From a5a5c7af4a6be543b9b3bbe504410b38b82a004b Mon Sep 17 00:00:00 2001
From: AJR <ajrhacker@users.noreply.github.com>
Date: Thu, 2 May 2019 18:14:38 -0400
Subject: [PATCH] ms9540: Some diagnostic value, no real improvement (nw)

---
 src/mame/drivers/ms9540.cpp | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/src/mame/drivers/ms9540.cpp b/src/mame/drivers/ms9540.cpp
index 8515038fbcb..4476248e999 100644
--- a/src/mame/drivers/ms9540.cpp
+++ b/src/mame/drivers/ms9540.cpp
@@ -41,9 +41,15 @@ public:
 	void ms9540(machine_config &config);
 
 private:
+	uint8_t latch_1e001_r();
+	void latch_1e001_w(u8 data);
+	uint8_t latch_1f001_r();
+	void latch_1f001_w(u8 data);
 	void kbd_put(u8 data);
 	void mem_map(address_map &map);
 	uint8_t m_term_data;
+	uint8_t m_latch_1e001;
+	uint8_t m_latch_1f001;
 	virtual void machine_reset() override;
 	required_shared_ptr<uint16_t> m_p_base;
 	required_device<cpu_device> m_maincpu;
@@ -51,13 +57,36 @@ private:
 };
 
 
+uint8_t ms9540_state::latch_1e001_r()
+{
+	return m_latch_1e001;
+}
+
+void ms9540_state::latch_1e001_w(uint8_t data)
+{
+	logerror("%s: $1e001 <- #$%02x\n", machine().describe_context(), data);
+	m_latch_1e001 = data;
+}
+
+uint8_t ms9540_state::latch_1f001_r()
+{
+	return m_latch_1f001;
+}
+
+void ms9540_state::latch_1f001_w(uint8_t data)
+{
+	logerror("%s: $1f001 <- #$%02x\n", machine().describe_context(), data);
+	m_latch_1f001 = data;
+}
+
 void ms9540_state::mem_map(address_map &map)
 {
 	map.unmap_value_high();
-	map.global_mask(0xffffff);
 	map(0x000000, 0x00ffff).ram().share("rambase");
 	map(0x010000, 0x013fff).rom().region("9540", 0);
 	map(0x018000, 0x018fff).ram();
+	map(0x01e001, 0x01e001).rw(FUNC(ms9540_state::latch_1e001_r), FUNC(ms9540_state::latch_1e001_w));
+	map(0x01f001, 0x01f001).rw(FUNC(ms9540_state::latch_1f001_r), FUNC(ms9540_state::latch_1f001_w));
 }