From 0d1f822948be2abfac55dc7131d9369837d72075 Mon Sep 17 00:00:00 2001
From: slack <slack@codemaniacs.com>
Date: Sun, 2 Oct 2011 16:06:12 +0200
Subject: [PATCH] Fixed POP AF instruction (lowest 4 bits in flags are always
 0)

---
 core/GameBoy.cc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/core/GameBoy.cc b/core/GameBoy.cc
index 28d7038..bf789fb 100644
--- a/core/GameBoy.cc
+++ b/core/GameBoy.cc
@@ -629,8 +629,15 @@ GameBoy::run_status GameBoy::run_cycle()
 					PUSH(0xD5, D, E)
 					PUSH(0xE5, H, L)
 
+					// POP AF: special because bits 0-3 in F are always 0
+					case 0xF1:
+					    regs.flags = memory.read(regs.SP) & 0xF0;
+					    regs.A = memory.read(regs.SP+1);
+					    regs.SP += 2;
+					    cycles_until_next_instruction = 12;
+					    break;
+
 					// POP nn
-					POP(0xF1, A, flags)
 					POP(0xC1, B, C)
 					POP(0xD1, D, E)
 					POP(0xE1, H, L)
-- 
2.34.1