The Structure of I-Code

The 'I' in I-Code stands for Intermediate. Intermediate code is code that is a step between interpreted source statements and fully compiled machine code. Typically, intermediate code uses tokens to represent the instructions to be executed. Basic09 I-Code goes a step further by re-arranging the source code instructions in post-fix notation (also known as Reverse Polish Notation) order.

The tokens used by Basic09 are a single byte ranging from $00 to $FF. The table below defines the tokens.

I-Code Token List

Token	Name	Used In	Description
00	GLOBAL	Reserved	Global Variable
01	PARAM	Editor
01	READ	I-Code	File Mode
02	TYPE	Editor
02	WRITE	I-Code	File Mode
03	DIM	Editor
03	UPDATE	I-Code	File Mode
04	DATA	I-Code/Editor
04	EXEC	I-Code	File Mode
05	STOP	I-Code/Editor
05	READ+EXEC	I-Code	File Mode
06	BYE	I-Code/Editor
06	WRITE+EXEC	I-Code	File Mode
07	TRON	I-Code/Editor
07	UPDATE+EXEC	I-Code	File Mode
08	TROFF	I-Code/Editor
09	PAUSE	I-Code/Editor
0A	DEG	I-Code/Editor
0B	RAD	I-Code/Editor
0C	RETURN	I-Code/Editor
0D	LET	I-Code/Editor
0E	<cva>	I-Code/Editor	Complex Variable Assignment
0F	POKE	I-Code/Editor
10	IF	I-Code/Editor
11	ELSE	I-Code/Editor
12	ENDIF	I-Code/Editor
13	FOR	I-Code/Editor
14	NEXT	I-Code/Editor
15	WHILE	I-Code/Editor
16	ENDWHILE	I-Code/Editor
17	REPEAT	I-Code/Editor
18	UNTIL	I-Code/Editor
19	LOOP	I-Code/Editor
1A	ENDLOOP	I-Code/Editor
1B	EXITIF	I-Code/Editor
1C	ENDEXIT	I-Code/Editor
1D	ON	I-Code/Editor
1E	ERROR	I-Code/Editor
1F	GOTO	Editor	Unbound
20	GOTO	I-Code/Editor	Bound
21	GOSUB	Editor	Unbound
22	GOSUB	I-Code/Editor	Bound
23	RUN	I-Code/Editor
24	KILL	I-Code/Editor
25	INPUT	I-Code/Editor
26	PRINT	I-Code/Editor	? Becomes PRINT in the Editor
27	CHD	I-Code/Editor
28	CHX	I-Code/Editor
29	CREATE	I-Code/Editor
2A	OPEN	I-Code/Editor
2B	SEEK	I-Code/Editor
2C	READ	I-Code/Editor
2D	WRITE	I-Code/Editor
2E	GET	I-Code/Editor
2F	PUT	I-Code/Editor
30	CLOSE	I-Code/Editor
31	RESTORE	I-Code/Editor
32	DELETE	I-Code/Editor
33	CHAIN	I-Code/Editor
34	SHELL	I-Code/Editor
35	BASE 0	I-Code/Editor
36	BASE 1	I-Code/Editor
37	REM	Editor	! Becomes REM in the Editor
38	(*	Editor
39	END	I-Code/Editor
3A	<ulrf>	I-Code/Editor	Unbound Line Reference
3B	<blrf>	I-Code/Editor	Bound Line Reference
3C	<dex>	I-Code/Editor	Direct Execution
3D	PROCEDURE	Editor	Procedure start
3D	<erl>	Editor/Debug	Error Line
3E	\	I-Code/Editor	End-of-Instruction, Continue Line
3F	<eol>	I-Code/Editor	End-of-Instruction and Line
40	BYTE	Editor
40	fbyte	I-Code/Editor	VDT Entry, Field Byte Variable
41	INTEGER	Editor
41	finteger	I-Code/Editor	VDT Entry, Field Integer Variable
42	REAL	Editor
42	freal	I-Code/Editor	VDT Entry, Field Real Variable
43	BOOLEAN	Editor
43	fboolean	I-Code/Editor	VDT Entry, Field Boolean Variable
44	STRING	Editor
