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-rw-r--r--src/devices/machine/tc009xlvc.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/devices/machine/tc009xlvc.cpp b/src/devices/machine/tc009xlvc.cpp
index b2d302d3922..c4a2db2c18d 100644
--- a/src/devices/machine/tc009xlvc.cpp
+++ b/src/devices/machine/tc009xlvc.cpp
@@ -214,6 +214,9 @@ void tc0090lvc_device::device_post_load()
void tc0090lvc_device::device_start()
{
+ // rom_r assumes it can make a mask with (m_rom.length() - 1)
+ assert(!(m_rom.length() & (m_rom.length() - 1)));
+
m_tile_cb.resolve();
std::fill_n(&m_vram[0], m_vram.bytes(), 0);