mirror of
https://github.com/holub/mame
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102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*********************************************************************
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formats/dim_dsk.c
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DIM disk images
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*********************************************************************/
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#include <string.h>
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#include "dim_dsk.h"
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#include "basicdsk.h"
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FLOPPY_IDENTIFY(dim_dsk_identify)
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{
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UINT8 dim_header[16];
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floppy_image_read(floppy, (UINT8*)dim_header,0xab,16);
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if(strncmp((const char*)dim_header,"DIFC HEADER",11) == 0)
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*vote = 100;
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else
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*vote = 0;
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return FLOPPY_ERROR_SUCCESS;
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}
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FLOPPY_CONSTRUCT(dim_dsk_construct)
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{
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struct basicdsk_geometry geometry;
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// DIM disk image header, most of this is guesswork
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int tracks = 77;
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int heads = 2;
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int sectors = 8; // per track
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int sectorlen = 1024;
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int firstsector = 0x01;
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UINT8 format_tmp;
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int x;
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UINT16 temp;
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if(params)
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{
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// create
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return FLOPPY_ERROR_UNSUPPORTED;
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}
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// Offset + 0 : disk format type (1 byte):
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// 0 = 2HD / 2HDA (8 sector/track, 1024 bytes/sector, GAP#3 = 0x74)
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// 1 = 2HS (9 sector/track, 1024 bytes/sector, GAP#3 = 0x39)
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// 2 = 2HC (15 sector/track, 512 bytes/sector, GAP#3 = 0x54)
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// 3 = 2HDE(68) (9 sector/track, 1024 bytes/sector, GAP#3 = 0x39)
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// 9 = 2HQ (18 sector/track, 512 bytes/sector, GAP#3 = 0x54)
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// 17 = N88-BASIC (26 sector/track, 256 bytes/sector, GAP#3 = 0x33)
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// or (26 sector/track, 128 bytes/sector, GAP#3 = 0x1a)
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//
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floppy_image_read(floppy, &format_tmp,0,1);
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switch(format_tmp)
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{
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case 0x00:
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sectors = 8;
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sectorlen = 1024;
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break;
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case 0x01:
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case 0x03:
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sectors = 9;
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sectorlen = 1024;
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break;
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case 0x02:
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sectors = 15;
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sectorlen = 512;
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break;
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case 0x09:
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sectors = 18;
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sectorlen = 512;
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break;
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case 0x11:
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sectors = 26;
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sectorlen = 256;
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break;
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}
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tracks = 0;
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for (x=0;x<86;x++)
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{
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floppy_image_read(floppy,&temp,(x*2)+1,2);
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if(temp == 0x0101)
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tracks++;
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}
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// TODO: expand on this basic implementation
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LOG_FORMATS("FDD: DIM image loaded - type %i, %i tracks, %i sectors per track, %i bytes per sector\n", format_tmp,tracks, sectors,sectorlen);
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memset(&geometry, 0, sizeof(geometry));
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geometry.heads = heads;
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geometry.first_sector_id = firstsector;
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geometry.sector_length = sectorlen;
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geometry.tracks = tracks+1;
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geometry.sectors = sectors;
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geometry.offset = 0x100;
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return basicdsk_construct(floppy, &geometry);
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}
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