core, adjustment for background color DMA

diff --git a/pico/videoport.c b/pico/videoport.c
index 9663e2b..9c35162 100644 (file)
--- a/pico/videoport.c
+++ b/pico/videoport.c
@@ -626,7 +626,8 @@ static void DmaSlow(int len, u32 source)
         if (sl > VdpFIFO.fifo_hcounts[0]-5) // hint delay is 5 slots\r
           sl = (s8)sl;\r
         // TODO this is needed to cover timing inaccuracies\r
-        if (sl <= 12) sl = -2;\r
+        if (sl <= 12) sl = -3;\r
+        else if (sl <= 40) sl = 30;\r
         PicoDrawBgcDMA(base, source, mask, len, sl);\r
         // do last DMA cycle since it's all going to the same cram location\r
         source = source+len-1;\r