diff --git a/loaders.cpp b/loaders.cpp
index 01079ba..74fadf8 100644
--- a/loaders.cpp
+++ b/loaders.cpp
@@ -31,7 +31,6 @@ void setBootLoader(bus *const b, const bootloader_t which)
 	int              size   = 0;
 
 	if (which == BL_RK05) {
-		/*
 		start = offset = 01000;
 
 		static uint16_t rk05_code[] = {
@@ -45,8 +44,8 @@ void setBootLoader(bus *const b, const bootloader_t which)
 			0100376,
 			0005007
 		};
-		*/
 
+#if 0
 		// from https://github.com/amakukha/PyPDP11.git
 		offset = 02000;
 		start  = 02002;
@@ -76,6 +75,7 @@ void setBootLoader(bus *const b, const bootloader_t which)
 			0105011,                        // CLRB (R1)
 			0005007                         // CLR PC
 		};
+#endif
 
 		bl = rk05_code;
 
diff --git a/tm-11.cpp b/tm-11.cpp
index df4ac93..b6ea72e 100644
--- a/tm-11.cpp
+++ b/tm-11.cpp
@@ -11,9 +11,6 @@
 
 tm_11::tm_11(const std::string & file, memory *const m) : m(m)
 {
-	offset = 0;
-	memset(registers, 0x00, sizeof registers);
-
 	fh = fopen(file.c_str(), "rb");
 }
 
diff --git a/tm-11.h b/tm-11.h
index e4b49a8..568e9b0 100644
--- a/tm-11.h
+++ b/tm-11.h
@@ -20,11 +20,11 @@ class memory;
 class tm_11
 {
 private:
-	memory *const m;
-	uint16_t registers[6];
-	uint8_t xfer_buffer[65536];
-	int offset;
-	FILE *fh;
+	memory   *const m                  { nullptr };
+	uint16_t        registers[6]       { 0       };
+	uint8_t         xfer_buffer[65536];
+	int             offset             { 0       };
+	FILE           *fh                 { nullptr };
 
 public:
 	tm_11(const std::string & file, memory *const m);