diff --git a/CMakeLists.txt b/CMakeLists.txt
index f381719..a013672 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,6 +31,7 @@ set(SOURCES
   src/gint/kmalloc.c
   src/gint/overclock.c
   src/gint/ram.c
+  src/gint/render.c
   src/gint/rtc.c
   src/gint/spuram.c
   src/gint/timer.c
diff --git a/include/gintctl/gint.h b/include/gintctl/gint.h
index 9bd00f3..6102ad2 100644
--- a/include/gintctl/gint.h
+++ b/include/gintctl/gint.h
@@ -44,6 +44,9 @@ void gintctl_gint_dma(void);
 /* gintctl_gint_rtc(): Configure RTC and check timer speed */
 void gintctl_gint_rtc(void);
 
+/* gintctl_gint_render(): Test basic rendering functions */
+void gintctl_gint_render(void);
+
 /* gintctl_gint_image(): Test image rendering */
 void gintctl_gint_image(void);
 
diff --git a/src/gint/image.c b/src/gint/image.c
index a67e7b2..92e3fa7 100644
--- a/src/gint/image.c
+++ b/src/gint/image.c
@@ -1,4 +1,3 @@
-#define GINT_NEED_VRAM
 #include <gint/display.h>
 #include <gint/keyboard.h>
 
diff --git a/src/gint/render.c b/src/gint/render.c
new file mode 100644
index 0000000..121e580
--- /dev/null
+++ b/src/gint/render.c
@@ -0,0 +1,52 @@
+#define __BSD_VISIBLE 1
+#include <gint/display.h>
+#include <gint/keyboard.h>
+#include <gintctl/util.h>
+#include <math.h>
+
+static void hexa_shape(int x, int y, int r, float alpha)
+{
+	int xs[6], ys[6];
+	for(int i = 0; i < 6; i++) {
+		xs[i] = x + r * cosf(alpha + 1.57 + i * (2*M_PI/6));
+		ys[i] = y + r * sinf(alpha + 1.57 + i * (2*M_PI/6));
+	}
+
+	for(int i = 0; i < 6; i++) {
+		int j = (i + 1) % 6;
+		dline(xs[i], ys[i], xs[j], ys[j], C_BLACK);
+	}
+	dline(xs[0], ys[0], xs[2], ys[2], C_BLACK);
+	dline(xs[2], ys[2], xs[5], ys[5], C_BLACK);
+	dline(xs[5], ys[5], xs[3], ys[3], C_BLACK);
+	dline(xs[3], ys[3], xs[1], ys[1], C_BLACK);
+	dline(xs[1], ys[1], xs[4], ys[4], C_BLACK);
+	dline(xs[4], ys[4], xs[0], ys[0], C_BLACK);
+}
+
+void gintctl_gint_render(void)
+{
+	dclear(C_WHITE);
+	drect_border(1, 1, DWIDTH-2, DHEIGHT-2, C_NONE, 1, C_BLACK);
+
+#ifdef FXCG50
+	drect_border(3, 3, DWIDTH-4, DHEIGHT-4, C_NONE, 1, C_BLACK);
+#endif
+
+	hexa_shape(DWIDTH/2, DHEIGHT/2, _(24, 72), 0.0);
+
+	for(int y = _(3,5); y < DHEIGHT - _(3,5); y++)
+	for(int x = _(3,5); x < DWIDTH - _(3,5); x++) {
+		if(dgetpixel(x-1, y) == C_BLACK
+		|| dgetpixel(x+1, y) == C_BLACK
+		|| dgetpixel(x, y-1) == C_BLACK
+		|| dgetpixel(x, y+1) == C_BLACK)
+			continue;
+
+		if((x ^ y) & 1) dpixel(x, y, C_BLACK);
+	}
+
+	dupdate();
+
+	while(getkey().key != KEY_EXIT) {}
+}
diff --git a/src/gintctl.c b/src/gintctl.c
index 33aa5f7..c7abfcb 100644
--- a/src/gintctl.c
+++ b/src/gintctl.c
@@ -1,5 +1,3 @@
-#define GINT_NEED_VRAM
-
 #include <gint/display.h>
 #include <gint/keyboard.h>
 #include <gint/gint.h>
@@ -53,6 +51,7 @@ struct menu menu_gint = {
 	{ "DMA control",        gintctl_gint_dma, MENU_SH4_ONLY },
 	{ "Real-time clock",    gintctl_gint_rtc, 0 },
 	{ "USB communication",  gintctl_gint_usb, MENU_SH4_ONLY },
+	{ "Basic rendering",    gintctl_gint_render, 0 },
 	{ "Image rendering",    gintctl_gint_image, 0 },
 	{ "Text rendering",     gintctl_gint_topti, 0 },
 	#ifdef FX9860G
diff --git a/src/util.c b/src/util.c
index 84f6bb4..67bba5c 100644
--- a/src/util.c
+++ b/src/util.c
@@ -88,8 +88,7 @@ void row_highlight(int row)
 	#endif
 
 	#ifdef FXCG50
-	uint32_t *long_vram = (void *)gint_vram;
-	for(int i = 198 * y1; i < 198 * y2; i++) long_vram[i] = ~long_vram[i];
+	drect(0, y1, DWIDTH - 1, y2 - 1, C_INVERT);
 	#endif
 }