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-rw-r--r--src/emu/memory.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/emu/memory.c b/src/emu/memory.c
index c7440daa24b..b4c49dd3fd5 100644
--- a/src/emu/memory.c
+++ b/src/emu/memory.c
@@ -3435,7 +3435,8 @@ UINT16 *address_table::subtable_open(offs_t l1index)
for (int i=0; i<size; i++)
subptr[i] = subentry;
m_table[l1index] = newentry;
- m_subtable[newentry - SUBTABLE_BASE].m_checksum = (subentry + (subentry << 8) + (subentry << 16) + (subentry << 24)) * ((1 << level2_bits())/4);
+ UINT32 subkey = subentry + (subentry << 8) + (subentry << 16) + (subentry << 24);
+ m_subtable[newentry - SUBTABLE_BASE].m_checksum = subkey * (((1 << level2_bits())/4));
subentry = newentry;
}