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-rw-r--r--src/emu/emumem_hedr.ipp4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/emu/emumem_hedr.ipp b/src/emu/emumem_hedr.ipp
index 4cd0dfa8bf5..6841ea8d607 100644
--- a/src/emu/emumem_hedr.ipp
+++ b/src/emu/emumem_hedr.ipp
@@ -336,8 +336,8 @@ template<int HighBits, int Width, int AddrShift> void handler_entry_read_dispatc
template<int HighBits, int Width, int AddrShift> void handler_entry_read_dispatch<HighBits, Width, AddrShift>::populate_mismatched_nomirror(offs_t start, offs_t end, offs_t ostart, offs_t oend, const memory_units_descriptor<Width, AddrShift> &descriptor, u8 rkey, std::vector<mapping> &mappings)
{
- offs_t start_entry = start >> LowBits;
- offs_t end_entry = end >> LowBits;
+ offs_t start_entry = (start & HIGHMASK) >> LowBits;
+ offs_t end_entry = (end & HIGHMASK) >> LowBits;
range_cut_before(ostart-1, start_entry);
range_cut_after(oend+1, end_entry);