From e2956881b9f429f8b587b810546653ced848ce73 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C3=ABl=20Banaan=20Ananas?=
 <happppp@users.noreply.github.com>
Date: Thu, 30 May 2013 15:23:23 +0000
Subject: [PATCH] nevermind this yet

---
 src/emu/machine/7200fifo.c | 9 +++++----
 src/emu/machine/7200fifo.h | 8 ++------
 2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/src/emu/machine/7200fifo.c b/src/emu/machine/7200fifo.c
index 1fbc5f76570..da998e575ac 100644
--- a/src/emu/machine/7200fifo.c
+++ b/src/emu/machine/7200fifo.c
@@ -4,6 +4,7 @@
 
     TODO:
     - retransmit (RT pin)
+    - cascaded width expansion mode (when needed)
 
 **********************************************************************/
 
@@ -71,7 +72,7 @@ void fifo7200_device::device_reset()
 
 
 
-void fifo7200_device::fifo_write(UINT32 data)
+void fifo7200_device::fifo_write(UINT16 data)
 {
 	if (m_ff)
 	{
@@ -79,7 +80,7 @@ void fifo7200_device::fifo_write(UINT32 data)
 		return;
 	}
 
-	m_buffer[m_write_ptr] = data;
+	m_buffer[m_write_ptr] = data & 0x1ff;
 	m_write_ptr = (m_write_ptr + 1) % m_ram_size;
 	
 	// update flags
@@ -102,12 +103,12 @@ void fifo7200_device::fifo_write(UINT32 data)
 	}
 }
 
-UINT32 fifo7200_device::fifo_read()
+UINT16 fifo7200_device::fifo_read()
 {
 	if (m_ef)
 	{
 		logerror("IDT7200 %s fifo_read underflow!\n", tag());
-		return ~0;
+		return 0x1ff;
 	}
 	
 	UINT16 ret = m_buffer[m_read_ptr];
diff --git a/src/emu/machine/7200fifo.h b/src/emu/machine/7200fifo.h
index d4abe552ed7..189bc3a9b06 100644
--- a/src/emu/machine/7200fifo.h
+++ b/src/emu/machine/7200fifo.h
@@ -102,18 +102,14 @@ public:
 	DECLARE_WRITE8_MEMBER( data_byte_w ) { fifo_write(data); }
 	DECLARE_READ8_MEMBER( data_byte_r ) { return (UINT8)fifo_read(); }
 
-	// use these for configurations in cascaded width expansion mode using more than 16 bits
-	DECLARE_WRITE32_MEMBER( data_dword_w ) { fifo_write(data); }
-	DECLARE_READ32_MEMBER( data_dword_r ) { return (UINT32)fifo_read(); }
-
 protected:
 	// device-level overrides
 	virtual void device_start();
 	virtual void device_reset();
 
 private:
-	void fifo_write(UINT32 data);
-	UINT32 fifo_read();
+	void fifo_write(UINT16 data);
+	UINT16 fifo_read();
 
 	UINT16* m_buffer;
 	int m_ram_size;