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-rw-r--r--src/mame/machine/6883sam.cpp6
1 files changed, 3 insertions, 3 deletions
diff --git a/src/mame/machine/6883sam.cpp b/src/mame/machine/6883sam.cpp
index 3f455fc3954..6c525eaea72 100644
--- a/src/mame/machine/6883sam.cpp
+++ b/src/mame/machine/6883sam.cpp
@@ -270,9 +270,9 @@ void sam6883_device::update_memory(void)
{
// full 64k RAM
m_space_0000.point(m_banks[0], 0x0000, m_banks[0].m_memory_size);
- m_space_8000.point(m_banks[0], 0x8000);
- m_space_A000.point(m_banks[0], 0xA000);
- m_space_C000.point(m_banks[0], 0xC000);
+ m_space_8000.point(m_banks[0], 0x8000 & (m_banks[0].m_memory_size - 1));
+ m_space_A000.point(m_banks[0], 0xA000 & (m_banks[0].m_memory_size - 1));
+ m_space_C000.point(m_banks[0], 0xC000 & (m_banks[0].m_memory_size - 1));
m_counter_mask = 0xFFFF;
setup_rom = false;
}