diff --git a/CMakeLists.txt b/CMakeLists.txt
index aea9f4a..937b1ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,13 +14,16 @@ elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
 endif()
 
 set(BIN_DIR "${CMAKE_SOURCE_DIR}/bin")
-set(CMAKE_RUNTIME_OUTPUT_DIRECTORY         ${BIN_DIR})
-SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG   ${BIN_DIR})
-SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${BIN_DIR})
-SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_DEBUG   ${BIN_DIR})
-SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE ${BIN_DIR})
-SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG   ${BIN_DIR})
-SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE ${BIN_DIR})
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY                ${BIN_DIR})
+SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG          ${BIN_DIR})
+SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELWITHDEBINFO ${BIN_DIR})
+SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE        ${BIN_DIR})
+SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_DEBUG          ${BIN_DIR})
+SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELWITHDEBINFO ${BIN_DIR})
+SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE        ${BIN_DIR})
+SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG          ${BIN_DIR})
+SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELWITHDEBINFO ${BIN_DIR})
+SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE        ${BIN_DIR})
 
 add_executable(main)
 
@@ -74,7 +77,7 @@ add_test(
 # Could also compare the first lines of each file using technique from https://superuser.com/a/511406
 add_test(NAME blargg_cpu_test5_official_execute COMMAND main CPU_TEST blargg5official
     WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/bin)
-set_tests_properties(blargg_cpu_test5_official_execute PROPERTIES TIMEOUT 5)
+set_tests_properties(blargg_cpu_test5_official_execute PROPERTIES TIMEOUT 10)
 add_test(
     NAME blargg_cpu_test5_official_match
     COMMAND python ${CMAKE_SOURCE_DIR}/test/logCompare.py
diff --git a/CMakePresets.json b/CMakePresets.json
index 449814b..80b5864 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -20,6 +20,15 @@
         "CMAKE_BUILD_TYPE": "Debug"
       }
     },
+    {
+      "name": "windows-msvc-reldebinfo",
+      "displayName": "MSVC / MSBuild (RelWithDebInfo)",
+      "inherits": "windows-msvc-base",
+      "description": "Windows release-with-debug-info build using MSVC and Visual Studio 2022 generator",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "RelWithDebInfo"
+      }
+    },
     {
       "name": "windows-msvc-release",
       "displayName": "MSVC / MSBuild (Release)",
@@ -75,6 +84,11 @@
       "configuration": "Debug",
       "configurePreset": "windows-msvc-debug"
     },
+    {
+      "name": "MSVC - RelWithDebInfo",
+      "configuration": "RelWithDebInfo",
+      "configurePreset": "windows-msvc-reldebinfo"
+    },
     {
       "name": "MSVC - Release",
       "configuration": "Release",
diff --git a/src/core/ppu.cpp b/src/core/ppu.cpp
index 2f04f8a..a05eca6 100644
--- a/src/core/ppu.cpp
+++ b/src/core/ppu.cpp
@@ -28,6 +28,8 @@ uint8_t PPU::readRegister(addr_t address) {
 
 void PPU::writeRegister(addr_t address, uint8_t data) {
     registers[address] = data;
+    // Write to the PPU open bus
+    registers[0x2] = (registers[0x2] & 0xf0) | (data & 0x0f);
 }
 
 void PPU::start() {
diff --git a/src/cpu/cpu_test.cpp b/src/cpu/cpu_test.cpp
index 7b43fed..0d484b8 100644
--- a/src/cpu/cpu_test.cpp
+++ b/src/cpu/cpu_test.cpp
@@ -100,7 +100,7 @@ void runBlarggCpuTest5Official() {
         std::this_thread::yield();
     }
 
-    for (int i = 0; i < 198000; i++) {
+    for (int i = 0; i < 368380; i++) {
         nes->cpu->cycle();
     }
 
diff --git a/src/cpu/opcodes.cpp b/src/cpu/opcodes.cpp
index 3da9729..20bc30e 100644
--- a/src/cpu/opcodes.cpp
+++ b/src/cpu/opcodes.cpp
@@ -430,7 +430,6 @@ void CPU::runInstruction(addressingMode mode, instruction inst, addr_t addr, uin
             setProcessorStatus(stackPop());
             p.b1 = oldP.b1;
             p.b2 = oldP.b2;
-            p.i = oldP.i;
             }
             break;
         case RLA: {// ROL + AND
diff --git a/src/memory/core_memory.cpp b/src/memory/core_memory.cpp
index e0a7415..4ed22ac 100644
--- a/src/memory/core_memory.cpp
+++ b/src/memory/core_memory.cpp
@@ -44,14 +44,14 @@ addr_t CoreMemory::mapPPU(addr_t address) {
     Reads a byte of data from one of the PPU registers.
 */
 uint8_t CoreMemory::readPPU(addr_t address) {
-    return ppu->readRegister(address);
+    return ppu->readRegister(address & 0xf);
 }
 
 /*
     Writes a byte of data to one of the PPU registers.
 */
 void CoreMemory::writePPU(addr_t address, uint8_t data) {
-    return ppu->writeRegister(address, data);
+    return ppu->writeRegister(address & 0xf, data);
 }
 
 /*
diff --git a/src/memory/mapper001.cpp b/src/memory/mapper001.cpp
index ca740ab..42d82e0 100644
--- a/src/memory/mapper001.cpp
+++ b/src/memory/mapper001.cpp
@@ -34,7 +34,7 @@ void Mapper001::write(addr_t address, uint8_t data) {
             shiftReg = (shiftReg >> 1) | ((data & 1) << 4);
             if (lowBit) {
                 // The low bit was set, so the shift register is full
-                int regId = address & 0x6000;
+                int regId = (address & 0x6000) >> 13;
                 uint8_t* registers[] = {&controlReg, &chrReg0, &chrReg1, &prgReg};
                 *registers[regId] = shiftReg;
                 resetShift();