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author Vas Crabb <vas@vastheman.com>2019-03-26 11:13:37 +1100
committer Vas Crabb <vas@vastheman.com>2019-03-26 11:13:37 +1100
commit97b67170277437131adf6ed4d60139c172529e4f (patch)
tree7a5cbf608f191075f1612b1af15832c206a3fe2d /src/lib/formats/hpi_dsk.cpp
parentb380514764cf857469bae61c11143a19f79a74c5 (diff)
(nw) Clean up the mess on master
This effectively reverts b380514764cf857469bae61c11143a19f79a74c5 and c24473ddff715ecec2e258a6eb38960cf8c8e98e, restoring the state at 598cd5227223c3b04ca31f0dbc1981256d9ea3ff. Before pushing, please check that what you're about to push is sane. Check your local commit log and ensure there isn't anything out-of-place before pushing to mainline. When things like this happen, it wastes everyone's time. I really don't need this in a week when real work™ is busting my balls and I'm behind where I want to be with preparing for MAME release.
Diffstat (limited to 'src/lib/formats/hpi_dsk.cpp')
-rw-r--r--src/lib/formats/hpi_dsk.cpp96
1 files changed, 78 insertions, 18 deletions
diff --git a/src/lib/formats/hpi_dsk.cpp b/src/lib/formats/hpi_dsk.cpp
index 8d23f151862..50d2653280d 100644
--- a/src/lib/formats/hpi_dsk.cpp
+++ b/src/lib/formats/hpi_dsk.cpp
@@ -4,9 +4,10 @@
hpi_dsk.cpp
- HP9895A "HPI" disk images
+ HP9885/HP9895A "HPI" disk images
- CHS = 77/2/30
+ CHS = 67/1/30 (SSDD)
+ CHS = 77/2/30 (DSDD)
Sector size 256 bytes
Cell size 2 µs
Gap1 = 16 x 0x00
@@ -40,7 +41,7 @@
256 bytes per sector). There's also a "reduced" version holding
just 75 cylinders.
When loading, the disk image is translated to MMFM encoding so
- that it can be loaded into HP9895 emulator.
+ that it can be loaded into HP9885/HP9895 emulator.
*********************************************************************/
@@ -65,11 +66,14 @@ constexpr int ID_DATA_OFFSET = 30 * 16; // Nominal distance (in cells) between I
// Size of image file (holding 77 cylinders)
constexpr unsigned HPI_IMAGE_SIZE = HPI_TRACKS * HPI_HEADS * HPI_SECTORS * HPI_SECTOR_SIZE;
constexpr unsigned HPI_RED_TRACKS = 75; // Reduced number of tracks
+constexpr unsigned HPI_9885_TRACKS = 67; // Tracks visible to HP9885 drives
// Size of reduced image file (holding 75 cylinders)
constexpr unsigned HPI_RED_IMAGE_SIZE = HPI_RED_TRACKS * HPI_HEADS * HPI_SECTORS * HPI_SECTOR_SIZE;
hpi_format::hpi_format()
{
+ (void)HPI_IMAGE_SIZE;
+ (void)HPI_RED_IMAGE_SIZE;
}
int hpi_format::identify(io_generic *io, uint32_t form_factor)
@@ -79,27 +83,79 @@ int hpi_format::identify(io_generic *io, uint32_t form_factor)
// we try to stay back and give only 50 points, since another image
// format may also have images of the same size (there is no header and no
// magic number for HPI format...