44	fstring	I-Code/Editor	VDT Entry, Field String Variable
45	THEN	I-Code/Editor
45	frecord	I-Code/Editor	VDT Entry, Field Record Variable
46	TO	I-Code/Editor
47	STEP	I-Code/Editor
48	DO	I-Code/Editor
48	fvectorb	I-Code/Editor	VDT Entry, Field 1 Dimensional Byte Array
49	USING	I-Code/Editor
49	fvectori	I-Code/Editor	VDT Entry, Field 1 Dimensional Integer Array
4A	:	I-Code/Editor	File Mode Operator
4A	fvectorr	I-Code/Editor	VDT Entry, Field 1 Dimensional Real Array
4B	,	I-Code/Editor	Comma Separator
4B	fvectorl	I-Code/Editor	VDT Entry, Field 1 Dimensional Boolean Array
4C	:	I-Code/Editor	Colon
4C	fvectors	I-Code/Editor	VDT Entry, Field 1 Dimensional String Array
4D	(	I-Code/Editor	Left Parenthesis
4D	fvectoru	I-Code/Editor	VDT Entry, Field 1 Dimensional Record Array
4E	)	I-Code/Editor	Right Parenthesis
4F	[	I-Code/Editor	Left Bracket
50	]	I-Code/Editor	Right Bracket
50	ftableb	I-Code/Editor	VDT Entry, Field 2 Dimensional Byte Array
51	;	I-Code/Editor	Semi-colon
51	ftablei	I-Code/Editor	VDT Entry, Field 2 Dimensional Integer Array
52	:=	I-Code/Editor	Assignment Operator
52	ftabler	I-Code/Editor	VDT Entry, Field 2 Dimensional Real Array
53	=	I-Code/Editor	Assignment Operator
53	ftablel	I-Code/Editor	VDT Entry, Field 2 Dimensional Boolean Array
54	#	I-Code/Editor	Channel (Path) Number Operator
54	ftables	I-Code/Editor	VDT Entry, Field 2 Dimensional String Array
55	<ivgt>	I-Code/Editor	Invisible GOTO (used with IF)
55	ftableu	I-Code/Editor	VDT Entry, Field 2 Dimensional Record Array
56		Unused
57		Unused
58	fmatrixb	I-Code/Editor	VDT Entry, Field 3 Dimensional Byte Array
59	fmatrixi	I-Code/Editor	VDT Entry, Field 3 Dimensional Integer Array
5A	fmatrixr	I-Code/Editor	VDT Entry, Field 3 Dimensional Real Array
5B	fmatrixl	I-Code/Editor	VDT Entry, Field 3 Dimensional Boolean Array
5C	fmatrixs	I-Code/Editor	VDT Entry, Field 3 Dimensional String Array
5D	fmatrixu	I-Code/Editor	VDT Entry, Field 3 Dimensional Record Array
5E		Unused
5F		Unused
60	byte	I-Code/Editor	VDT entry, Byte Variable
61	integer	I-Code/Editor	VDT entry, Integer Variable
62	real	I-Code/Editor	VDT entry, Real Variable
63	boolean	I-Code/Editor	VDT entry, Boolean Variable
64	string	I-Code/Editor	VDT entry, String Variable
65	record	I-Code/Editor	VDT entry, Record Variable
66		Unused
67		Unused
68	vectorb	I-Code/Editor	VDT Entry, 1 Dimensional Byte Array
69	vectori	I-Code/Editor	VDT Entry, 1 Dimensional Integer Array
6A	vectorr	I-Code/Editor	VDT Entry, 1 Dimensional Real Array
6B	vectorl	I-Code/Editor	VDT Entry, 1 Dimensional Boolean Array
6C	vectors	I-Code/Editor	VDT Entry, 1 Dimensional String Array
6D	vectoru	I-Code/Editor	VDT Entry, 1 Dimensional Record Array
6E		Unused
6F		Unused
70	tableb	I-Code/Editor	VDT Entry, 2 Dimensional Byte Array
71	tablei	I-Code/Editor	VDT Entry, 2 Dimensional Integer Array
