diff --git a/src/mame/drivers/mac.cpp b/src/mame/drivers/mac.cpp
index 2189d54b52b..90474a077eb 100644
--- a/src/mame/drivers/mac.cpp
+++ b/src/mame/drivers/mac.cpp
@@ -1208,7 +1208,7 @@ void mac_state::maciici(machine_config &config)
 
 void mac_state::maciisi(machine_config &config)
 {
-	macii(config, false, asc_device::asc_type::ASC, false);
+	macii(config, false, asc_device::asc_type::ASC, false, true, true, 1);
 
 	M68030(config, m_maincpu, 20000000);
 	m_maincpu->set_addrmap(AS_PROGRAM, &mac_state::maciici_map);
diff --git a/src/mame/machine/macadb.cpp b/src/mame/machine/macadb.cpp
index f2d7fe357a9..f69c0edefc0 100644
--- a/src/mame/machine/macadb.cpp
+++ b/src/mame/machine/macadb.cpp
@@ -31,7 +31,7 @@ static constexpr int adb_timebase = 2000000;
 
 static constexpr int adb_short = 85;
 static constexpr int adb_long = 157;
-static constexpr int adb_srq = ((85+157)*4);
+static constexpr int adb_srq = ((85+157)*3);
 
 // ADB line states
 enum