From adb70b62c34cdf97c37a29cb1094eeec82ab4851 Mon Sep 17 00:00:00 2001
From: jborza <jborza@gmail.com>
Date: Wed, 1 May 2019 21:10:12 +0200
Subject: [PATCH] fixed status register handling in PLP (bit 4 now not read)

---
 cpu.c      | 2 ++
 test6502.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/cpu.c b/cpu.c
index e6f8f22..b44672d 100644
--- a/cpu.c
+++ b/cpu.c
@@ -342,6 +342,8 @@ void PLA_(State6502* state) {
 
 void PLP_(State6502* state) {
 	byte value = pop_byte_from_stack(state);
+	//we don't read the BRK flag
+	value ^= 1 << 4;
 	memset(&state->flags, value, sizeof(Flags));
 }
 
diff --git a/test6502.c b/test6502.c
index 881ce17..5c3e33a 100644
--- a/test6502.c
+++ b/test6502.c
@@ -1957,7 +1957,7 @@ void test_PLP() {
 	assert_sp(&state, 0xFF);
 	assert_flag_c(&state, 1);
 	assert_flag_d(&state, 1);
-	assert_flag_b(&state, 1);
+	assert_flag_b(&state, 0);
 	assert_flag_z(&state, 1);
 	assert_flag_v(&state, 1);
 	assert_flag_n(&state, 1);