Most of the keywords used by Commodore BASIC are "compressed" into (typically) a 1-byte code known as a token (rarely a 2-byte code).  This has several advantages: longer programs can be stored in memory, scanning through a program line is faster, program files are smaller, loading/saving the program is faster, and executing the program is faster.  Although Commodore BASIC is said to be an interpreter, the conversion into tokens is essentially a form of compilation.  So when the program runs, BASIC does not need to parse the text of "PRINT" for example, it instead just does a quick look-up based on the token.  (Off-topic, the main reason it is called an interpreter is because the variables and line numbers must be searched when the program runs; a compiler would hard-code such references.)

 

Below is a table listing all keywords ordered by their token value (if it has one).  (Here you can find a table ordered by name.) This table also includes the version number(s) to which it applies, and a classification.

Token (hex)	Keyword	Version(s)	Classification
44 53**	DS	3.5+	Reserved variable (read only)
44 53 24**	DS$	3.5+	Reserved variable (read only)
45 4C**	EL	3.5+	Reserved variable (read only)
45 52**	ER	3.5+	Reserved variable (read only)
53 54**	ST	1.0+	Reserved variable (read only)
54 49**	TI	1.0+	Reserved variable
54 49 24**	TI$	1.0+	Reserved variable
80	END	1.0+	Command* and Statement
81	FOR	1.0+	Command and Statement
82	NEXT	1.0+	Command, Preposition and Statement
83	DATA	1.0+	Command* and Statement
84	INPUT#	1.0+	Statement
85	INPUT	1.0+	Statement
86	DIM	1.0+	Command and Statement
87	READ	1.0+	Command and Statement
88	LET	1.0+	Command and Statement
89	GOTO	1.0+	Command and Statement
8A	RUN	1.0+	Command and Statement
8B	IF	1.0+	Command and Statement
8C	RESTORE	1.0+	Command and Statement
8D	GOSUB	1.0+	Command and Statement
8E	RETURN	1.0+	Statement
8F	REM	1.0+	Command and Statement
90	STOP	1.0+	Command* and Statement
91	ON	1.0+	Preposition
92	WAIT	1.0+	Command and Statement
93	LOAD	1.0+	Command* and Statement
94	SAVE	1.0+	Command and Statement
95	VERIFY	1.0+	Command* and Statement
96	DEF	1.0+	Statement
97	POKE	1.0+	Command and Statement
98	PRINT#	1.0+	Command and Statement
99	PRINT	1.0+	Command and Statement
9A	CONT	1.0+	Command* and Statement
9B	LIST	1.0+	Command and Statement*
9C	CLR	1.0+	Command and Statement
9D	CMD	1.0+	Command and Statement
9E	SYS	1.0+	Command and Statement
9F	OPEN	1.0+	Command and Statement
A0	CLOSE	1.0+	Command and Statement
A1	GET	1.0+	Statement
A1 23	GET#	1.0+	Statement
A1 F9	GETKEY	3.5, 7.0	Statement
A2	NEW	1.0+	Command and Statement*
A3	TAB(	1.0+	Preposition
A4	TO	1.0+	Preposition
A5	FN	1.0+	Function/Preposition
A6	SPC(	1.0+	Preposition
A7	THEN	1.0+	Preposition
A8	NOT	1.0+	Operator (5)
A9	STEP	1.0+	Preposition
AA	+	1.0+	Operator (3)
AB	-	1.0+	Operator (3)
AC	*	1.0+	Operator (2)
AD	/	1.0+	Operator (2)
AE	^	1.0+	Operator (1)
AF	AND	1.0+	Operator (6)
B0	OR	1.0+	Operator (7)
B1	>	1.0+	Operator (4)
B2	=	1.0+	Operator (4)
B3	<	1.0+	Operator (4)
B4	SGN	1.0+	Function
B5	INT	1.0+	Function
B6	ABS	1.0+	Function
B7	USR	1.0+	Function
B8	FRE	1.0+	Function
B9	POS	1.0+	Function
BA	SQR	1.0+	Function
BB	RND	1.0+	Function
BC	LOG	1.0+	Function
BD	EXP	1.0+	Function
BE	COS	1.0+	Function
BF	SIN	1.0+	Function
C0	TAN	1.0+	Function
C1	ATN	1.0+	Function
C2	PEEK	1.0+	Function
C3	LEN	1.0+	Function
C4	STR$	1.0+	Function
C5	VAL	1.0+	Function
C6	ASC	1.0+	Function
C7	CHR$	1.0+	Function
C8	LEFT$	1.0+	Function
C9	RIGHT$	1.0+	Function
CA	MID$	1.0+	Function
CB	GO	2.0+	Command and Statement
CC	RGR	3.5,7.0	Function
CC	CONCAT	4.x	Command and Statement
CD	RCLR	3.5,7.0	Function
CD	DOPEN	4.x	Command and Statement
CE	RLUM	3.5	Function
CE	DCLOSE	4.x	Command and Statement
CE 02	POT	7.0	Function
CE 03	BUMP	7.0	Function
CE 04	PEN	7.0	Function
CE 05	RSPPOS	7.0	Function
CE 06	RSPRITE	7.0	Function
CE 07	RSPCOLOR	7.0	Function
CE 08	XOR	7.0	Function
CE 09	RWINDOW	7.0	Function
