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Diffstat (limited to 'src/mame/drivers/lwriter.cpp')
-rw-r--r--src/mame/drivers/lwriter.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mame/drivers/lwriter.cpp b/src/mame/drivers/lwriter.cpp
index f6839e095a7..63b6ccf5df9 100644
--- a/src/mame/drivers/lwriter.cpp
+++ b/src/mame/drivers/lwriter.cpp
@@ -535,7 +535,9 @@ void lwriter_state::lwriter(machine_config &config)
m_scc->out_dtrb_callback().set(FUNC(lwriter_state::write_dtr));
m_scc->out_rtsb_callback().set("rs232b", FUNC(rs232_port_device::write_rts));
/* Interrupt */
- m_scc->out_int_callback().set(m_via, FUNC(via6522_device::write_ca1));
+ // The "CA1 Latch/Interrupt Control" bit in VIA PCR gets set to "negative
+ // active edge" so we invert the SCC interrupt.
+ m_scc->out_int_callback().set(m_via, FUNC(via6522_device::write_ca1)).invert();
//m_scc->out_int_callback().set(FUNC(lwriter_state::scc_int));
rs232_port_device &rs232a(RS232_PORT(config, "rs232a", default_rs232_devices, "terminal"));