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diff --git a/src/lib/formats/os9_dsk.cpp b/src/lib/formats/os9_dsk.cpp
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+// license:BSD-3-Clause
+// copyright-holders:tim lindner
+/*********************************************************************
+
+ formats/os9_dsk.c
+
+ OS-9 disk images
+
+ OS-9 Level 2 Technical Reference, Chapter 5, Random Block File
+ Manager, page 2
+
+ Available: http://www.colorcomputerarchive.com/coco/Documents/Manuals/
+ Operating Systems/OS-9 Level 2 Manual (Tandy).pdf
+
+*********************************************************************/
+
+#include <assert.h>
+#include "emu.h"
+#include "formats/imageutl.h"
+
+#include "formats/os9_dsk.h"
+
+os9_format::os9_format() : wd177x_format(formats)
+{
+}
+
+const char *os9_format::name() const
+{
+ return "os9";
+}
+
+const char *os9_format::description() const
+{
+ return "OS-9 floppy disk image";
+}
+
+const char *os9_format::extensions() const
+{
+ return "dsk,os9";
+}
+
+int os9_format::identify(io_generic *io, uint32_t form_factor)
+{
+ int type = find_size(io, form_factor);
+
+ if (type != -1)
+ return 75;
+ return 0;
+}
+
+int os9_format::find_size(io_generic *io, uint32_t form_factor)
+{
+ uint64_t size = io_generic_size(io);
+
+ uint8_t os9_header[0x20];
+ io_generic_read(io, os9_header, 0, 0x20);
+
+ int os9_total_sectors = pick_integer_be(os9_header, 0x00, 3);
+ int os9_heads = BIT(os9_header[0x10], 0) ? 2 : 1;
+ int os9_sectors = pick_integer_be(os9_header, 0x11, 2);
+
+ if (os9_total_sectors > 0 && os9_heads > 0 && os9_sectors > 0) {
+ int os9_tracks = os9_total_sectors / os9_sectors / os9_heads;
+
+ // now let's see if we have valid info
+ if ((os9_tracks * os9_heads * os9_sectors * 256) == size) {
+ for(int i=0; formats[i].form_factor; i++) {
+ const format &f = formats[i];
+
+ if(form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor)
+ continue;
+
+ if(os9_tracks == f.track_count) {
+ if( os9_heads == f.head_count ) {
+ if(os9_sectors == f.sector_count ) {
+ return i;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return -1;
+}
+
+const os9_format::format os9_format::formats[] = {
+ { // 5"25 160K double density
+ floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM,
+ 2000, 18, 35, 1, 256, {}, -1, {1, 7, 13, 2, 8, 14, 3, 9, 15, 4, 10, 16, 5, 11, 17, 6, 12, 18}, 18, 28, 20
+ },
+ { // 5"25 160K double density
+ floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM,
+ 2000, 18, 35, 2, 256, {}, -1, {1, 7, 13, 2, 8, 14, 3, 9, 15, 4, 10, 16, 5, 11, 17, 6, 12, 18}, 18, 28, 20
+ },
+ { // 5"25 160K double density
+ floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM,
+ 2000, 18, 40, 1, 256, {}, -1, {1, 7, 13, 2, 8, 14, 3, 9, 15, 4, 10, 16, 5, 11, 17, 6, 12, 18}, 18, 28, 20
+ },
+ { // 5"25 160K double density
+ floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM,
+ 2000, 18, 40, 2, 256, {}, -1, {1, 7, 13, 2, 8, 14, 3, 9, 15, 4, 10, 16, 5, 11, 17, 6, 12, 18}, 18, 28, 20
+ },
+ { // 5"25 160K double density
+ floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM,
+ 2000, 18, 80, 1, 256, {}, -1, {1, 7, 13, 2, 8, 14, 3, 9, 15, 4, 10, 16, 5, 11, 17, 6, 12, 18}, 18, 28, 20
+ },
+ { // 5"25 160K double density
+ floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM,
+ 2000, 18, 80, 2, 256, {}, -1, {1, 7, 13, 2, 8, 14, 3, 9, 15, 4, 10, 16, 5, 11, 17, 6, 12, 18}, 18, 28, 20
+ },
+ {}
+};
+
+const floppy_format_type FLOPPY_OS9_FORMAT = &floppy_image_format_creator<os9_format>;