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-rw-r--r--src/lib/formats/pc_dsk.cpp214
1 files changed, 214 insertions, 0 deletions
diff --git a/src/lib/formats/pc_dsk.cpp b/src/lib/formats/pc_dsk.cpp
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index 00000000000..19e0f21e08e
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+++ b/src/lib/formats/pc_dsk.cpp
@@ -0,0 +1,214 @@
+// license:BSD-3-Clause
+// copyright-holders:Nathan Woods
+/*********************************************************************
+
+ formats/pc_dsk.c
+
+ PC disk images
+
+*********************************************************************/
+
+#include <string.h>
+#include <assert.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>;