summaryrefslogtreecommitdiffstatshomepage
path: root/src/lib/formats/pc_dsk.c
blob: 45a076cc91c73d02e5e689f4b8953d03d390db16 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
/*********************************************************************

    formats/pc_dsk.c

    PC disk images

*********************************************************************/

#include <string.h>

#include "formats/pc_dsk.h"
#include "formats/basicdsk.h"

struct pc_disk_sizes
{
	UINT32 image_size;
	int sectors;
	int heads;
};



static const struct pc_disk_sizes disk_sizes[] =
{
	{ 8*1*40*512,  8, 1},   /* 5 1/4 inch double density single sided */
	{ 8*2*40*512,  8, 2},   /* 5 1/4 inch double density */
	{ 9*1*40*512,  9, 1},   /* 5 1/4 inch double density single sided */
	{ 9*2*40*512,  9, 2},   /* 5 1/4 inch double density */
	{10*2*40*512, 10, 2},   /* 5 1/4 inch double density single sided */
	{ 9*2*80*512,  9, 2},   /* 80 tracks 5 1/4 inch drives rare in PCs */
	{ 9*2*80*512,  9, 2},   /* 3 1/2 inch double density */
	{15*2*80*512, 15, 2},   /* 5 1/4 inch high density (or japanese 3 1/2 inch high density) */
	{18*2*80*512, 18, 2},   /* 3 1/2 inch high density */
	{21*2*80*512, 21, 2},   /* 3 1/2 inch high density DMF */
	{36*2*80*512, 36, 2}    /* 3 1/2 inch enhanced density */
};



static floperr_t pc_dsk_compute_geometry(floppy_image_legacy *floppy, struct basicdsk_geometry *geometry)
{
	int i;
	UINT64 size;

	memset(geometry, 0, sizeof(*geometry));
	size = floppy_image_size(floppy);

	for (i = 0; i < ARRAY_LENGTH(disk_sizes); i++)
	{
		if (disk_sizes[i].image_size == size)
		{
			geometry->sectors = disk_sizes[i].sectors;
			geometry->heads = disk_sizes[i].heads;
			geometry->sector_length = 512;
			geometry->first_sector_id = 1;
			geometry->tracks = (int) (size / disk_sizes[i].sectors / disk_sizes[i].heads / geometry->sector_length);
			return FLOPPY_ERROR_SUCCESS;
		}
	}

	if (size >= 0x1a)
	{
		/*
		 * get info from boot sector.
		 * not correct on all disks
		 */
		UINT8 scl, spt, heads;
		floppy_image_read(floppy, &scl, 0x0c, 1);
		floppy_image_read(floppy, &spt, 0x18, 1);
		floppy_image_read(floppy, &heads, 0x1A, 1);

		if (size == ((UINT64) scl) * spt * heads * 0x200)
		{
			geometry->sectors = spt;
			geometry->heads = heads;
			geometry->sector_length = 512;
			geometry->first_sector_id = 1;
			geometry->tracks = scl;
			return FLOPPY_ERROR_SUCCESS;
		}
	}

	return FLOPPY_ERROR_SUCCESS;
}



static FLOPPY_IDENTIFY(pc_dsk_identify)
{
	floperr_t err;
	struct basicdsk_geometry geometry;

	err = pc_dsk_compute_geometry(floppy, &geometry);
	if (err)
		return err;

