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-rw-r--r--src/lib/formats/flex_dsk.cpp107
1 files changed, 107 insertions, 0 deletions
diff --git a/src/lib/formats/flex_dsk.cpp b/src/lib/formats/flex_dsk.cpp
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index 00000000000..ced4bf2f8a5
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+++ b/src/lib/formats/flex_dsk.cpp
@@ -0,0 +1,107 @@
+// license:BSD-3-Clause
+// copyright-holders:Barry Rodewald
+/*
+ * flex_dsk.c - FLEX compatible disk images
+ *
+ * Created on: 24/06/2014
+ */
+
+ #include "emu.h" // logerror
+#include "flex_dsk.h"
+
+flex_format::flex_format()
+{
+}
+
+const char *flex_format::name() const
+{
+ return "flex";
+}
+
+const char *flex_format::description() const
+{
+ return "FLEX compatible disk image";
+}
+
+const char *flex_format::extensions() const
+{
+ return "dsk";
+}
+
+bool flex_format::supports_save() const
+{
+ return true;
+}
+
+int flex_format::identify(io_generic *io, UINT32 form_factor)
+{
+ io_generic_read(io, &info, 256 * 2, sizeof(struct sysinfo_sector));
+
+ if(((info.last_trk+1) * info.last_sec) * 256 == io_generic_size(io))
+ {
+ osd_printf_verbose("flex_dsk: %i tracks, %i sectors\n",info.last_trk+1,info.last_sec);
+ return 100;
+ }
+ return 0;
+}
+
+bool flex_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
+{
+ int spt = info.last_sec;
+ int bps = 256;
+ int cell_count = (form_factor == floppy_image::FF_525) ? 50000 : 100000;
+ int offset = 0;
+ int head_num = 1;
+ int total_tracks = info.last_trk+1;
+ bool double_sided = false;
+
+ if(total_tracks == 40 && spt == 36)
+ double_sided = true;
+ if(total_tracks == 77 && spt == 30)
+ double_sided = true;
+ if(total_tracks == 80 && spt == 40) // 800kB
+ double_sided = true;
+ if(total_tracks == 80 && spt == 72) // 1.44MB
+ double_sided = true;
+ if(spt >= 20)
+ double_sided = true;
+
+ if(double_sided)
+ {
+ spt = spt / 2;
+ head_num = 2;
+ }
+
+ for(int track=0; track < total_tracks; track++)
+ for(int head=0;head < head_num;head++)
+ {
+ desc_pc_sector sects[80];
+ UINT8 sect_data[20000];
+ int sdatapos = 0;
+ for(int i=0; i<spt; i++)
+ {
+ sects[i].track = track;
+ sects[i].head = head; // no side select?
+ if(head == 0)
+ sects[i].sector = i+1;
+ else
+ sects[i].sector = i+1+spt;
+ sects[i].actual_size = bps;
+ sects[i].size = 1;
+ sects[i].deleted = false;
+ sects[i].bad_crc = false;
+ sects[i].data = &sect_data[sdatapos];
+ io_generic_read(io, sects[i].data, offset, bps);
+ offset += bps;
+ sdatapos += bps;
+ }
+ // gap sizes unverified
+ if(total_tracks == 35 && spt == 18 && (track >= 1 && track <= 2)) // handle Gimix Flex 3.6 disk image, which the boot sector loads tracks 1 and 2 as MFM
+ build_wd_track_mfm(track, head, image, cell_count*2, spt, sects, 50, 32, 22);
+ else
+ build_wd_track_fm(track, head, image, cell_count, spt, sects, 24, 16, 11);
+ }
+ return true;
+}
+
+const floppy_format_type FLOPPY_FLEX_FORMAT = &floppy_image_format_creator<flex_format>;