diff --git a/src/devices/video/dl1416.cpp b/src/devices/video/dl1416.cpp
index 752dbc2af13..3925d9b9607 100644
--- a/src/devices/video/dl1416.cpp
+++ b/src/devices/video/dl1416.cpp
@@ -189,7 +189,9 @@ dl1414_device::dl1414_device(
 	, m_cursor_state{ false, false, false, false }
 	, m_wr_in(true)
 	, m_ce_in(true)
+	, m_ce_latch(true)
 	, m_addr_in(0x00)
+	, m_addr_latch(0x00)
 	, m_data_in(0x00)
 {
 }
@@ -221,13 +223,17 @@ void dl1414_device::device_start()
 	save_item(NAME(m_cursor_state));
 	save_item(NAME(m_wr_in));
 	save_item(NAME(m_ce_in));
+	save_item(NAME(m_ce_latch));
 	save_item(NAME(m_addr_in));
+	save_item(NAME(m_addr_latch));
 	save_item(NAME(m_data_in));
 
 	// set initial state for input lines
 	m_wr_in = true;
 	m_ce_in = true;
+	m_ce_latch = true;
 	m_addr_in = 0x00;
+	m_addr_latch = 0x00;
 	m_data_in = 0x00;
 
 	// randomise internal RAM
@@ -272,8 +278,16 @@ WRITE_LINE_MEMBER( dl1414_device::wr_w )
 	if (bool(state) != m_wr_in)
 	{
 		m_wr_in = bool(state);
-		if (!m_ce_in && m_wr_in)
-			bus_w(machine().dummy_space(), m_addr_in, m_data_in, 0x7f);
+		if (m_wr_in)
+		{
+			if (!m_ce_latch)
+				bus_w(machine().dummy_space(), m_addr_latch, m_data_in, 0x7f);
+		}
+		else
+		{
+			m_ce_latch = m_ce_in;
+			m_addr_latch = m_addr_in;
+		}
 	}
 }
 
diff --git a/src/devices/video/dl1416.h b/src/devices/video/dl1416.h
index 46672fd7a85..e5f5a894321 100644
--- a/src/devices/video/dl1416.h
+++ b/src/devices/video/dl1416.h
@@ -81,8 +81,8 @@ private:
 
 	// input line state
 	bool m_wr_in;
-	bool m_ce_in;
-	uint8_t m_addr_in;
+	bool m_ce_in, m_ce_latch;
+	uint8_t m_addr_in, m_addr_latch;
 	uint8_t m_data_in;
 };
 
diff --git a/src/mame/drivers/sitcom.cpp b/src/mame/drivers/sitcom.cpp
index 468737ba611..d67c35b12bd 100644
--- a/src/mame/drivers/sitcom.cpp
+++ b/src/mame/drivers/sitcom.cpp
@@ -111,6 +111,7 @@ public:
 	DECLARE_READ_LINE_MEMBER(shutter_r);
 
 	DECLARE_INPUT_CHANGED_MEMBER(update_shutter);
+	DECLARE_INPUT_CHANGED_MEMBER(update_speed);
 
 protected:
 	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
@@ -180,7 +181,7 @@ INPUT_PORTS_START( sitcomtmr )
 	PORT_BIT( 0xf8, IP_ACTIVE_LOW, IPT_UNUSED )
 
 	PORT_START("SPEED")
-	PORT_CONFNAME(0xff, 0x1e, "Shutter Speed")
+	PORT_CONFNAME(0xff, 0x1e, "Shutter Speed") PORT_CHANGED_MEMBER(DEVICE_SELF, sitcom_timer_state, update_speed, 0)
 	PORT_CONFSETTING(0x00, "B")
 	PORT_CONFSETTING(0x01, "1")
 	PORT_CONFSETTING(0x02, "1/2")
@@ -270,6 +271,18 @@ INPUT_CHANGED_MEMBER( sitcom_timer_state::update_shutter )
 	}
 }
 
+INPUT_CHANGED_MEMBER( sitcom_timer_state::update_speed )
+{
+	if (!newval)
+	{
+		m_shutter = bool(BIT(m_buttons->read(), 2));
+	}
+	else if (!oldval)
+	{
+		m_shutter = false;
+	}
+}
+
 void sitcom_timer_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
 {
 	switch (id)
diff --git a/src/mame/machine/aim65.cpp b/src/mame/machine/aim65.cpp
index d3e333db8d8..d68e7663250 100644
--- a/src/mame/machine/aim65.cpp
+++ b/src/mame/machine/aim65.cpp
@@ -10,6 +10,9 @@
 #include "emu.h"
 #include "includes/aim65.h"
 
+//#define VERBOSE 1
+#include "logmacro.h"
+
 
 /******************************************************************************
  Interrupt handling
@@ -46,17 +49,20 @@
 
 WRITE8_MEMBER( aim65_state::aim65_pia_a_w )
 {
+	LOG("pia a: a=%u /ce=%u,%u,%u,%u,%u /wr=%u\n",
+			data & 0x03, BIT(data, 2), BIT(data, 3), BIT(data, 4), BIT(data, 5), BIT(data, 6), BIT(data, 7));
 	for (std::size_t index = 0; m_ds.size() > index; ++index)
 	{
-		m_ds[index]->addr_w(data & 0x03);
-		m_ds[index]->ce_w(BIT(data, 2 + index));
 		m_ds[index]->wr_w(BIT(data, 7));
+		m_ds[index]->ce_w(BIT(data, 2 + index));
+		m_ds[index]->addr_w(data & 0x03);
 	}
 }
 
 
 WRITE8_MEMBER( aim65_state::aim65_pia_b_w )
 {
+	LOG("pia b: d=%02x /cu=%u\n", data & 0x7f, BIT(data, 7));
 	for (required_device<dl1416_device> &ds : m_ds)
 	{
 		ds->cu_w(BIT(data, 7));