diff --git a/bus.cpp b/bus.cpp
index 9c1883c..471bf6e 100644
--- a/bus.cpp
+++ b/bus.cpp
@@ -738,8 +738,7 @@ void bus::addToMMR1(const int8_t delta, const uint8_t reg)
 	assert(reg >= 0 && reg <= 7);
 	assert(delta >= -2 && delta <= 2);
 
-	if (getMMR0() & 0160000)  // MMR1 etc are locked
-		return;
+	assert((getMMR0() & 0160000) == 0);  // MMR1 should not be locked
 
 #if defined(ESP32)
 //	if (MMR1 > 255)
diff --git a/debugger.cpp b/debugger.cpp
index 3c137bd..b4e0b09 100644
--- a/debugger.cpp
+++ b/debugger.cpp
@@ -574,7 +574,7 @@ void dump_par_pdr(console *const cnsl, bus *const b, const uint16_t pdrs, const
 	else
 		cnsl->put_string_lf(format("%s DISABLED", name.c_str()));
 
-	cnsl->put_string_lf("   PAR             PDR LEN");
+	cnsl->put_string_lf("   PAR             PDR    LEN");
 
 	for(int i=0; i<8; i++) {
 		if (selection.has_value() && i != selection.value())
diff --git a/rl02.cpp b/rl02.cpp
index f4cfdee..6679195 100644
--- a/rl02.cpp
+++ b/rl02.cpp
@@ -41,7 +41,7 @@ rl02::~rl02()
 
 void rl02::reset()
 {
-	memset(registers, 0x00, sizeof registers);
+	memset(registers,   0x00, sizeof registers);
 	memset(xfer_buffer, 0x00, sizeof xfer_buffer);
 }
 
@@ -91,10 +91,9 @@ void rl02::writeByte(const uint16_t addr, const uint8_t v)
 
 uint32_t rl02::calcOffset(const uint16_t da)
 {
-	int           sector            = da & 63;
-	int           track             = (da >> 6) & 1023;
-
-	uint32_t      offset            = (sectors_per_track * track + sector) * bytes_per_sector;
+	int       sector = da & 63;
+	int       track  = (da >> 6) & 1023;
+	uint32_t  offset = (sectors_per_track * track + sector) * bytes_per_sector;
 
 	return offset;
 }
@@ -123,8 +122,6 @@ void rl02::writeWord(const uint16_t addr, uint16_t v)
 		else if (command == 6 || command == 7) {  // read data / read data without header check
 			*disk_read_acitivity = true;
 
-			bool     proceed          = true;
-
 			uint32_t temp_disk_offset = disk_offset;
 
 			uint32_t memory_address   = registers[(RL02_BAR - RL02_BASE) / 2];
@@ -133,8 +130,8 @@ void rl02::writeWord(const uint16_t addr, uint16_t v)
 
 			DOLOG(debug, false, "RL02 read %d bytes (dec) from %d (dec) to %06o (oct)", count, disk_offset, memory_address);
 
-			uint32_t p    = memory_address;
-			while(proceed && count > 0) {
+			uint32_t p = memory_address;
+			while(count > 0) {
 				uint32_t cur = std::min(uint32_t(sizeof xfer_buffer), count);
 
 				if (!fhs.at(device)->read(temp_disk_offset, cur, xfer_buffer)) {