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floppy: When the floppy head stays on an unformatted track from more than an hour and ten minutes and reading happens then interval_index*2+1 overflows. Wow. Found and tracked down by Colin Howell, with much thanks.

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Olivier Galibert 2021-01-25 09:50:20 +01:00 committed by Vas Crabb
parent 722f0a9739
commit 0c5e9a0560
1 changed files with 1 additions and 1 deletions
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src/devices/imagedev/floppy.cpp
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@ -932,7 +932,7 @@ attotime floppy_image_device::get_next_transition(const attotime &from_when)
return cache_end_time; return cache_end_time;
// Put a flux transition in the middle of a 4us interval with a 50% probability // Put a flux transition in the middle of a 4us interval with a 50% probability
int interval_index = (from_when - cache_weak_start).as_ticks(250000); int64_t interval_index = (from_when - cache_weak_start).as_ticks(250000);
if(interval_index < 0) if(interval_index < 0)
interval_index = 0; interval_index = 0;
attotime weak_time = cache_weak_start + attotime::from_ticks(interval_index*2+1, 500000); attotime weak_time = cache_weak_start + attotime::from_ticks(interval_index*2+1, 500000);