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(mess) floppy: Fix write over the index pulse and flux change lookup before it [O. Galibert]

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Olivier Galibert 2014-02-26 07:46:55 +00:00
parent 3c4b75fd97
commit b1854f93da
1 changed files with 6 additions and 3 deletions
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9
src/emu/imagedev/floppy.c
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@ -557,16 +557,18 @@ int floppy_image_device::find_index(UINT32 position, const UINT32 *buf, int buf_
UINT32 floppy_image_device::find_position(attotime &base, attotime when) UINT32 floppy_image_device::find_position(attotime &base, attotime when)
{ {
base = revolution_start_time; base = revolution_start_time;
UINT32 revc = revolution_count;
attotime delta = when - base; attotime delta = when - base;
while(delta >= rev_time) { while(delta >= rev_time) {
delta -= rev_time; delta -= rev_time;
base += rev_time; base += rev_time;
revc++; }
while(delta < attotime::zero) {
delta += rev_time;
base -= rev_time;
} }
return (delta*rpm/300.).as_ticks(1000000000); return (delta*rpm/300.0).as_ticks(1000000000);
} }
attotime floppy_image_device::get_next_transition(attotime from_when) attotime floppy_image_device::get_next_transition(attotime from_when)
@ -647,6 +649,7 @@ void floppy_image_device::write_flux(attotime start, attotime end, int transitio
write_zone(buf, cells, index, pos, next_pos, cur_mg); write_zone(buf, cells, index, pos, next_pos, cur_mg);
else { else {
write_zone(buf, cells, index, pos, 200000000, cur_mg); write_zone(buf, cells, index, pos, 200000000, cur_mg);
index = 0;
write_zone(buf, cells, index, 0, next_pos, cur_mg); write_zone(buf, cells, index, 0, next_pos, cur_mg);
} }
pos = next_pos; pos = next_pos;