diff --git a/basic/scripts/tokens.py b/basic/scripts/tokens.py
index 11100b81..c0a5efaf 100644
--- a/basic/scripts/tokens.py
+++ b/basic/scripts/tokens.py
@@ -97,7 +97,7 @@ def create(self):
 			!!STR 	$ 		(		RAND(	RND(	JOYPAD(	INT(	TIME(	EVENT(	
 			INKEY$(	ASC(	CHR$(	POINT( 	LEN(  	ABS(  	SGN( 	HIT(	SPOINT(
 			MID$(	LEFT$( 	RIGHT$(	TRUE	FALSE	INSTR(	MOUSE(	!!UN6	!!UN7
-			KEY(	PEEK(	DEEK(	ALLOC(	MAX( 	MIN( 	
+			KEY(	PEEK(	DEEK(	ALLOC(	MAX( 	MIN( 	NOT
 			""",48)
 		#
 		#		Structure tokens
diff --git a/basic/sources/arithmetic/unary/base/not.asm b/basic/sources/arithmetic/unary/base/not.asm
new file mode 100644
index 00000000..9be4cdaa
--- /dev/null
+++ b/basic/sources/arithmetic/unary/base/not.asm
@@ -0,0 +1,56 @@
+; ************************************************************************************************
+; ************************************************************************************************
+;
+;		Name:		not.asm
+;		Purpose:	Logical Not
+;		Created:	16th September 2024
+;		Reviewed:   No
+;		Author:		Paul Robson (paul@robsons.org.uk)
+;
+; ************************************************************************************************
+; ************************************************************************************************
+
+; ************************************************************************************************
+;
+;								Return logical NOT of parameter.
+;
+; ************************************************************************************************
+
+		.section code	
+
+EXPUnaryNot: ;; [not]
+		jsr 	EvaluateTerm				; not takes one term because of precedence
+		bit 	XSControl,x	 				; fail if string
+		bmi 	_EXNType
+		bvc 	_EXNIsInteger
+		lda 	#17 						; if real make it integer
+		jsr 	DOMathCommand
+_EXNIsInteger:		
+		lda 	XSNumber3,x 				; check if zero.
+		ora 	XSNumber2,x
+		ora 	XSNumber1,x
+		ora 	XSNumber0,x
+		beq 	_EXNIsZero 					; make it 0 or $FF
+		lda 	#$FF
+_EXNIsZero:		
+		eor 	#$FF 						; now zero will be $FF and anything else $00
+		jmp 	ReturnBoolean
+
+
+_EXNType:
+		.error_type
+
+		.send code
+
+				
+; ************************************************************************************************
+;
+;									Changes and Updates
+;
+; ************************************************************************************************
+;
+;		Date			Notes
+;		==== 			=====
+;
+; ************************************************************************************************
+
diff --git a/basic/test.bsc b/basic/test.bsc
index 9979a63f..3c19faaf 100644
--- a/basic/test.bsc
+++ b/basic/test.bsc
@@ -1 +1 @@
-print "98765";
\ No newline at end of file
+print not 0, not 1, not -1
\ No newline at end of file