From b0282ecc8a802236f9cc82ceb8449c3590d4f555 Mon Sep 17 00:00:00 2001
From: Brandon Wright <bearoso@gmail.com>
Date: Wed, 30 May 2018 17:45:36 -0500
Subject: [PATCH] Make note and clarify code.

---
 dma.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dma.cpp b/dma.cpp
index 6d32cbd3..c3aa4762 100644
--- a/dma.cpp
+++ b/dma.cpp
@@ -1641,8 +1641,10 @@ uint8 S9xDoHDMA (uint8 byte)
 								case 1:
 									S9xSetPPU(*(HDMAMemPointers[d] + 0), 0x2100 + p->BAddress);
 									ADD_CYCLES(SLOW_ONE_CYCLE);
-									S9xSetPPU(*(HDMAMemPointers[d] + 1), 0x2101 + p->BAddress);
+									// XXX: All HDMA should read to MDR first. This one just
+									// happens to fix Speedy Gonzales.
 									OpenBus = *(HDMAMemPointers[d] + 1);
+									S9xSetPPU(OpenBus, 0x2101 + p->BAddress);
 									ADD_CYCLES(SLOW_ONE_CYCLE);
 									HDMAMemPointers[d] += 2;
 									break;