72	tabler	I-Code/Editor	VDT Entry, 2 Dimensional Real Array
73	tablel	I-Code/Editor	VDT Entry, 2 Dimensional Boolean Array
74	tables	I-Code/Editor	VDT Entry, 2 Dimensional String Array
75	tableu	I-Code/Editor	VDT Entry, 2 Dimensional Record Array
76		Unused
77		Unused
78	matrixb	I-Code/Editor	VDT Entry, 3 Dimensional Byte Array
79	matrixi	I-Code/Editor	VDT Entry, 3 Dimensional Integer Array
7A	matrixr	I-Code/Editor	VDT Entry, 3 Dimensional Real Array
7B	matrixl	I-Code/Editor	VDT Entry, 3 Dimensional Boolean Array
7C	matrixs	I-Code/Editor	VDT Entry, 3 Dimensional String Array
7D	matrixu	I-Code/Editor	VDT Entry, 3 Dimensional Record Array
7E		Unused
7F		Unused
80	byte	I-Code/Editor	Instruction, Simple Byte Variable
80	pbyte	I-Code/Editor	VDT Entry, Parameter Byte Variable
80	DIR	I-Code	File Mode
81	integer	I-Code/Editor	Instruction, Simple Integer Variable
81	pinteger	I-Code/Editor	VDT Entry, Parameter Integer Variable
81	READ+DIR	I-Code	File Mode
82	real	I-Code/Editor	Instruction, Simple Real Variable
82	preal	I-Code/Editor	VDT Entry, Parameter Real Variable
82	WRITE+DIR	I-Code	File Mode
83	boolean	I-Code/Editor	Instruction, Simple Boolean Variable
83	pboolean	I-Code/Editor	VDT Entry, Parameter Boolean Variable
83	UPDATE+DIR	I-Code	File Mode
84	string	I-Code/Editor	Instruction, Simple String Variable
84	pstring	I-Code/Editor	VDT Entry, Parameter String Variable
84	EXEC+DIR	I-Code	File Mode
85	record/p	I-Code/Editor	Instruction, Record, Parameter (Simple/Record) Variable
85	vector/p	I-Code/Editor	Instruction, 1 Dimensional Array, Parameter 1 Dimensional Array Variable
85	table/p	I-Code/Editor	Instruction, 2 Dimensional Array, Parameter 2 Dimensional Array Variable
85	matrix/p	I-Code/Editor	Instruction, 3 Dimensional Array, Parameter 3 Dimensional Array Variable
85	precord	I-Code/Editor	VDT Entry, Parameter Record Variable
85	READ+EXEC+DIR	I-Code	File Mode
86	vector/p	I-Code/Editor	Instruction, 1 Dimensional Array
86	WRITE+EXEC+DIR	I-Code	File Mode
87	table/p	I-Code/Editor	Instruction, 2 Dimensional Array
87	UPDATE+EXEC+DIR	I-Code	File Mode
88	matrix/p	I-Code/Editor	Instruction, 3 Dimensional Array
88	pvectorb	I-Code/Editor	VDT Entry, Parameter 1 Dimensional Byte Array
89	varm	I-Code/Editor	Instruction, Simple/Record Variable Mirror
89	pvectori	I-Code/Editor	VDT Entry, Parameter 1 Dimensional Integer Array
8A	fvectorm	I-Code/Editor	VDT Entry, Field 1 Dimensional Array Mirror
8A	pvectorr	I-Code/Editor	VDT Entry, Parameter 1 Dimensional Real Array
8B	ftablem	I-Code/Editor	VDT Entry, Field 2 Dimensional Array Mirror
8B	pvectorl	I-Code/Editor	VDT Entry, Parameter 1 Dimensional Boolean Array
8C	fmatrixm	I-Code/Editor	VDT Entry, Field 3 Dimensional Array Mirror
8C	pvectors	I-Code/Editor	VDT Entry, Parameter 1 Dimensional String Array
