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-rw-r--r--src/mame/alesis/midiverb.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/alesis/midiverb.cpp b/src/mame/alesis/midiverb.cpp
index 163640de243..8ee74402316 100644
--- a/src/mame/alesis/midiverb.cpp
+++ b/src/mame/alesis/midiverb.cpp
@@ -541,7 +541,7 @@ void midiverb_state::midiverb(machine_config &config)
{
I80C31(config, m_maincpu, 6_MHz_XTAL); // U55.
m_maincpu->set_addrmap(AS_PROGRAM, &midiverb_state::program_map);
- m_maincpu->set_addrmap(AS_IO, &midiverb_state::external_memory_map);
+ m_maincpu->set_addrmap(AS_DATA, &midiverb_state::external_memory_map);
m_maincpu->port_out_cb<1>().set(FUNC(midiverb_state::digit_select_w)).mask(0x03); // P1.0-P1.1
m_maincpu->port_out_cb<1>().append(m_dsp, FUNC(midiverb_dsp_device::program_select_w)).rshift(2); // P1.2-P1.7