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-rw-r--r--src/devices/machine/upd4992.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/devices/machine/upd4992.cpp b/src/devices/machine/upd4992.cpp
index 5d28bb3037c..60a2eece92b 100644
--- a/src/devices/machine/upd4992.cpp
+++ b/src/devices/machine/upd4992.cpp
@@ -38,6 +38,7 @@ upd4992_device::upd4992_device(const machine_config &mconfig, const char *tag, d
, device_rtc_interface(mconfig, *this)
, m_timer_clock(nullptr)
{
+ std::fill(std::begin(m_rtc_regs), std::end(m_rtc_regs), 0);
}