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-rw-r--r--src/mame/drivers/capbowl.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mame/drivers/capbowl.cpp b/src/mame/drivers/capbowl.cpp
index fec21ecd991..5628573257c 100644
--- a/src/mame/drivers/capbowl.cpp
+++ b/src/mame/drivers/capbowl.cpp
@@ -323,7 +323,9 @@ MACHINE_CONFIG_START(capbowl_state::capbowl)
MCFG_DEVICE_PROGRAM_MAP(capbowl_map)
MCFG_DEVICE_VBLANK_INT_DRIVER("screen", capbowl_state, interrupt)
- WATCHDOG_TIMER(config, m_watchdog).set_time(PERIOD_OF_555_ASTABLE(100000.0, 100000.0, 0.1e-6) * 15.5); // ~0.3s
+ // watchdog: 555 timer 16 cycles, edge triggered, ~0.3s
+ attotime period = PERIOD_OF_555_ASTABLE(100000.0, 100000.0, 0.1e-6);
+ WATCHDOG_TIMER(config, m_watchdog).set_time(period * 16 - period / 2);
MCFG_DEVICE_ADD("audiocpu", MC6809E, MASTER_CLOCK / 4) // MC68B09EP
MCFG_DEVICE_PROGRAM_MAP(sound_map)