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-rw-r--r--src/mame/drivers/einstein.cpp7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/mame/drivers/einstein.cpp b/src/mame/drivers/einstein.cpp
index 47b1b719576..2d689fd1f63 100644
--- a/src/mame/drivers/einstein.cpp
+++ b/src/mame/drivers/einstein.cpp
@@ -419,8 +419,11 @@ WRITE8_MEMBER(einstein_state::evdpint_msk_w)
READ8_MEMBER( einstein_state::rom_r )
{
- m_rom_enabled ^= 1;
- m_bank1->set_entry(m_rom_enabled);
+ if (!machine().side_effects_disabled())
+ {
+ m_rom_enabled ^= 1;
+ m_bank1->set_entry(m_rom_enabled);
+ }
return 0xff;
}