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Diffstat (limited to '3rdparty/portaudio/cmake/modules')
0 files changed, 0 insertions, 0 deletions
Last-Modified: Sun, 04 May 2025 21:44:53 GMT Expires: Sun, 04 May 2025 21:49:53 GMT
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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
/*********************************************************************
formats/dim_dsk.c
DIM disk images
*********************************************************************/
#include <string.h>
#include <assert.h>
#include "dim_dsk.h"
#include "basicdsk.h"
FLOPPY_IDENTIFY(dim_dsk_identify)
{
uint8_t dim_header[16];
floppy_image_read(floppy, (uint8_t*)dim_header,0xab,16);
if(strncmp((const char*)dim_header,"DIFC HEADER",11) == 0)
*vote = 100;
else
*vote = 0;
return FLOPPY_ERROR_SUCCESS;
}
FLOPPY_CONSTRUCT(dim_dsk_construct)
{
struct basicdsk_geometry geometry;
// DIM disk image header, most of this is guesswork
int tracks = 77;
int heads = 2;
int sectors = 8; // per track
int sectorlen = 1024;
int firstsector = 0x01;
uint8_t format_tmp;
int x;
uint16_t temp;
if(params)
{
// create
return FLOPPY_ERROR_UNSUPPORTED;
}
// Offset + 0 : disk format type (1 byte):
// 0 = 2HD / 2HDA (8 sector/track, 1024 bytes/sector, GAP#3 = 0x74)
// 1 = 2HS (9 sector/track, 1024 bytes/sector, GAP#3 = 0x39)
// 2 = 2HC (15 sector/track, 512 bytes/sector, GAP#3 = 0x54)
// 3 = 2HDE(68) (9 sector/track, 1024 bytes/sector, GAP#3 = 0x39)
// 9 = 2HQ (18 sector/track, 512 bytes/sector, GAP#3 = 0x54)
// 17 = N88-BASIC (26 sector/track, 256 bytes/sector, GAP#3 = 0x33)
// or (26 sector/track, 128 bytes/sector, GAP#3 = 0x1a)
//
floppy_image_read(floppy, &format_tmp,0,1);
switch(format_tmp)
{
case 0x00:
sectors = 8;
sectorlen = 1024;
break;
case 0x01:
case 0x03:
sectors = 9;
sectorlen = 1024;
break;
case 0x02:
sectors = 15;
sectorlen = 512;
break;
case 0x09:
sectors = 18;
sectorlen = 512;
break;
case 0x11:
sectors = 26;
sectorlen = 256;
break;
}
tracks = 0;
for (x=0;x<86;x++)
{
floppy_image_read(floppy,&temp,(x*2)+1,2);
if(temp == 0x0101)
tracks++;
}
// TODO: expand on this basic implementation
LOG_FORMATS("FDD: DIM image loaded - type %i, %i tracks, %i sectors per track, %i bytes per sector\n", format_tmp,tracks, sectors,sectorlen);
memset(&geometry, 0, sizeof(geometry));
geometry.heads = heads;
geometry.first_sector_id = firstsector;
geometry.sector_length = sectorlen;
geometry.tracks = tracks+1;
geometry.sectors = sectors;
geometry.offset = 0x100;
return basicdsk_construct(floppy, &geometry);
}
/*********************************************************************
formats/dim_dsk.c
DIM disk images
*********************************************************************/
#include "dim_dsk.h"
dim_format::dim_format()
{
}
const char *dim_format::name() const
{
return "dim";
}
const char *dim_format::description() const
{
return "DIM disk image";
}
const char *dim_format::extensions() const
{
return "dim";
}
int dim_format::identify(io_generic *io, uint32_t form_factor)
{
uint8_t h[16];
io_generic_read(io, h, 0xab, 16);
if(strncmp((const char *)h, "DIFC HEADER", 11) == 0)
return 100;
return 0;
}
bool dim_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
{
int offset = 0x100;
uint8_t h;
uint8_t track_total = 77;
int cell_count = form_factor == floppy_image::FF_35 ? 200000 : 166666;
io_generic_read(io, &h, 0, 1);
int spt, gap3, bps, size;
switch(h) {
case 0:
default:
spt = 8;
gap3 = 0x74;
size = 3;
break;
case 1:
spt = 9;
gap3 = 0x39;
size = 3;
break;
case 3:
spt = 9;
gap3 = 0x39;
size = 3;
break;
case 2:
spt = 15;
gap3 = 0x54;
size = 2;
break;
case 9:
spt = 18;
gap3 = 0x54;
size = 2;
break;
case 17:
spt = 26;
gap3 = 0x33;
size = 1;
break;
}
bps = 128 << size;
for(int track=0; track < track_total; track++)
for(int head=0; head < 2; head++) {
desc_pc_sector sects[30];
uint8_t sect_data[10000];
int sdatapos = 0;
for(int i=0; i<spt; i++) {
sects[i].track = track;
sects[i].head = head;
if(h == 1) // handle 2HS sector layout
{
if(i == 0 && track == 0)
sects[i].sector = i+1;
else
sects[i].sector = i+10;
}
else
sects[i].sector = i+1;
sects[i].size = size;
sects[i].actual_size = bps;
sects[i].deleted = false;
sects[i].bad_crc = false;
sects[i].data = §_data[sdatapos];
io_generic_read(io, sects[i].data, offset, bps);
offset += bps;
sdatapos += bps;
}
build_pc_track_mfm(track, head, image, cell_count, spt, sects, gap3);
}
return true;
}
bool dim_format::save(io_generic *io, floppy_image *image)
{
return false;
}
bool dim_format::supports_save() const
{
return false;
}
const floppy_format_type FLOPPY_DIM_FORMAT = &floppy_image_format_creator<dim_format>;