diff --git a/cpu/ppc/ppcemu.h b/cpu/ppc/ppcemu.h
index 250913d..f98e77e 100644
--- a/cpu/ppc/ppcemu.h
+++ b/cpu/ppc/ppcemu.h
@@ -325,6 +325,7 @@ extern bool int_pin;
 extern bool dec_exception_pending;
 
 extern bool is_601;        // For PowerPC 601 Emulation
+extern bool include_601;   // For non-PowerPC 601 emulation with 601 extras (matches Mac OS 9 environment which can emulate MPC 601 instructions)
 extern bool is_altivec;    // For Altivec Emulation
 extern bool is_64bit;      // For PowerPC G5 Emulation
 
@@ -417,7 +418,7 @@ void ppc_opcode31();
 void ppc_opcode59();
 void ppc_opcode63();
 
-void initialize_ppc_opcode_tables(bool include_601);
+void initialize_ppc_opcode_tables();
 
 extern double fp_return_double(uint32_t reg);
 extern uint64_t fp_return_uint64(uint32_t reg);
diff --git a/cpu/ppc/ppcexec.cpp b/cpu/ppc/ppcexec.cpp
index 8d8a3c8..84d6059 100644
--- a/cpu/ppc/ppcexec.cpp
+++ b/cpu/ppc/ppcexec.cpp
@@ -56,6 +56,7 @@ using namespace dppc_interpreter;
 MemCtrlBase* mem_ctrl_instance = 0;
 
 bool is_601 = false;
+bool include_601 = false;
 
 bool is_deterministic = false;
 
@@ -637,7 +638,7 @@ do { \
 #define OP63d(subopcode, fn) OPXd(SubOpcode63, subopcode, fn)
 #define OP63dc(subopcode, fn, carry) OPXdc(SubOpcode63, subopcode, fn, carry)
 
-void initialize_ppc_opcode_tables(bool include_601) {
+void initialize_ppc_opcode_tables() {
     std::fill_n(OpcodeGrabber, 64, ppc_illegalop);
     OP(3,  ppc_twi);
     //OP(4,  ppc_opcode4); - Altivec instructions not emulated yet. Uncomment once they're implemented.
@@ -873,7 +874,7 @@ void initialize_ppc_opcode_tables(bool include_601) {
     }
 }
 
-void ppc_cpu_init(MemCtrlBase* mem_ctrl, uint32_t cpu_version, bool include_601, uint64_t tb_freq)
+void ppc_cpu_init(MemCtrlBase* mem_ctrl, uint32_t cpu_version, bool do_include_601, uint64_t tb_freq)
 {
     mem_ctrl_instance = mem_ctrl;
 
@@ -882,8 +883,9 @@ void ppc_cpu_init(MemCtrlBase* mem_ctrl, uint32_t cpu_version, bool include_601,
 
     ppc_state.spr[SPR::PVR] = cpu_version;
     is_601 = (cpu_version >> 16) == 1;
+    include_601 = !is_601 & do_include_601;
 
-    initialize_ppc_opcode_tables(include_601);
+    initialize_ppc_opcode_tables();
 
     // initialize emulator timers
     TimerManager::get_instance()->set_time_now_cb(&get_virt_time_ns);
diff --git a/cpu/ppc/ppcopcodes.cpp b/cpu/ppc/ppcopcodes.cpp
index 8bfe4f9..0e28d51 100644
--- a/cpu/ppc/ppcopcodes.cpp
+++ b/cpu/ppc/ppcopcodes.cpp
@@ -903,7 +903,7 @@ void dppc_interpreter::ppc_mfspr() {
 
     switch (ref_spr) {
     case SPR::MQ:
-        if (!is_601) {
+        if (!(is_601 || include_601)) {
             ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);
         }
         ppc_state.gpr[reg_d] = ppc_state.spr[ref_spr];
@@ -957,10 +957,10 @@ void dppc_interpreter::ppc_mtspr() {
 
     switch (ref_spr) {
     case SPR::MQ:
-        if (!is_601) {
+        if (is_601 || include_601)
+            ppc_state.spr[ref_spr] = val;
+        else
             ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);
-        }
-        ppc_state.spr[ref_spr] = val;
         break;
     case SPR::RTCL_U:
     case SPR::RTCU_U:
diff --git a/cpu/ppc/test/ppctests.cpp b/cpu/ppc/test/ppctests.cpp
index ae16b1b..5e014ea 100644
--- a/cpu/ppc/test/ppctests.cpp
+++ b/cpu/ppc/test/ppctests.cpp
@@ -321,7 +321,8 @@ static void read_test_float_data() {
 }
 
 int main() {
-    initialize_ppc_opcode_tables(true); //kludge
+    is_601 = true;
+    initialize_ppc_opcode_tables(); //kludge
 
     cout << "Running DingusPPC emulator tests..." << endl << endl;