diff --git a/interpreter/core_methods.c b/interpreter/core_methods.c
index b63a863..448fc77 100644
--- a/interpreter/core_methods.c
+++ b/interpreter/core_methods.c
@@ -20,7 +20,7 @@ char bci_cm_ldi(uint8_t small_arg, machine_state_t state)
 	return machine_state_t_default_afterexec(state, 1);
 }
 
-// @1 -> $0
+// @($1) -> $0
 char bci_cm_ld(uint8_t small_arg, machine_state_t state)
 {
 	BCI_CORE_REGISTER_CHECK(small_arg);
@@ -33,6 +33,9 @@ char bci_cm_ld(uint8_t small_arg, machine_state_t state)
 		return res;
 	}
 
+	BCI_CORE_REGISTER_CHECK(arg);
+	arg = state->data_reg[arg];
+
 	res = machine_state_t_get_mem(state, arg, &arg);
 	if(res)
 	{
@@ -43,7 +46,7 @@ char bci_cm_ld(uint8_t small_arg, machine_state_t state)
 	return machine_state_t_default_afterexec(state, 1);
 }
 
-// $0 -> @1
+// $0 -> @($1)
 char bci_cm_st(uint8_t small_arg, machine_state_t state)
 {
 	BCI_CORE_REGISTER_CHECK(small_arg);
@@ -56,6 +59,9 @@ char bci_cm_st(uint8_t small_arg, machine_state_t state)
 		return res;
 	}
 
+	BCI_CORE_REGISTER_CHECK(arg);
+	arg = state->data_reg[arg];
+
 	res = machine_state_t_set_mem(state, arg, state->data_reg[small_arg]);
 	if(res)
 	{
@@ -250,54 +256,43 @@ char bci_cm_eq(uint8_t small_arg, machine_state_t state)
 	return machine_state_t_default_afterexec(state, 0);
 }
 
-// #1 -> $pc; 0 -> $st_reg
+// $0 -> $pc; 0 -> $st_reg
 char bci_cm_jmp(uint8_t small_arg, machine_state_t state)
 {
-	uint16_t arg;
-	char res = machine_state_t_get_word(state, state->program_counter + 1, &arg);
-
-	if(res)
-	{
-		return res;
-	}
+	BCI_CORE_REGISTER_CHECK(small_arg)
+	uint16_t arg = state->data_reg[arg];
 
+	state->status_reg = 0;
 	state->program_counter = arg;
 	return 0;
 }
 
-// if($st_reg): #1 -> $pc; 0 -> $st_reg
+// if($st_reg): $0 -> $pc; 0 -> $st_reg
 // else: do nothing
 char bci_cm_cjmp(uint8_t small_arg, machine_state_t state)
 {
 	uint16_t arg;
-	char res = machine_state_t_get_word(state, state->program_counter + 1, &arg);
-
-	if(res)
-	{
-		return res;
-	}
+	BCI_CORE_REGISTER_CHECK(small_arg)
+	arg = state->data_reg[arg];
 
 	if(state->status_reg)
 	{
 		state->program_counter = arg;
 		return 0;
 	}
+	state->status_reg = 0;
 
-	return machine_state_t_default_afterexec(state, 1);
+	return machine_state_t_default_afterexec(state, 0);
 }
 // $pc -> @stack
-// #1 -> $pc
+// $0 -> $pc
 char bci_cm_call(uint8_t small_arg, machine_state_t state)
 {
 	uint16_t arg;
-	char res = machine_state_t_get_word(state, state->program_counter + 1, &arg);
+	BCI_CORE_REGISTER_CHECK(small_arg)
+	arg = state->data_reg[arg];
 
-	if(res)
-	{
-		return res;
-	}
-
-	res = bci_stack_t_push(&(state->stack), state->program_counter);
+	char res = bci_stack_t_push(&(state->stack), state->program_counter);
 	if(res)
 	{
 		return res;
@@ -305,17 +300,13 @@ char bci_cm_call(uint8_t small_arg, machine_state_t state)
 	state->program_counter = arg;
 	return 0;
 }
-// if($st_reg): $pc -> @stack; #1 -> $pc; 0 -> $st_reg
+// if($st_reg): $pc -> @stack; $0 -> $pc; 0 -> $st_reg
 // else: do nothing
 char bci_cm_ccall(uint8_t small_arg, machine_state_t state)
 {
 	uint16_t arg;
-	char res = machine_state_t_get_word(state, state->program_counter + 1, &arg);
-
-	if(res)
-	{
-		return res;
-	}
+	BCI_CORE_REGISTER_CHECK(small_arg);
+	arg = state->data_reg[small_arg];
 
 	if(state->status_reg)
 	{
@@ -328,7 +319,8 @@ char bci_cm_ccall(uint8_t small_arg, machine_state_t state)
 		return 0;
 	}
 
-	return machine_state_t_default_afterexec(state, 1);
+	state->status_reg = 0;
+	return machine_state_t_default_afterexec(state, 0);
 }
 // @stack -> $pc
 char bci_cm_ret(uint8_t small_arg, machine_state_t state)
@@ -354,7 +346,21 @@ char bci_cm_cl(uint8_t small_arg, machine_state_t state)
 // 1 -> $su_reg
 char bci_cm_stop(uint8_t small_arg, machine_state_t state)
 {
-	state->shutdown_reg = 0;
+	state->shutdown_reg = 1;
 	return machine_state_t_default_afterexec(state, 0);
 }
 
+// if($st_reg): 0 -> $st_reg
+// else: 1 -> $st_reg
+char bci_cm_not(uint8_t small_arg, machine_state_t state)
+{
+	if(state->status_reg)
+	{
+		state->status_reg = 0;
+	}
+	else
+	{
+		status->status_reg = 1;
+	}
+	return machine_state_t_default_afterexec(state, 0);
+}
diff --git a/interpreter/core_methods.h b/interpreter/core_methods.h
index b7fdd08..e36892a 100644
--- a/interpreter/core_methods.h
+++ b/interpreter/core_methods.h
@@ -32,10 +32,10 @@
 // #1 -> $0
 char bci_cm_ldi(uint8_t small_arg, machine_state_t state);
 
-// @1 -> $0
+// @($1) -> $0
 char bci_cm_ld(uint8_t small_arg, machine_state_t state);
 
-// $0 -> @1
+// $0 -> @($1)
 char bci_cm_st(uint8_t small_arg, machine_state_t state);
 
 
@@ -82,18 +82,22 @@ char bci_cm_le(uint8_t small_arg, machine_state_t state);
 // else: 0 -> $st_reg
 char bci_cm_eq(uint8_t small_arg, machine_state_t state);
 
-// #1 -> $pc
+// if($st_reg): 0 -> $st_reg
+// else: 1 -> $st_reg
+char bci_cm_not(uint8_t small_arg, machine_state_t state);
+
+// $1 -> $pc
 char bci_cm_jmp(uint8_t small_arg, machine_state_t state);
 
-// if($st_reg): #1 -> $pc
+// if($st_reg): $1 -> $pc
 // else: do nothing
 char bci_cm_cjmp(uint8_t small_arg, machine_state_t state);
 
 // $pc -> @stack
-// #1 -> $pc
+// $0 -> $pc
 char bci_cm_call(uint8_t small_arg, machine_state_t state);
 
-// if($st_reg): $pc -> @stack; #1 -> $pc
+// if($st_reg): $pc -> @stack; $0 -> $pc
 // else: do nothing
 char bci_cm_ccall(uint8_t small_arg, machine_state_t state);