	*vote = geometry.heads ? 100 : 0;
	return FLOPPY_ERROR_SUCCESS;
}



static FLOPPY_CONSTRUCT(pc_dsk_construct)
{
	floperr_t err;
	struct basicdsk_geometry geometry;

	if (params)
	{
		/* create */
		memset(&geometry, 0, sizeof(geometry));
		geometry.heads = option_resolution_lookup_int(params, PARAM_HEADS);
		geometry.tracks = option_resolution_lookup_int(params, PARAM_TRACKS);
		geometry.sectors = option_resolution_lookup_int(params, PARAM_SECTORS);
		geometry.first_sector_id = 1;
		geometry.sector_length = 512;
	}
	else
	{
		/* open */
		err = pc_dsk_compute_geometry(floppy, &geometry);
		if (err)
			return err;
	}

	return basicdsk_construct(floppy, &geometry);
}



/* ----------------------------------------------------------------------- */

LEGACY_FLOPPY_OPTIONS_START( pc )
	LEGACY_FLOPPY_OPTION( pc_dsk, "dsk,ima,img,ufi,360",        "PC floppy disk image", pc_dsk_identify, pc_dsk_construct, NULL,
		HEADS([1]-2)
		TRACKS(40/[80])
		SECTORS(8/[9]/10/15/18/36))
LEGACY_FLOPPY_OPTIONS_END

pc_format::pc_format() : upd765_format(formats)
{
}

const char *pc_format::name() const
{
	return "pc";
}

const char *pc_format::description() const
{
	return "PC floppy disk image";
}

const char *pc_format::extensions() const
{
	return "dsk,ima,img,ufi,360";
}

const pc_format::format pc_format::formats[] = {
	{   /*  160K 5 1/4 inch double density single sided */
		floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM,
		2000,  8, 40, 1, 512, {}, 1, {}, 80, 50, 22, 80
	},
	{   /*  320K 5 1/4 inch double density */
		floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM,
		2000,  8, 40, 2, 512, {}, 1, {}, 80, 50, 22, 80
	},
	{   /*  180K 5 1/4 inch double density single sided */
		floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM,
		2000,  9, 40, 1, 512, {}, 1, {}, 80, 50, 22, 80
	},
	{   /*  360K 5 1/4 inch double density */
		floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM,
		2000,  9, 40, 2, 512, {}, 1, {}, 80, 50, 22, 80
	},
	{   /*  400K 5 1/4 inch double density - gaps unverified */
		floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM,
		2000, 10, 40, 2, 512, {}, 1, {}, 80, 50, 22, 80
	},
	{   /*  720K 5 1/4 inch quad density - gaps unverified */
		floppy_image::FF_525, floppy_image::DSQD, floppy_image::MFM,
		2000,  9, 80, 2, 512, {}, 1, {}, 80, 50, 22, 80
	},
	{   /* 1200K 5 1/4 inch high density */
		floppy_image::FF_525, floppy_image::DSHD, floppy_image::MFM,
		1200, 15, 80, 2, 512, {}, 1, {}, 80, 50, 22, 84
	},
	{   /*  720K 3 1/2 inch double density */
		floppy_image::FF_35,  floppy_image::DSDD, floppy_image::MFM,
		2000,  9, 80, 2, 512, {}, 1, {}, 80, 50, 22, 80
	},
	{   /* 1200K 3 1/2 inch high density (japanese variant) - gaps unverified */
		floppy_image::FF_35,  floppy_image::DSHD, floppy_image::MFM,
		1000, 15, 80, 2, 512, {}, 1, {}, 80, 50, 22, 84
	},
	{   /* 1440K 3 1/2 inch high density */
		floppy_image::FF_35,  floppy_image::DSHD, floppy_image::MFM,
		1000, 18, 80, 2, 512, {}, 1, {}, 80, 50, 22, 108
	},
	{   /* Microsoft DMF 1680K 3 1/2 inch high density - gaps unverified */
		floppy_image::FF_35,  floppy_image::DSHD, floppy_image::MFM,
		1000, 21, 80, 2, 512, {}, 1, {}, 80, 50, 22, 0xc
	},
	{   /* 2880K 3 1/2 inch extended density - gaps unverified */
		floppy_image::FF_35,  floppy_image::DSED, floppy_image::MFM,
			500, 36, 80, 2, 512, {}, 1, {}, 80, 50, 41, 80
	},
	{}
};

const floppy_format_type FLOPPY_PC_FORMAT = &floppy_image_format_creator<pc_format>;