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Diffstat (limited to 'src/lib/formats/os9_dsk.cpp')
-rw-r--r-- | src/lib/formats/os9_dsk.cpp | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/lib/formats/os9_dsk.cpp b/src/lib/formats/os9_dsk.cpp new file mode 100644 index 00000000000..8cd2bd985bf --- /dev/null +++ b/src/lib/formats/os9_dsk.cpp @@ -0,0 +1,115 @@ +// 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>; |