diff --git a/CMakeLists.txt b/CMakeLists.txt
index 076dffb..8ea5cd3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -246,7 +246,34 @@ set(SOURCES_CG
 )
 
 set(SOURCES_FXASCG
-  # R61524 driver
+  # Gray engine
+  src/gray/engine.c
+  src/gray/gclear.c
+  src/gray/ggetpixel.c
+  src/gray/gint_gline.c
+  src/gray/gpixel.c
+  src/gray/grect.c
+  src/gray/gsubimage.c
+  src/gray/gtext.c
+  # Rendering
+  src/render-fx/bopti-asm-gray-scsp.s
+  src/render-fx/bopti-asm-gray.s
+  src/render-fx/bopti-asm-mono-scsp.s
+  src/render-fx/bopti-asm.s
+  src/render-fx/bopti.c
+  src/render-fx/dclear.c
+  src/render-fx/dgetpixel.c
+  src/render-fx/dpixel.c
+  src/render-fx/drect.c
+  src/render-fx/dsubimage.c
+  src/render-fx/gint_dline.c
+  src/render-fx/masks.c
+  src/render-fx/topti-asm.s
+  src/render-fx/topti.c
+  #special dupdate functions to treat a FX VRAM and convert to a CG VRAM
+  src/render-fxascg/dupdate.c
+  # R61524 driver as we are working with a CG50
+  src/r61524/r61524.c
 )
 
 set(ASSETS_FX
@@ -290,7 +317,7 @@ if("${FXSDK_PLATFORM_LONG}" STREQUAL fx9860G_AS_CG)
   set(LINKER_SCRIPTS
     "${CMAKE_CURRENT_BINARY_DIR}/fxcg50.ld"
     "${CMAKE_CURRENT_BINARY_DIR}/fxcg50_fastload.ld")
-  add_library(gint-fxascg STATIC ${SOURCES_COMMON} ${SOURCES_CG} ${SOURCES_FXASCG} ${ASSETS_FX}
+  add_library(gint-fxascg STATIC ${SOURCES_COMMON} ${SOURCES_FXASCG} ${ASSETS_FX}
     ${LINKER_SCRIPTS})
 endif()
 
diff --git a/include/gint/display-cg.h b/include/gint/display-cg.h
index e297205..e9fa807 100644
--- a/include/gint/display-cg.h
+++ b/include/gint/display-cg.h
@@ -15,7 +15,7 @@
 #ifndef GINT_DISPLAY_CG
 #define GINT_DISPLAY_CG
 
-#ifdef FXCG50
+#if defined(FXCG50) && !defined(FX9860G_AS_CG)
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/gint/display-fx.h b/include/gint/display-fx.h
index af85e43..eb4eff6 100644
--- a/include/gint/display-fx.h
+++ b/include/gint/display-fx.h
@@ -9,7 +9,7 @@
 #ifndef GINT_DISPLAY_FX
 #define GINT_DISPLAY_FX
 
-#ifdef FX9860G
+#if defined(FX9860G) || defined(FX9860G_AS_CG)
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/gint/display.h b/include/gint/display.h
index 599fd15..7236800 100644
--- a/include/gint/display.h
+++ b/include/gint/display.h
@@ -19,11 +19,11 @@ extern "C" {
 /* Platform-specific functions include VRAM management and the definition of
    the color_t type. */
 
-#ifdef FX9860G
+#if defined(FX9860G) || defined(FX9860G_AS_CG)
 #include <gint/display-fx.h>
 #endif
 
-#ifdef FXCG50
+#if defined(FXCG50) && ! defined(FX9860G_AS_CG)
 #include <gint/display-cg.h>
 #endif
 
diff --git a/src/render-fxascg/dupdate.c b/src/render-fxascg/dupdate.c
new file mode 100644
index 0000000..be5d455
--- /dev/null
+++ b/src/render-fxascg/dupdate.c
@@ -0,0 +1,97 @@
+#include <gint/display.h>
+#include <gint/kmalloc.h>
+#include <gint/config.h>
+#include <gint/drivers/r61524.h>
+#include "../render-fx/render-fx.h"
+
+/* The destination VRAM for upscaling + centering + conversion B&W --> 16bits RGB565  */
+uint16_t *cg_vram; // set to 0 at initialisation
+
+/* Standard video RAM for fx9860g is 1 bit per pixel */
+GALIGNED(32) static uint32_t fx_vram[256];
+
+/* Here is the definition of the VRAM pointer, exposed in <gint/display.h> */
+uint32_t *gint_vram = fx_vram;
+
+/* The current rendering mode */
+struct rendering_mode const *dmode = NULL;
+
+
+bool dvram_init( void )
+{
+	int const MARGIN = 32;
+
+	/* Leave MARGIN bytes on each side of the region; this enables some
+	   important optimizations in the image renderer. We also add another
+	   32 bytes so we can manually 32-align the region */
+	uint32_t region = (uint32_t)kmalloc(DWIDTH*DHEIGHT*2 + MARGIN*2 + 32,
+#if !defined(GINT_NO_OS_STACK)
+		"_ostk"
+#else
+		NULL
+#endif
+	);
+	if(region == 0)
+		return false;
+
+	/* 32-align the region */
+	region = (region + 31) & -32;
+	/* Skip a MARGIN */
+	region += MARGIN;
+	/* Use an uncached address */
+	region = (region & 0x1fffffff) | 0xa0000000;
+
+	/* Don't enable triple buffering by default */
+	cg_vram = (void *)region;
+	return true;
+}
+
+void dgetvram(uint16_t **ptr_vram_1, uint16_t **ptr_vram_2)
+{
+	if(ptr_vram_1) *ptr_vram_1 = &cg_vram;
+	if(ptr_vram_2) *ptr_vram_2 = &cg_vram;
+}
+
+inline drawupscale( int x, int y, int color )
+{
+    int u=y*396*3*2;
+
+    uint16_t colorcg;
+    
+    if (color==C_WHITE) colorcg=0xFFFF;
+    else colorcg=0x0000;
+
+    int baseindex = (396*16+6+x+u);          // 16 lines on top/bottom remain black and 6 columns on left/right remain black
+    cg_vram[baseindex] = colorcg;
+    cg_vram[baseindex+1] = colorcg;
+    cg_vram[baseindex+2] = colorcg;
+
+    baseindex+=396;
+    cg_vram[baseindex] = colorcg;
+    cg_vram[baseindex+1] = colorcg;
+    cg_vram[baseindex+2] = colorcg;
+
+    baseindex+=396;
+    cg_vram[baseindex] = colorcg;
+    cg_vram[baseindex+1] = colorcg;
+    cg_vram[baseindex+2] = colorcg;
+}
+
+/* dupdate(): Push the video RAM to the display driver */
+void dupdate(void)
+{
+
+    for( int j=0; j<DHEIGHT; j++ )          // 64 lines
+    {
+        for( int i=0; i<DWIDTH; i++ )       // 128 column
+        {
+            drawupscale( i, j, dgetpixel(i,j) );        // really not optimised; just to check if OK
+        } 
+    }
+
+	r61524_display(cg_vram, 0, 224, R61524_DMA_WAIT );
+
+	gint_call(dupdate_get_hook());
+}
+__attribute__((alias("dupdate")))
+void _WEAK_dupdate(void);
\ No newline at end of file