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Diffstat (limited to 'src/mame/drivers/macpwrbk030.cpp')
-rw-r--r--src/mame/drivers/macpwrbk030.cpp6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/mame/drivers/macpwrbk030.cpp b/src/mame/drivers/macpwrbk030.cpp
index 5c92ef275fa..f18ad6d5ce3 100644
--- a/src/mame/drivers/macpwrbk030.cpp
+++ b/src/mame/drivers/macpwrbk030.cpp
@@ -267,8 +267,9 @@ private:
int m_adb_line;
void set_adb_line(int state) { m_adb_line = state; }
u8 pmu_adb_r() { return (m_adb_line<<1); }
- void pmu_adb_w(u8 data) { m_macadb->adb_linechange_w(data & 1); }
- u8 pmu_in_r() { return 0x20; } // bit 5 is 0 if the Target Disk Mode should be enabled on the PB100
+ void pmu_adb_w(u8 data) { m_macadb->adb_linechange_w((data & 1) ^ 1); }
+
+ u8 pmu_in_r() { return 0x20; } // bit 5 is 0 if the Target Disk Mode should be enabled
};
// 4-level grayscale
@@ -520,6 +521,7 @@ TIMER_CALLBACK_MEMBER(macpb030_state::mac_6015_tick)
m_via1->write_ca1(m_ca1_data);
m_pmu->set_input_line(m50753_device::M50753_INT1_LINE, ASSERT_LINE);
+ m_macadb->adb_vblank();
if (++m_irq_count == 60)
{