+ unsigned dummy_heads;
+ unsigned dummy_tracks;
if (((form_factor == floppy_image::FF_8) || (form_factor == floppy_image::FF_UNKNOWN)) &&
- ((size == HPI_RED_IMAGE_SIZE) || (size == HPI_IMAGE_SIZE))) {
+ geometry_from_size(size , dummy_heads , dummy_tracks)) {
return 50;
} else {
return 0;
}
}
+bool hpi_format::geometry_from_size(uint64_t image_size , unsigned& heads , unsigned& tracks)
+{
+ if ((image_size % HPI_SECTOR_SIZE) != 0) {
+ // Not a whole number of sectors
+ return false;
+ }
+ unsigned sectors = unsigned(image_size / HPI_SECTOR_SIZE);
+ if ((sectors % HPI_SECTORS) != 0) {
+ // Not a whole number of tracks
+ return false;
+ }
+ unsigned tot_tracks = sectors / HPI_SECTORS;
+ // Possible combinations
+ //
+ // | Tot tracks | Heads | Tracks | Format |
+ // |------------+-------+--------+--------|
+ // | 67 | 1 | 67 | SSDD |
+ // | 77 | 1 | 77 | SSDD |
+ // | 150 | 2 | 75 | DSDD |
+ // | 154 | 2 | 77 | DSDD |
+ //
+ switch (tot_tracks) {
+ case HPI_9885_TRACKS:
+ heads = 1;
+ tracks = HPI_9885_TRACKS;
+ return true;
+
+ case HPI_TRACKS:
+ heads = 1;
+ tracks = HPI_TRACKS;
+ return true;
+
+ case HPI_RED_TRACKS * 2:
+ heads = 2;
+ tracks = HPI_RED_TRACKS;
+ return true;
+
+ case HPI_TRACKS * 2:
+ heads = 2;
+ tracks = HPI_TRACKS;
+ return true;
+
+ default:
+ return false;
+ }
+}
+
bool hpi_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
{
- image->set_variant(floppy_image::DSDD); // We actually need to derive the variant from the image size depending on the form factor
+ unsigned heads;
+ unsigned cylinders;
uint64_t size = io_generic_size(io);
- unsigned cylinders;
- if (size == HPI_RED_IMAGE_SIZE) {
- cylinders = HPI_RED_TRACKS;
- } else if (size == HPI_IMAGE_SIZE) {
- cylinders = HPI_TRACKS;
- } else {
+ if (!geometry_from_size(size, heads, cylinders)) {
+ return false;
+ }
+ int max_tracks;
+ int max_heads;
+ image->get_maximal_geometry(max_tracks , max_heads);
+ if (cylinders > max_tracks || heads > max_heads) {
return false;
}
+ image->set_variant(heads == 2 ? floppy_image::DSDD : floppy_image::SSDD);
// Suck in the whole image
std::vector<uint8_t> image_data(size);
@@ -118,11 +174,11 @@ bool hpi_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
unsigned list_offset = 0;
for (unsigned cyl = 0; cyl < cylinders; cyl++) {
- for (unsigned head = 0; head < HPI_HEADS; head++) {
+ for (unsigned head = 0; head < heads; head++) {
std::vector<uint32_t> track_data;
for (unsigned sector = 0; sector < HPI_SECTORS; sector++) {
unsigned real_sector = sector_list[ (sector + list_offset) % HPI_SECTORS ];
- unsigned offset_in_image = chs_to_lba(cyl, head, real_sector) * HPI_SECTOR_SIZE;
+ unsigned offset_in_image = chs_to_lba(cyl, head, real_sector, heads) * HPI_SECTOR_SIZE;
write_sector(track_data , cyl , real_sector + (head << 7) , &image_data[ offset_in_image ]);
}
fill_with_gap3(track_data);
@@ -135,8 +191,12 @@ bool hpi_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
bool hpi_format::save(io_generic *io, floppy_image *image)
{
- for (unsigned cyl = 0; cyl < HPI_TRACKS; cyl++) {
- for (unsigned head = 0; head < HPI_HEADS; head++) {
+ int tracks;
+ int heads;
+ image->get_actual_geometry(tracks, heads);
+
+ for (int cyl = 0; cyl < tracks; cyl++) {
+ for (int head = 0; head < heads; head++) {
uint8_t bitstream[ 21000 ];
int bitstream_size;
generate_bitstream_from_track(cyl , head , CELL_SIZE , bitstream , bitstream_size , image , 0);
@@ -145,7 +205,7 @@ bool hpi_format::save(io_generic *io, floppy_image *image)
uint8_t sector_data[ HPI_SECTOR_SIZE ];
while (get_next_sector(bitstream , bitstream_size , pos , track_no , head_no , sector_no , sector_data)) {
if (track_no == cyl && head_no == head && sector_no < HPI_SECTORS) {
- unsigned offset_in_image = chs_to_lba(cyl, head, sector_no) * HPI_SECTOR_SIZE;
+ unsigned offset_in_image = chs_to_lba(cyl, head, sector_no, heads) * HPI_SECTOR_SIZE;
io_generic_write(io, sector_data, offset_in_image, HPI_SECTOR_SIZE);
}
}
@@ -300,9 +360,9 @@ void hpi_format::fill_with_gap3(std::vector<uint32_t> &buffer)
}
}
-unsigned hpi_format::chs_to_lba(unsigned cylinder , unsigned head , unsigned sector)
+unsigned hpi_format::chs_to_lba(unsigned cylinder , unsigned head , unsigned sector , unsigned heads)
{
- return sector + (head + cylinder * HPI_HEADS) * HPI_SECTORS;
+ return sector + (head + cylinder * heads) * HPI_SECTORS;
}
std::vector<uint8_t> hpi_format::get_next_id_n_block(const uint8_t *bitstream , int bitstream_size , int& pos , int& start_pos)