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MAME 0.230
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| // license:BSD-3-Clause | ||
| // copyright-holders:Nathan Woods | ||
| /********************************************************************* | ||
| formats/pc_dsk_legacy.cpp | ||
| PC disk images (legacy support for imgtool) | ||
| *********************************************************************/ | ||
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| #include "formats/pc_dsk_legacy.h" | ||
| #include "formats/basicdsk.h" | ||
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| struct pc_disk_sizes | ||
| { | ||
| uint32_t image_size; | ||
| int sectors; | ||
| int heads; | ||
| }; | ||
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| 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 */ | ||
| }; | ||
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| static floperr_t pc_dsk_compute_geometry(floppy_image_legacy *floppy, struct basicdsk_geometry *geometry) | ||
| { | ||
| int i; | ||
| uint64_t size; | ||
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| memset(geometry, 0, sizeof(*geometry)); | ||
| size = floppy_image_size(floppy); | ||
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| for (i = 0; i < std::size(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; | ||
| } | ||
| } | ||
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| if (size >= 0x1a) | ||
| { | ||
| /* | ||
| * get info from boot sector. | ||
| * not correct on all disks | ||
| */ | ||
| uint8_t scl, spt, heads; | ||
| floppy_image_read(floppy, &scl, 0x0c, 1); | ||
| floppy_image_read(floppy, &spt, 0x18, 1); | ||
| floppy_image_read(floppy, &heads, 0x1A, 1); | ||
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| if (size == ((uint64_t) 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; | ||
| } | ||
| } | ||
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| return FLOPPY_ERROR_SUCCESS; | ||
| } | ||
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| static FLOPPY_IDENTIFY(pc_dsk_identify) | ||
| { | ||
| floperr_t err; | ||
| struct basicdsk_geometry geometry; | ||
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| err = pc_dsk_compute_geometry(floppy, &geometry); | ||
| if (err) | ||
| return err; | ||
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| *vote = geometry.heads ? 100 : 0; | ||
| return FLOPPY_ERROR_SUCCESS; | ||
| } | ||
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| static FLOPPY_CONSTRUCT(pc_dsk_construct) | ||
| { | ||
| floperr_t err; | ||
| struct basicdsk_geometry geometry; | ||
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| if (params) | ||
| { | ||
| /* create */ | ||
| memset(&geometry, 0, sizeof(geometry)); | ||
| geometry.heads = params->lookup_int(PARAM_HEADS); | ||
| geometry.tracks = params->lookup_int(PARAM_TRACKS); | ||
| geometry.sectors = params->lookup_int(PARAM_SECTORS); | ||
| geometry.first_sector_id = 1; | ||
| geometry.sector_length = 512; | ||
| } | ||
| else | ||
| { | ||
| /* open */ | ||
| err = pc_dsk_compute_geometry(floppy, &geometry); | ||
| if (err) | ||
| return err; | ||
| } | ||
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| return basicdsk_construct(floppy, &geometry); | ||
| } | ||
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| /* ----------------------------------------------------------------------- */ | ||
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| 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, nullptr, | ||
| HEADS([1]-2) | ||
| TRACKS(40/[80]) | ||
| SECTORS(8/[9]/10/15/18/36)) | ||
| LEGACY_FLOPPY_OPTIONS_END |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| // license:BSD-3-Clause | ||
| // copyright-holders:Nathan Woods | ||
| /********************************************************************* | ||
| formats/pc_dsk_legacy.h | ||
| PC disk images (legacy support for imgtool) | ||
| *********************************************************************/ | ||
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| #ifndef PC_DSK_LEGACY_H | ||
| #define PC_DSK_LEGACY_H | ||
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| #include "formats/flopimg.h" | ||
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| /**************************************************************************/ | ||
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| LEGACY_FLOPPY_OPTIONS_EXTERN(pc); | ||
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| #endif /* PC_DSK_LEGACY_H */ |
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