CE 0A	POINTER	7.0	Function
CF	JOY	3.5,7.0	Function
CF	RECORD	4.x	Command and Statement
D0	RDOT	3.5,7.0	Function
D0	HEADER	4.x	Command and Statement
D1	DEC	3.5,7.0	Function
D1	COLLECT	4.x	Command and Statement
D2	HEX$	3.5,7.0	Function
D2	BACKUP	4.x	Command and Statement
D3	ERR$	3.5,7.0	Function
D3	COPY	4.x	Command and Statement
D4	INSTR	3.5,7.0	Function
D4	APPEND	4.x	Command and Statement
D5	ELSE	3.5,7.0	Command*, Preposition, and Statement*
D5	DSAVE	4.x	Command and Statement
D6	RESUME	3.5,7.0	Statement
D6	DLOAD	4.x	Command* and Statement
D7	TRAP	3.5,7.0	Statement
D7	CATALOG	4.x	Command and Statement
D8	TRON	3.5,7.0	Command and Statement
D8	RENAME	4.x	Command and Statement
D9	TROFF	3.5,7.0	Command and Statement
D9	SCRATCH	4.x	Command and Statement
DA	SOUND	3.5,7.0	Command and Statement
DA	DIRECTORY	4.x	Command and Statement
DB	VOL	3.5,7.0	Command and Statement
DB	DCLEAR	4.7	Command and Statement
DC	AUTO	3.5,7.0	Command and Statement
DC	BANK	4.7	Command and Statement
DD	PUDEF	3.5,7.0	Command and Statement
DD	BLOAD	4.7	Command and Statement
DE	GRAPHIC	3.5,7.0	Command and Statement
DE	BSAVE	4.7	Command and Statement
DF	PAINT	3.5,7.0	Command and Statement
DF	KEY	4.7	Command and Statement
E0	CHAR	3.5,7.0	Command and Statement
E0	DELETE	4.7	Command
E1	BOX	3.5,7.0	Command and Statement
E1	ELSE	4.7	Preposition
E2	CIRCLE	3.5,7.0	Command and Statement
E2	TRAP	4.7	Statement
E3	GSHAPE	3.5,7.0	Command and Statement
E3	RESUME	4.7	Statement
E4	SSHAPE	3.5,7.0	Command and Statement
E4	DISPOSE	4.7	Command and Statement
E5	DRAW	3.5,7.0	Command and Statement
E5	PUDEF	4.7	Command and Statement
E6	LOCATE	3.5,7.0	Command and Statement
E6	USING	4.7	Preposition
E7	COLOR	3.5,7.0	Command and Statement
E7	ERR$	4.7	Function
E8	SCNCLR	3.5,7.0	Command and Statement
E8	INSTR	4.7	Function
E9	SCALE	3.5,7.0	Command and Statement
EA	HELP	3.5,7.0	Command and Statement*
EB	DO	3.5,7.0	Command and Statement
EC	LOOP	3.5,7.0	Command and Statement
ED	EXIT	3.5,7.0	Command and Statement
EE	DIRECTORY	3.5,7.0	Command and Statement
EF	DSAVE	3.5,7.0	Command and Statement
F0	DLOAD	3.5,7.0	Command and Statement*
F1	HEADER	3.5,7.0	Command and Statement
F2	SCRATCH	3.5,7.0	Command and Statement
F3	COLLECT	3.5,7.0	Command and Statement
F4	COPY	3.5,7.0	Command and Statement
F5	RENAME	3.5,7.0	Command and Statement
F6	BACKUP	3.5,7.0	Command and Statement
F7	DELETE	3.5,7.0	Command and Statement
F8	RENUMBER	3.5,7.0	Command
F9	KEY	3.5,7.0	Command, Preposition, and Statement
FA	MONITOR	3.5,7.0	Command and Statement*
FB	USING	3.5,7.0	Preposition
FC	UNTIL	3.5,7.0	Preposition
FD	WHILE	3.5,7.0	Preposition
FE 02	BANK	7.0	Command and Statement
FE 03	FILTER	7.0	Command and Statement
FE 04	PLAY	7.0	Command and Statement
FE 05	TEMPO	7.0	Command and Statement
FE 06	MOVSPR	7.0	Command and Statement
FE 07	SPRITE	7.0	Command and Statement
FE 08	SPRCOLOR	7.0	Command and Statement
FE 09	RREG	7.0	Command and Statement
FE 0A	ENVELOPE	7.0	Command and Statement
FE 0B	SLEEP	7.0	Command and Statement
FE 0C	CATALOG	7.0	Command and Statement
FE 0D	DOPEN	7.0	Command and Statement
FE 0E	APPEND	7.0	Command and Statement
FE 0F	DCLOSE	7.0	Command and Statement
FE 10	BSAVE	7.0	Command and Statement
FE 11	BLOAD	7.0	Command and Statement
FE 12	RECORD	7.0	Command and Statement
FE 13	CONCAT	7.0	Command and Statement
FE 14	DVERIFY	7.0	Command and Statement
FE 15	DCLEAR	7.0	Command and Statement
FE 16	SPRSAV	7.0	Command and Statement
FE 17	COLLISION	7.0	Command and Statement
FE 18	BEGIN	7.0	Preposition
FE 19	BEND	7.0	Command* and Statement*
FE 1A	WINDOW	7.0	Command and Statement
FE 1B	BOOT	7.0	Command and Statement
FE 1C	WIDTH	7.0	Command and Statement
FE 1D	SPRDEF	7.0	Command and Statement
FE 1E	QUIT	7.0	Command and Statement
FE 1F	STASH	7.0	Command and Statement
FE 21	FETCH	7.0	Command and Statement
FE 23	SWAP	7.0	Command and Statement
FE 24	OFF	7.0	Preposition
FE 25	FAST	7.0	Command and Statement
FE 26	SLOW	7.0	Command and Statement
FF	π (pi)	1.0+	Reserved variable

