--- a/bindings.c	Fri Nov 09 09:26:07 2018 -0800
+++ b/bindings.c	Fri Nov 09 20:16:09 2018 -0800
@@ -37,7 +37,8 @@
 	UI_SMS_PAUSE,
 	UI_SCREENSHOT,
 	UI_EXIT,
-	UI_PLANE_DEBUG
+	UI_PLANE_DEBUG,
+	UI_VRAM_DEBUG
 } ui_action;
 
 typedef struct {
@@ -388,6 +389,20 @@
 			}
 			break;
 		}
+		case UI_VRAM_DEBUG: {
+			vdp_context *vdp = NULL;
+			if (current_system->type == SYSTEM_GENESIS) {
+				genesis_context *gen = (genesis_context *)current_system;
+				vdp = gen->vdp;
+			} else if (current_system->type == SYSTEM_SMS) {
+				sms_context *sms = (sms_context *)current_system;
+				vdp = sms->vdp;
+			}
+			if (vdp) {
+				vdp_toggle_debug_view(vdp, VDP_DEBUG_VRAM);
+			}
+			break;
+		}
 		}
 		break;
 	}
@@ -593,7 +608,9 @@
 			*subtype_a = UI_EXIT;
 		} else if (!strcmp(target + 3, "plane_debug")) {
 			*subtype_a = UI_PLANE_DEBUG;
-		} else {
+		} else if (!strcmp(target + 3, "vram_debug")) {
+			*subtype_a = UI_VRAM_DEBUG;
+		}  else {
 			warning("Unreconized UI binding type %s\n", target);
 			return 0;
 		}