diff --git a/M6502/HarteTest_6502/checker_t.cpp b/M6502/HarteTest_6502/checker_t.cpp
index cf6870b..4acbf62 100644
--- a/M6502/HarteTest_6502/checker_t.cpp
+++ b/M6502/HarteTest_6502/checker_t.cpp
@@ -186,9 +186,13 @@ void checker_t::pushCurrentMessage() {
     os().str("");
 }
 
-void checker_t::disassemble(uint16_t address) {
+std::string checker_t::disassemble(uint16_t address) {
+    return m_disassembler.disassemble(address);
+}
+
+void checker_t::add_disassembly(uint16_t address) {
     try {
-        os() << m_disassembler.disassemble(address);
+        os() << disassemble(address);
     }
     catch (const std::domain_error& error) {
         os() << "Disassembly problem: " << error.what();
@@ -220,7 +224,7 @@ void checker_t::check(test_t test) {
 
     if (invalid() && implemented()) {
 
-        disassemble(pc);
+        add_disassembly(pc);
 
         const auto final = test.final();
         raise("PC", final.pc(), cpu.PC().word);
diff --git a/M6502/HarteTest_6502/checker_t.h b/M6502/HarteTest_6502/checker_t.h
index ce53ad2..f46b5dd 100644
--- a/M6502/HarteTest_6502/checker_t.h
+++ b/M6502/HarteTest_6502/checker_t.h
@@ -56,7 +56,7 @@ private:
     void addActualReadCycle(EightBit::register16_t address, uint8_t value);
     void addActualWriteCycle(EightBit::register16_t address, uint8_t value);
 
-    void disassemble(uint16_t address);
+    void add_disassembly(uint16_t address);
 
     template<class T>
     void dumpCycle(const uint16_t address, const uint8_t value, const T action) {
@@ -91,5 +91,7 @@ public:
 
     void initialise();
 
+    [[nodiscard]] std::string disassemble(uint16_t address);
+
     void check(test_t test);
 };