diff --git a/src/mame/drivers/coolridr.c b/src/mame/drivers/coolridr.c
index b18e160241c..4972e4f5b7a 100644
--- a/src/mame/drivers/coolridr.c
+++ b/src/mame/drivers/coolridr.c
@@ -480,6 +480,7 @@ public:
 	void flush_pal_data( UINT16 offset );
 	int m_gfx_index;
 	int m_color_bank;
+	UINT32 m_rgb_ctrl[2];
 
 	osd_work_queue *    m_work_queue[2]; // work queue, one per screen
 	static void *draw_tile_row_threaded(void *param, int threadid);
@@ -1782,13 +1783,44 @@ WRITE32_MEMBER(coolridr_state::sysh1_unk_blit_w)
 	}
 }
 
-
 void coolridr_state::flush_pal_data( UINT16 offset )
 {
 	int r,g,b;
+	int screen_type = (offset & 0x400) >> 10;
+	int rgb_setting = m_rgb_ctrl[screen_type] & ~0x1f;
+	int rgb_gradient = m_rgb_ctrl[screen_type] & 0x1f;
+
 	r = ((m_h1_pal[offset] & 0x7c00) >> 10);
 	g = ((m_h1_pal[offset] & 0x03e0) >> 5);
 	b = ((m_h1_pal[offset] & 0x001f) >> 0);
+	if(rgb_setting == 0x1240) /* fade-in / outs */
+	{
+		r -= rgb_gradient;
+		g -= rgb_gradient;
+		b -= rgb_gradient;
+		if(r < 0) { r = 0; }
+		if(g < 0) { g = 0; }
+		if(b < 0) { b = 0; }
+	}
+	else if(rgb_setting == 0x920) /* at bike select, addition */
+	{
+		r += rgb_gradient;
+		g += rgb_gradient;
+		b += rgb_gradient;
+		if(r > 0x1f) { r = 0x1f; }
+		if(g > 0x1f) { g = 0x1f; }
+		if(b > 0x1f) { b = 0x1f; }
+	}
+	else if(rgb_setting == 0x800) /* when you get hit TODO: algo might be different. */
+	{
+		g &= (0x1f - rgb_gradient);
+		b &= (0x1f - rgb_gradient);
+	}
+	else if(rgb_gradient)
+	{
+		popmessage("%08x %08x",rgb_setting,rgb_gradient);
+	}
+
 	palette_set_color_rgb(machine(),offset,pal5bit(r),pal5bit(g),pal5bit(b));
 }
 
@@ -1837,7 +1869,6 @@ void coolridr_state::sysh1_dma_transfer( address_space &space, UINT16 dma_index
 					printf("unk values to %02x dst %08x\n",cmd,dst);
 				dst &= 0x000fffff;
 
-				/* TODO: might as well improve the dirty handling */
 				for(int i=0;i<size;i++)
 				{
 					m_h1_pcg[dst] = space.read_byte(src);
@@ -1876,13 +1907,18 @@ void coolridr_state::sysh1_dma_transfer( address_space &space, UINT16 dma_index
 			case 0x24: /* unknown table */
 			case 0x30: /* screen 1 - 0x80 at boot, then 0x808080  */
 			case 0x34: /* screen 2 / */
-			case 0x40: /* screen 1 - almost certainly RGB brightness (at least bits 4 - 0) */
-			case 0x44: /* screen 2 / */
 			case 0x50: /* screen 1 - unknown */
 			case 0x54: /* screen 2 / */
 				//printf("%02x %08x\n",cmd,m_framebuffer_vram[(0+dma_index)/4]);
 				dma_index+=4;
 				break;
+			case 0x40: /* screen 1 - almost certainly RGB brightness (at least bits 4 - 0) */
+			case 0x44: /* screen 2 / */
+				m_rgb_ctrl[(cmd & 4) >> 2] = m_framebuffer_vram[(0+dma_index)/4] & 0xffffff;
+				for(int i=((cmd & 4) * 0x100);i<((cmd & 4) * 0x100)+0x400;i++)
+					flush_pal_data( i );
+				dma_index+=4;
+				break;
 			default:
 				printf("%02x %08x\n",cmd,m_framebuffer_vram[(0+dma_index)/4]);
 				dma_index+=4;