last commit freaks me out a bit. let's try something a little safer looking to fix the SA1 hanging opcodes

libsnes/bsnes/snes/alt/cpu/cpu.cpp

@@ -72,7 +72,9 @@ void CPU::enter() {
       op_irq();
     }
 
-    op_step();
+		if(regs.hang == HangType::Wait) this->op_wai();
+		else if (regs.hang == HangType::Stop) this->op_stp();
+		else op_step();
   }
 }
 

libsnes/bsnes/snes/cpu/core/opcode_misc.cpp

@@ -72,18 +72,22 @@ L rd.h = op_readlong(vectorN + 1);
 }
 
 void CPUcore::op_stp() {
+	regs.hang = HangType::Stop;
   while(regs.wai = true) {
 L   op_io();
 	scheduler.exit(Scheduler::ExitReason::SynchronizeEvent);
   }
+	regs.hang = HangType::None;
 }
 
 void CPUcore::op_wai() {
   regs.wai = true;
+	regs.hang = HangType::Wait;
   while(regs.wai) {
 L   op_io();
 	scheduler.exit(Scheduler::ExitReason::SynchronizeEvent);
   }
+	regs.hang = HangType::None;
   op_io();
 }
 

libsnes/bsnes/snes/cpu/core/registers.hpp

@@ -1,3 +1,5 @@
+enum class HangType: unsigned { None, Wait, Stop };
+
 struct flag_t {
   bool n, v, m, x, d, i, z, c;
 
@@ -73,11 +75,14 @@ struct regs_t {
 
   bool irq;       //IRQ pin (0 = low, 1 = trigger)
   bool wai;       //raised during wai, cleared after interrupt triggered
+
   uint8 mdr;      //memory data register
   uint16 vector;  //interrupt vector address
 
+	HangType hang;
+
   regs_t():
-  a(r[0]), x(r[1]), y(r[2]), z(r[3]), s(r[4]), d(r[5]), db(0), e(false), irq(false), wai(false), mdr(0), vector(0) {
+  a(r[0]), x(r[1]), y(r[2]), z(r[3]), s(r[4]), d(r[5]), db(0), e(false), irq(false), wai(false), mdr(0), vector(0), hang(HangType::None) {
     z = 0;
   }
 };