Wow, you read all that?! A few notes about the the table. The "tokens" marked ** are really just the character code(s) for the letters that make up the name (you should see this only applies to reserved variable names).  Most keywords can be used as commands (in direct mode) or as statements (in a running program), although a few can only be used one way but not the other.  However, there are several that in theory could be used as either commands or statements, but certain uses are uncommon in practice due to no effect or undesirable side-effects; these are marked with an asterisk (*).

 

For example, LIST is classified as "Command or Statement*" (note the * following Statement).  This is because you wouldn't normally include LIST as a statement within a program.  The reason is, when it is used inside a program, it has the (usually undesired) side-effect of ending the program.  Another example would be END; classified as "Command* or Statement" (note * by Command) because it is normally only used as a statement within a program.  Commanding the computer to END in direct mode does not cause any error, but it doesn't do anything useful because (by definition) no program is running in direct mode.

 

Expressions in BASIC are evaluated using a fixed precedence (order of operations) for the different math operators.  For example, LET Y= 1+2*X would evaluate 2 times X before adding 1.  This is because multiplication (* operator) has higher precedence than addition (+ operator).  Each operator listed has its precedence level shown in parentheses.  For example, addition (+) is listed as "Operator (3)" which means it has 3rd (third) highest priority.  Precedence levels range from 1 (highest) to 7 (lowest).  Note that any sub-expressions enclosed in parentheses will be evaluated with an even higher precendence.  One obscure/interesting thing to note is that although most operators are 1-character symbols (thus only need 1 byte to encode), their token values are radically different from their ASCII/PETSCII codes.

Thanks to Tiaan Geldenhuys for correction of token values of less (<) and more (>)!!