From 896f4bd21c98ab294119a54bd22e6325261d1315 Mon Sep 17 00:00:00 2001
From: Happy <Happy-yappH@users.noreply.github.com>
Date: Thu, 21 Apr 2016 14:23:07 -0600
Subject: [PATCH] N64: Adjust SI timing . . .  again.

---
 src/mame/machine/n64.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/mame/machine/n64.cpp b/src/mame/machine/n64.cpp
index b7968787d94..2b234497315 100644
--- a/src/mame/machine/n64.cpp
+++ b/src/mame/machine/n64.cpp
@@ -2089,6 +2089,11 @@ void n64_periphs::si_dma_tick()
 
 void n64_periphs::pif_dma(int direction)
 {
+	if(si_status & 1)
+	{
+		si_status |= 8; //DMA Error, overlapping request		
+		return; // SI Busy, ignore request
+	}
 	if (!DWORD_ALIGNED(si_dram_addr))
 	{
 		fatalerror("pif_dma: si_dram_addr unaligned: %08X\n", si_dram_addr);
@@ -2127,7 +2132,7 @@ void n64_periphs::pif_dma(int direction)
 		}
 	}
 	si_status |= 1;
-	si_dma_timer->adjust(attotime::from_hz(10000));
+	si_dma_timer->adjust(attotime::from_hz(50000));
 }
 
 READ32_MEMBER( n64_periphs::si_reg_r )