diff --git a/src/vid_ati68860_ramdac.c b/src/vid_ati68860_ramdac.c
index 1c3c1aa..900e0ce 100644
--- a/src/vid_ati68860_ramdac.c
+++ b/src/vid_ati68860_ramdac.c
@@ -55,7 +55,7 @@ void ati68860_ramdac_out(uint16_t addr, uint8_t val, ati68860_ramdac_t *ramdac,
                                 case 0x83:
                                 ramdac->render = svga_render_8bpp_highres;
                                 break;
-                                case 0xa0:
+                                case 0xa0: case 0xb0:
                                 ramdac->render = svga_render_15bpp_highres;
                                 break;
                                 case 0xa1: case 0xb1: