diff --git a/breakpoint_register.cpp b/breakpoint_register.cpp
index 622bf64..328b32e 100644
--- a/breakpoint_register.cpp
+++ b/breakpoint_register.cpp
@@ -16,15 +16,55 @@ breakpoint_register::~breakpoint_register()
 {
 }
 
+std::string breakpoint_register::get_name(hwreg_t reg) const
+{
+	if (reg < 8)
+		return format("R%d", reg);
+
+	switch(reg) {
+		case hr_mmr0:
+			return "mmr0";
+		case hr_mmr1:
+			return "mmr1";
+		case hr_mmr2:
+			return "mmr2";
+		case hr_mmr3:
+			return "mmr3";
+	}
+
+	return "???";
+}
+
 std::optional<std::string> breakpoint_register::is_triggered() const
 {
-	uint16_t v  = c->getRegister(register_nr);  // TODO run-mode
+	uint16_t v  = 0;
+
+	if (register_nr < 8)
+		v = c->getRegister(register_nr);  // TODO run-mode
+	else {
+		hwreg_t reg = hwreg_t(register_nr);
+
+		switch(reg) {
+			case hr_mmr0:
+				v = b->getMMR0();
+				break;
+			case hr_mmr1:
+				v = b->getMMR1();
+				break;
+			case hr_mmr2:
+				v = b->getMMR2();
+				break;
+			case hr_mmr3:
+				v = b->getMMR3();
+				break;
+		}
+	}
 
 	auto     it = values.find(v);
 	if (it == values.end())
 		return { };
 
-	return format("R%d=%06o", register_nr, v);
+	return get_name(hwreg_t(register_nr)) + format("%06o", v);
 }
 
 std::pair<breakpoint_register *, std::optional<std::string> > breakpoint_register::parse(bus *const b, const std::string & in)
@@ -56,6 +96,11 @@ std::pair<breakpoint_register *, std::optional<std::string> > breakpoint_registe
 	else if (key == "PC" || key == "pc") {
 		return { new breakpoint_register(b, 7, values), { } };
 	}
+	else if (key.substr(0, 3) == "MMR" or key.substr(0, 3) == "mmr") {
+		int which = key[3] - '0';
+
+		return { new breakpoint_register(b, hr_mmr0 + which, values), { } };
+	}
 
 	return { nullptr, { } };
 }
@@ -66,7 +111,7 @@ std::string breakpoint_register::emit() const
 
 	for(auto & v: values) {
 		if (out.empty())
-			out = format("R%d", register_nr) + "=";
+			out = get_name(hwreg_t(register_nr)) + "=";
 		else
 			out += ",";
 
diff --git a/breakpoint_register.h b/breakpoint_register.h
index 784cfbb..45f118b 100644
--- a/breakpoint_register.h
+++ b/breakpoint_register.h
@@ -13,6 +13,10 @@ private:
 	int                register_nr { -1      };
 	std::set<uint16_t> values;
 
+	enum hwreg_t { hr_mmr0 = 100, hr_mmr1, hr_mmr2, hr_mmr3 };
+
+	std::string get_name(hwreg_t reg) const;
+
 public:
 	breakpoint_register(bus *const b, const int register_nr, const std::set<uint16_t> & values);
 	virtual ~breakpoint_register();
diff --git a/debugger.cpp b/debugger.cpp
index ff921b3..d1566b0 100644
--- a/debugger.cpp
+++ b/debugger.cpp
@@ -1026,7 +1026,7 @@ void debugger(console *const cnsl, bus *const b, std::atomic_uint32_t *const sto
 				cnsl->put_string_lf("sbp/cbp/lbp   - set/clear/list breakpoint(s)");
 				cnsl->put_string_lf("                e.g.: (pc=0123 and memwv[04000]=0200,0300 and (r4=07,05 or r5=0456))");
 				cnsl->put_string_lf("                values seperated by ',', char after mem is w/b (word/byte), then");
-				cnsl->put_string_lf("                follows v/p (virtual/physical), all octal values");
+				cnsl->put_string_lf("                follows v/p (virtual/physical), all octal values, mmr0-3 are registers");
 				cnsl->put_string_lf("trace/t       - toggle tracing");
 				cnsl->put_string_lf("turbo         - toggle turbo mode (cannot be interrupted)");
 				cnsl->put_string_lf("strace        - start tracing from address - invoke without address to disable");