mirror of
https://github.com/holub/mame
synced 2025-05-22 05:38:52 +03:00
ddb290d5f6
Use standard uint64_t, uint32_t, uint16_t or uint8_t instead of UINT64, UINT32, UINT16 or UINT8 also use standard int64_t, int32_t, int16_t or int8_t instead of INT64, INT32, INT16 or INT8
85 lines
1.9 KiB
C++
85 lines
1.9 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Olivier Galibert
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/*********************************************************************
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formats/m20_dsk.c
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Olivetti M20 floppy-disk images
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Track 0/head 0 is FM, 128 byte sectors. The rest is MFM,
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256 byte sectors.
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In image files the sectors of track 0/sector 0 are 256 bytes
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long to simplify access. Only the first half of these sectors
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contain image data.
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*********************************************************************/
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#include "m20_dsk.h"
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m20_format::m20_format()
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{
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}
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const char *m20_format::name() const
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{
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return "m20";
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}
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const char *m20_format::description() const
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{
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return "M20 disk image";
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}
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const char *m20_format::extensions() const
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{
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return "img";
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}
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bool m20_format::supports_save() const
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{
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return false;
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}
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int m20_format::identify(io_generic *io, uint32_t form_factor)
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{
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if(io_generic_size(io) == 286720)
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return 50;
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return 0;
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}
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bool m20_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
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{
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for(int track = 0; track < 35; track++)
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for(int head = 0; head < 2; head ++) {
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bool mfm = track || head;
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desc_pc_sector sects[16];
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uint8_t sectdata[16*256];
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io_generic_read(io, sectdata, 16*256*(track*2+head), 16*256);
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for(int i=0; i<16; i++) {
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int j = i/2 + (i & 1 ? 0 : 8);
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sects[i].track = track;
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sects[i].head = head;
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sects[i].sector = j+1;
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sects[i].size = mfm ? 1 : 0;
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sects[i].actual_size = mfm ? 256 : 128;
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sects[i].data = sectdata + 256*j;
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sects[i].deleted = false;
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sects[i].bad_crc = false;
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}
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if(mfm)
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build_wd_track_mfm(track, head, image, 100000, 16, sects, 50, 32, 22);
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else
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build_wd_track_fm(track, head, image, 50000, 16, sects, 24, 16, 11);
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}
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return true;
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}
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bool m20_format::save(io_generic *io, floppy_image *image)
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{
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return false;
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}
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const floppy_format_type FLOPPY_M20_FORMAT = &floppy_image_format_creator<m20_format>;
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