From 384d6a98bafbc804a63f307f8b8a56cd68052dc8 Mon Sep 17 00:00:00 2001
From: retro-wertz <retro-wertz@users.noreply.github.com>
Date: Tue, 17 Oct 2017 12:49:12 +0800
Subject: [PATCH] Build fix and add comments

---
 src/boards/57.c | 2 --
 src/boards/69.c | 3 +++
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/boards/57.c b/src/boards/57.c
index df79d44..fb2a11f 100644
--- a/src/boards/57.c
+++ b/src/boards/57.c
@@ -42,11 +42,9 @@ static void Sync(void) {
 	setchr8((regs[0] & 7) | (regs[1] & 7) | ((regs[0] & 0x40) >> 3));
 }
 
-#if 0
 static DECLFR(M57Read) {
 	return hrd_flag;
 }
-#endif
 
 static DECLFW(M57Write) {
 	switch (A & 0x8800) {
diff --git a/src/boards/69.c b/src/boards/69.c
index f1f79a9..0de0558 100644
--- a/src/boards/69.c
+++ b/src/boards/69.c
@@ -89,6 +89,9 @@ static DECLFW(M69Write1) {
 	case 0xA: preg[1] = V; Sync(); break;
 	case 0xB: preg[2] = V; Sync(); break;
 	case 0xC: mirr = V & 3; Sync();break;
+	/* 17/10/17- reg $0D should awknowledge IRQ and no other
+	 * http://forums.nesdev.com/viewtopic.php?f=2&t=12436&start=15
+	 */
 	case 0xD: IRQa = V; X6502_IRQEnd(FCEU_IQEXT); break;
 	case 0xE: IRQCount &= 0xFF00; IRQCount |= V; break;
 	case 0xF: IRQCount &= 0x00FF; IRQCount |= V << 8; break;