ^= 1;
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}
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if (!(drive_types[fdd[drive].type].flags & FLAG_RPM_360)) return 300;
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if (!(drive_types[fdd[drive].type].flags & FLAG_RPM_300)) return 360;
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if (drive_types[fdd[drive].type].flags & FLAG_525)
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{
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return densel ? 360 : 300;
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}
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else
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{
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/* disc_hole(drive) returns 0 for double density media, 1 for high density, and 2 for extended density. */
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if (hole == 1)
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{
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return densel ? 300 : 360;
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}
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else
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{
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return 300;
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}
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}
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}
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void fdd_setswap(int swap)
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{
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fdd_swap = swap ? 1 : 0;
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}
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int fdd_can_read_medium(int drive)
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{
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int hole = disc_hole(drive);
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drive = real_drive(drive);
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hole = 1 << (hole + 3);
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// pclog("Drive %02X, type %02X, hole flag %02X, flags %02X, result %02X\n", drive, fdd[drive].type, hole, drive_types[fdd[drive].type].flags, drive_types[fdd[drive].type].flags & hole);
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return (drive_types[fdd[drive].type].flags & hole) ? 1 : 0;
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}
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int fdd_doublestep_40(int drive)
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{
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return (drive_types[fdd[drive].type].flags & FLAG_DOUBLE_STEP) ? 1 : 0;
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}
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void fdd_set_type(int drive, int type)
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{
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int old_type = fdd[drive].type;
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fdd[drive].type = type;
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if ((drive_types[old_type].flags ^ drive_types[type].flags) & FLAG_INVERT_DENSEL)
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{
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fdd[drive].densel ^= 1;
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}
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}
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int fdd_get_type(int drive)
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{
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return fdd[drive].type;
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}
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int fdd_get_flags(int drive)
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{
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return drive_types[fdd[drive].type].flags;
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}
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int fdd_is_525(int drive)
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{
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return drive_types[fdd[drive].type].flags & FLAG_525;
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}
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int fdd_is_ed(int drive)
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{
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return drive_types[fdd[drive].type].flags & FLAG_HOLE2;
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}
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void fdd_set_head(int drive, int head)
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{
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drive = real_drive(drive);
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fdd[drive].head = head;
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}
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int fdd_get_head(int drive)
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{
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return fdd[drive].head;
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}
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int fdd_get_densel(int drive)
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{
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if (drive_types[fdd[drive].type].flags & FLAG_INVERT_DENSEL)
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{
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return fdd[drive].densel ^ 1;
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}
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else
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{
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return fdd[drive].densel;
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}
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}
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void fdd_init()
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{
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}
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