8D	<blit>	I-Code/Editor	BYTE Constant (Literal)
8D	pvectoru	I-Code/Editor	VDT Entry, Parameter 1 Dimensional Record Array
8E	<ilit>	I-Code/Editor	INTEGER Constant (Literal)
8F	<rlit>	I-Code/Editor	REAL Constant (Literal)
90	"	I-Code/Editor	STRING Constant - Beginning (Literal)
90	ptableb	I-Code/Editor	VDT Entry, Parameter 2 Dimensional Byte Array
91	$	I-Code/Editor	Hexadecimal Constant (Literal)
91	ptablei	I-Code/Editor	VDT Entry, Parameter 2 Dimensional Integer Array
92	ADDR()	I-Code/Editor
92	ptabler	I-Code/Editor	VDT Entry, Parameter 2 Dimensional Real Array
93	<addr>	I-Code/Editor	Second Byte of ADDR()
93	ptablel	I-Code/Editor	VDT Entry, Parameter 2 Dimensional Boolean Array
94	SIZE()	I-Code/Editor
94	ptables	I-Code/Editor	VDT Entry, Parameter 2 Dimensional String Array
95	<size>	I-Code/Editor	Second Byte of SIZE()
95	ptableu	I-Code/Editor	VDT Entry, Parameter 2 Dimensional Record Array
96	POS()	I-Code/Editor
97	ERR()	I-Code/Editor
98	MOD()	I-Code/Editor	Byte/Integer
98	pmatrixb	I-Code/Editor	VDT Entry, Parameter 3 Dimensional Byte Array
99	MOD()	I-Code/Editor	Real
99	pmatrixi	I-Code/Editor	VDT Entry, Parameter 3 Dimensional Integer Array
9A	RND()	I-Code/Editor
9A	pmatrixr	I-Code/Editor	VDT Entry, Parameter 3 Dimensional Real Array
9B	PI	I-Code/Editor
9B	pmatrixl	I-Code/Editor	VDT Entry, Parameter 3 Dimensional Boolean Array
9C	SUBSTR()	I-Code/Editor
9C	pmatrixs	I-Code/Editor	VDT Entry, Parameter 3 Dimensional String Array
9D	SGN()	I-Code/Editor
9D	pmatrixu	I-Code/Editor	VDT Entry, Parameter 3 Dimensional Record Array
9E	SGN()	I-Code/Editor
9F	SIN()	I-Code/Editor
A0	COS()	I-Code/Editor
A0	<subr>	I-Code/Editor	Called Subroutine Name
A1	TAN()	I-Code/Editor
A2	ASN()	I-Code/Editor
A3	ACS()	I-Code/Editor
A4	ATN()	I-Code/Editor
A5	EXP()	I-Code/Editor
A6	ABS()	I-Code/Editor
A7	ABS()	I-Code/Editor
A8	LOG()	I-Code/Editor
A9	LOG10()	I-Code/Editor
AA	SQRT()	I-Code/Editor
AB	SQR()	I-Code/Editor	Becomes SQRT() in the Code
INT() |I-Code/Editor |Byte/Integer
INT() |I-Code/Editor |Real
FIX() |I-Code/Editor |Byte/Integer
FIX() |I-Code/Editor |Real
FLOAT() |I-Code/Editor |Byte/Integer
FLOAT() |I-Code/Editor |Real
SQ() |I-Code/Editor |Byte/Integer
SQ() |I-Code/Editor |Real
PEEK() |I-Code/Editor |
LNOT() |I-Code/Editor |Logical NOT
VAL() |I-Code/Editor |
LEN() |I-Code/Editor |
ASC() |I-Code/Editor |
LAND() |I-Code/Editor |Logical AND
LOR() |I-Code/Editor |Logical OR
LXOR() |I-Code/Editor |Logical XOR
TRUE |I-Code/Editor |
FALSE |I-Code/Editor |
EOF() |I-Code/Editor |
TRIM$() |I-Code/Editor |
MID$() |I-Code/Editor |
LEFT$() |I-Code/Editor |
RIGHT$() |I-Code/Editor |
CHR$() |I-Code/Editor |
STR$() |I-Code/Editor |Byte/Integer
STR$() |I-Code/Editor |Real
DATE$ |I-Code/Editor |
TAB |I-Code/Editor |
<ritc> |I-Code/Editor |Real->Byte/Integer Type Conversion
