diff --git a/ESP32/platformio.ini b/ESP32/platformio.ini
index a08cf94..fde7fd8 100644
--- a/ESP32/platformio.ini
+++ b/ESP32/platformio.ini
@@ -8,21 +8,6 @@ lib_ldf_mode = deep+
 lib_deps = 
 src_filter = +<*> -<.git/> -<.svn/> -<example/> -<examples/> -<test/> -<tests/> -<build> -<player.cpp>
 
-[env:serial]
-platform = espressif8266
-board = d1_mini
-framework = arduino
-monitor_speed = 57600
-upload_speed = 1000000
-
-[env:serial_debug]
-platform = espressif8266
-board = d1_mini
-framework = arduino
-monitor_speed = 57600
-upload_speed = 1000000
-build_flags = -DDEBUG
-
 [env:serial32]
 platform = espressif32
 board = wemos_d1_mini32
@@ -32,13 +17,3 @@ upload_speed = 1000000
 lib_deps = 
 build_flags = -std=c++17 -Ofast
 build_unflags = -std=gnu++11 -Os
-
-[env:serial32_debug]
-platform = espressif32
-board = wemos_d1_mini32
-framework = arduino
-monitor_speed = 115200
-upload_speed = 1000000
-lib_deps =
-build_flags = -std=c++17 -DDEBUG
-build_unflags = -std=gnu++11
diff --git a/bus.cpp b/bus.cpp
index 746ce95..8c7e663 100644
--- a/bus.cpp
+++ b/bus.cpp
@@ -18,7 +18,7 @@ bus::bus() : c(nullptr), tm11(nullptr), rk05_(nullptr), rx02_(nullptr), tty_(nul
 #if defined(ESP32)
 	// ESP32 goes in a crash-loop when allocating 128kB
 	// see also https://github.com/espressif/esp-idf/issues/1934
-	int n = 14;
+	int n = 12;
 #else
 	int n = 16;
 #endif
@@ -267,15 +267,12 @@ uint16_t bus::write(const uint16_t a, const bool word_mode, uint16_t value, cons
 {
 	//D(fprintf(stderr, "write bus %o(%d): %o\n", a, word_mode, value);)
 
-	assert(word_mode == 0 || value < 256);
-
 	if (a >= 0160000) {
 		D(fprintf(stderr, "write%c %o to I/O %o\n", word_mode ? 'b' : ' ', value, a);)
 
 		if (word_mode) {
 			if (a == 0177776 || a == 0177777) { // PSW
 				D(fprintf(stderr, "writeb PSW %s\n", a & 1 ? "MSB" : "LSB");)
-				assert(value < 256);
 				uint16_t vtemp = c -> getPSW();
 
 				if (a & 1)
diff --git a/cpu.cpp b/cpu.cpp
index 470904f..ce187c2 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -35,8 +35,6 @@ void cpu::reset()
 
 uint16_t cpu::getRegister(const int nr, const bool prev_mode) const
 {
-	assert(nr >= 0 && nr <= 7);
-
 	if (nr < 6)
 		return regs0_5[getBitPSW(11)][nr];
 
@@ -52,8 +50,6 @@ uint16_t cpu::getRegister(const int nr, const bool prev_mode) const
 
 void cpu::setRegister(const int nr, const bool prev_mode, const uint16_t value)
 {
-	assert(nr >= 0 && nr <= 7);
-
 	if (nr < 6)
 		regs0_5[getBitPSW(11)][nr] = value;
 	else if (nr == 6) {
@@ -69,8 +65,6 @@ void cpu::setRegister(const int nr, const bool prev_mode, const uint16_t value)
 
 void cpu::addRegister(const int nr, const bool prev_mode, const uint16_t value)
 {
-	assert(nr >= 0 && nr <= 7);
-
 	if (nr < 6)
 		regs0_5[getBitPSW(11)][nr] += value;
 	else if (nr == 6) {
@@ -221,7 +215,6 @@ void cpu::putGAM(const uint8_t mode, const int reg, const bool word_mode, const
 			if (word_mode) {
 				uint16_t temp = getRegister(reg, prev_mode);
 				temp &= 0xff00;
-				assert(value < 256);
 				temp |= value;
 				setRegister(reg, prev_mode, temp);
 			}
@@ -601,7 +594,6 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
 			uint16_t oldPC = getPC(); // FIXME gaat dit wel goed voor R7?
 			addRegister(reg, false, -1);
 			if (getRegister(reg, false)) {
-				assert(dst >= 0);
 				uint16_t newPC = oldPC - dst * 2;
 				D(fprintf(stderr, " jump back from %o to %o\n", oldPC, newPC);)
 				setPC(newPC);
diff --git a/cpu.h b/cpu.h
index 518a2ba..d3f93a0 100644
--- a/cpu.h
+++ b/cpu.h
@@ -79,11 +79,11 @@ public:
 	uint16_t getStackLimitRegister() { return stackLimitRegister; }
 	void setStackLimitRegister(const uint16_t v) { stackLimitRegister = v; }
 
-	uint16_t getRegister(const bool user, const int nr) const { assert(nr >= 0 && nr < 6); return regs0_5[user][nr]; }
+	uint16_t getRegister(const bool user, const int nr) const { return regs0_5[user][nr]; }
 	uint16_t getStackPointer(const int which) const { assert(which >= 0 && which < 4); return sp[which]; }
 	uint16_t getPC() const { return pc; }
 
-	void setRegister(const bool user, const int nr, const uint16_t value) { assert(nr >= 0 && nr < 6); regs0_5[user][nr] = value; }
+	void setRegister(const bool user, const int nr, const uint16_t value) { regs0_5[user][nr] = value; }
 	void setStackPointer(const int which, const uint16_t value) { assert(which >= 0 && which < 4); sp[which] = value; }
 	void setPC(const uint16_t value) { pc = value; }