diff --git a/src/vid_unk_ramdac.c b/src/vid_unk_ramdac.c
index c5c09da14..77d551d8f 100644
--- a/src/vid_unk_ramdac.c
+++ b/src/vid_unk_ramdac.c
@@ -10,6 +10,7 @@
 void unk_ramdac_out(uint16_t addr, uint8_t val, unk_ramdac_t *ramdac, svga_t *svga)
 {
         //pclog("OUT RAMDAC %04X %02X\n",addr,val);
+	int oldbpp = 0;
         switch (addr)
         {
                 case 0x3C6:
@@ -17,6 +18,7 @@ void unk_ramdac_out(uint16_t addr, uint8_t val, unk_ramdac_t *ramdac, svga_t *sv
                 {
                         ramdac->state = 0;
                         ramdac->ctrl = val;
+#if 0
                         switch ((val&1)|((val&0xE0)>>4))
                         {
                                 case 0: case 1: case 2: case 3:
@@ -35,8 +37,30 @@ void unk_ramdac_out(uint16_t addr, uint8_t val, unk_ramdac_t *ramdac, svga_t *sv
                                 svga->bpp = 16;
                                 break;
                         }
-			svga_recalctimings(svga);
-			pclog("unk_ramdac: set to %02X, %i bpp\n", (val&1)|((val&0xE0)>>4), svga->bpp);
+#endif
+			oldbpp = svga->bpp;
+                        switch ((val&1)|((val&0xC0)>>8))
+                        {
+                                case 0:
+                                svga->bpp = 8;
+                                break;
+                                case 2: case 3:
+                                svga->bpp = 24;
+                                break;
+                                case 4: case 5:
+                                svga->bpp = 15;
+                                break;
+                                case 6:
+                                svga->bpp = 16;
+                                break;
+				case 1: case 7: default:
+				break;
+                        }
+			if (oldbpp != svga->bpp)
+			{
+				svga_recalctimings(svga);
+				pclog("unk_ramdac: set to %02X, %i bpp\n", (val&1)|((val&0xE0)>>4), svga->bpp);
+			}
                         return;
                 }
                 ramdac->state = 0;