<fix1> |I-Code/Editor |Fix Top of Stack
<fix2> |I-Code/Editor |Fix Second on Stack
<fix3> |I-Code/Editor |Fix Third on Stack
<irtc> |I-Code/Editor |Byte/Integer->Real Type Conversion
<flt1> |I-Code/Editor |Float Top of Stack
<flt2> |I-Code/Editor |Float Second on Stack
NOT() |I-Code/Editor |
- |I-Code/Editor |(Monadic) Negate Byte/Integer
- |I-Code/Editor |(Monadic) Negate Real
AND |I-Code/Editor |
OR |I-Code/Editor |
XOR |I-Code/Editor |
> |I-Code/Editor |Byte/Integer Comparison Operator
> |I-Code/Editor |Real Comparison Operator
> |I-Code/Editor |String Comparison Operator
< |I-Code/Editor |Byte/Integer Comparison Operator
< |I-Code/Editor |Real Comparison Operator
< |I-Code/Editor |String Comparison Operator
<> |I-Code/Editor |Byte/Integer Comparison Operator >< is converted to <> in the code
<> |I-Code/Editor |Real Comparison Operator >< is converted to <> in the code
<> |I-Code/Editor |String Comparison Operator >< is converted to <> in the code
<> |I-Code/Editor |Boolean Comparison Operator >< is converted to <> in the code
= |I-Code/Editor |Byte/Integer Comparison Operator
= |I-Code/Editor |Real Comparison Operator
= |I-Code/Editor |String Comparison Operator
= |I-Code/Editor |Boolean Comparison Operator
>= |I-Code/Editor |Byte/Integer Greater/Equal Operator
>= |I-Code/Editor |Real Greater/Equal Operator
>= |I-Code/Editor |String Greater/Equal Operator
<= |I-Code/Editor |Byte/Integer Less/Equal Operator
<= |I-Code/Editor |Real Less/Equal Operator
<= |I-Code/Editor |String Less/Equal Operator
+ |I-Code/Editor |Byte/Integer Add Operator
+ |I-Code/Editor |Real Add Operator
+ |I-Code/Editor |String Concantenate Operator
- |I-Code/Editor |Byte/Integer Subtract Operator (Dyadic)
- |I-Code/Editor |Real Subtract Operator (Dyadic)
* |I-Code/Editor |Byte/Integer Multiply Operator
* |I-Code/Editor |Real Multiply Operator
/ |I-Code/Editor |Byte/Integer Divide Operator
/ |I-Code/Editor |Real Divide Operator
^ |I-Code/Editor |Exponent Operator
** |I-Code/Editor |Exponent Operator
varm/p |I-Code/Editor |Instruction, Simple/Record, Parameter Variable Mirror
vectorm/p |I-Code/Editor |Instruction, 1 Dimensional Array, Parameter 1 Dimensional Array Mirror
tablem/p |I-Code/Editor |Instruction, 2 Dimensional Array, Parameter 2 Dimensional Array Mirror
matrixm/p |I-Code/Editor |Instruction, 3 Dimensional Array, Parameter 3 Dimensional Array Mirror
field |I-Code/Editor |Instruction, Field Variable
UPDATE |Editor |
fvector |I-Code/Editor |Instruction, Field 1 Dimensional Array
EXEC |Editor |
ftable |I-Code/Editor |Instruction, Field 2 Dimensional Array
DIR |Editor |
fmatrix |I-Code/Editor |Instruction, Field 3 Dimensional Array
|Unused |
|Unused |
|Unused |
|Unused |
|Unused |
" |I-Code/Editor |STRING Constant - Terminator