diff --git a/src/mame/includes/namcos21.h b/src/mame/includes/namcos21.h
index 87720852ed1..50dcf887014 100644
--- a/src/mame/includes/namcos21.h
+++ b/src/mame/includes/namcos21.h
@@ -73,6 +73,7 @@ public:
 	optional_device<namco_c148_device> m_gpu_intc;
 	
 	std::unique_ptr<uint8_t[]> m_videoram;
+	std::unique_ptr<uint8_t[]> m_colorram;
 	std::unique_ptr<uint16_t[]> m_winrun_dspcomram;
 	uint16_t m_winrun_poly_buf[WINRUN_MAX_POLY_PARAM];
 	int m_winrun_poly_index;
diff --git a/src/mame/video/namcos21.cpp b/src/mame/video/namcos21.cpp
index b3aed4c0d6a..af0c08d3de9 100644
--- a/src/mame/video/namcos21.cpp
+++ b/src/mame/video/namcos21.cpp
@@ -52,7 +52,6 @@ WRITE16_MEMBER(namcos21_state::winrun_gpu_register_w)
 
 WRITE16_MEMBER(namcos21_state::winrun_gpu_videoram_w)
 {
-	uint8_t *videoram = m_videoram.get();
 	int color = data>>8;
 	int mask  = data&0xff;
 	int i;
@@ -60,15 +59,15 @@ WRITE16_MEMBER(namcos21_state::winrun_gpu_videoram_w)
 	{
 		if( mask&(0x01<<i) )
 		{
-			videoram[(offset+i)&0x7ffff] = color;
+			m_videoram[(offset+i)&0x7ffff] = color;
+			m_colorram[(offset+i)&0x7ffff] = mask;
 		}
 	}
 }
 
 READ16_MEMBER(namcos21_state::winrun_gpu_videoram_r)
 {
-	uint8_t *videoram = m_videoram.get();
-	return videoram[offset]<<8;
+	return (m_videoram[offset]<<8) | m_colorram[offset];
 }
 
 void namcos21_state::allocate_poly_framebuffer()
@@ -363,6 +362,7 @@ VIDEO_START_MEMBER(namcos21_state,namcos21)
 	if( m_gametype == NAMCOS21_WINRUN91 )
 	{
 		m_videoram = std::make_unique<uint8_t[]>(0x80000);
+		m_colorram = std::make_unique<uint8_t[]>(0x80000);
 	}
 	allocate_poly_framebuffer();
 	c355_obj_init(