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
finteger |I-Code/Editor |VDT Entry, Field Integer Variable
REAL |Editor |
freal |I-Code/Editor |VDT Entry, Field Real Variable
BOOLEAN |Editor |
fboolean |I-Code/Editor |VDT Entry, Field Boolean Variable
STRING |Editor |
fstring |I-Code/Editor |VDT Entry, Field String Variable
THEN |I-Code/Editor |
frecord |I-Code/Editor |VDT Entry, Field Record Variable
TO |I-Code/Editor |
STEP |I-Code/Editor |
DO |I-Code/Editor |
fvectorb |I-Code/Editor |VDT Entry, Field 1 Dimensional Byte Array
USING |I-Code/Editor |
fvectori |I-Code/Editor |VDT Entry, Field 1 Dimensional Integer Array
: |I-Code/Editor |File Mode Operator
fvectorr |I-Code/Editor |VDT Entry, Field 1 Dimensional Real Array
, |I-Code/Editor |Comma Separator
fvectorl |I-Code/Editor |VDT Entry, Field 1 Dimensional Boolean Array
: |I-Code/Editor |Colon
fvectors |I-Code/Editor |VDT Entry, Field 1 Dimensional String Array
( |I-Code/Editor |Left Parenthesis
fvectoru |I-Code/Editor |VDT Entry, Field 1 Dimensional Record Array
) |I-Code/Editor |Right Parenthesis
[ |I-Code/Editor |Left Bracket
] |I-Code/Editor |Right Bracket
ftableb |I-Code/Editor |VDT Entry, Field 2 Dimensional Byte Array
; |I-Code/Editor |Semi-colon
ftablei |I-Code/Editor |VDT Entry, Field 2 Dimensional Integer Array
:= |I-Code/Editor |Assignment Operator
ftabler |I-Code/Editor |VDT Entry, Field 2 Dimensional Real Array
= |I-Code/Editor |Assignment Operator
ftablel |I-Code/Editor |VDT Entry, Field 2 Dimensional Boolean Array
# |I-Code/Editor |Channel (Path) Number Operator
ftables |I-Code/Editor |VDT Entry, Field 2 Dimensional String Array
<ivgt> |I-Code/Editor |Invisible GOTO (used with IF)
ftableu |I-Code/Editor |VDT Entry, Field 2 Dimensional Record Array
|Unused |
|Unused |
fmatrixb |I-Code/Editor |VDT Entry, Field 3 Dimensional Byte Array
fmatrixi |I-Code/Editor |VDT Entry, Field 3 Dimensional Integer Array
fmatrixr |I-Code/Editor |VDT Entry, Field 3 Dimensional Real Array
fmatrixl |I-Code/Editor |VDT Entry, Field 3 Dimensional Boolean Array
fmatrixs |I-Code/Editor |VDT Entry, Field 3 Dimensional String Array
fmatrixu |I-Code/Editor |VDT Entry, Field 3 Dimensional Record Array
|Unused |
|Unused |
byte |I-Code/Editor |VDT entry, Byte Variable
integer |I-Code/Editor |VDT entry, Integer Variable
real |I-Code/Editor |VDT entry, Real Variable
boolean |I-Code/Editor |VDT entry, Boolean Variable
string |I-Code/Editor |VDT entry, String Variable
record |I-Code/Editor |VDT entry, Record Variable
|Unused |
|Unused |
vectorb |I-Code/Editor |VDT Entry, 1 Dimensional Byte Array
vectori |I-Code/Editor |VDT Entry, 1 Dimensional Integer Array
vectorr |I-Code/Editor |VDT Entry, 1 Dimensional Real Array
vectorl |I-Code/Editor |VDT Entry, 1 Dimensional Boolean Array
vectors |I-Code/Editor |VDT Entry, 1 Dimensional String Array
vectoru |I-Code/Editor |VDT Entry, 1 Dimensional Record Array
|Unused |
|Unused |
tableb |I-Code/Editor |VDT Entry, 2 Dimensional Byte Array
tablei |I-Code/Editor |VDT Entry, 2 Dimensional Integer Array
tabler |I-Code/Editor |VDT Entry, 2 Dimensional Real Array
tablel |I-Code/Editor |VDT Entry, 2 Dimensional Boolean Array
tables |I-Code/Editor |VDT Entry, 2 Dimensional String Array
tableu |I-Code/Editor |VDT Entry, 2 Dimensional Record Array
|Unused |
|Unused |
matrixb |I-Code/Editor |VDT Entry, 3 Dimensional Byte Array
matrixi |I-Code/Editor |VDT Entry, 3 Dimensional Integer Array
matrixr |I-Code/Editor |VDT Entry, 3 Dimensional Real Array
matrixl |I-Code/Editor |VDT Entry, 3 Dimensional Boolean Array
matrixs |I-Code/Editor |VDT Entry, 3 Dimensional String Array
matrixu |I-Code/Editor |VDT Entry, 3 Dimensional Record Array
|Unused |
|Unused |
byte |I-Code/Editor |Instruction, Simple Byte Variable
pbyte |I-Code/Editor |VDT Entry, Parameter Byte Variable
DIR |I-Code |File Mode
integer |I-Code/Editor |Instruction, Simple Integer Variable
pinteger |I-Code/Editor |VDT Entry, Parameter Integer Variable
READ+DIR |I-Code |File Mode
real |I-Code/Editor |Instruction, Simple Real Variable
preal |I-Code/Editor |VDT Entry, Parameter Real Variable
WRITE+DIR |I-Code |File Mode
boolean |I-Code/Editor |Instruction, Simple Boolean Variable
pboolean |I-Code/Editor |VDT Entry, Parameter Boolean Variable
UPDATE+DIR |I-Code |File Mode
string |I-Code/Editor |Instruction, Simple String Variable
pstring |I-Code/Editor |VDT Entry, Parameter String Variable
EXEC+DIR |I-Code |File Mode
record/p |I-Code/Editor |Instruction, Record, Parameter (Simple/Record) Variable
vector/p |I-Code/Editor |Instruction, 1 Dimensional Array, Parameter 1 Dimensional Array Variable
table/p |I-Code/Editor |Instruction, 2 Dimensional Array, Parameter 2 Dimensional Array Variable
matrix/p |I-Code/Editor |Instruction, 3 Dimensional Array, Parameter 3 Dimensional Array Variable
precord |I-Code/Editor |VDT Entry, Parameter Record Variable
READ+EXEC+DIR |I-Code |File Mode
vector/p |I-Code/Editor |Instruction, 1 Dimensional Array
WRITE+EXEC+DIR |I-Code |File Mode
table/p |I-Code/Editor |Instruction, 2 Dimensional Array
UPDATE+EXEC+DIR |I-Code |File Mode
matrix/p |I-Code/Editor |Instruction, 3 Dimensional Array
pvectorb |I-Code/Editor |VDT Entry, Parameter 1 Dimensional Byte Array
varm |I-Code/Editor |Instruction, Simple/Record Variable Mirror
pvectori |I-Code/Editor |VDT Entry, Parameter 1 Dimensional Integer Array
fvectorm |I-Code/Editor |VDT Entry, Field 1 Dimensional Array Mirror
pvectorr |I-Code/Editor |VDT Entry, Parameter 1 Dimensional Real Array
ftablem |I-Code/Editor |VDT Entry, Field 2 Dimensional Array Mirror
pvectorl |I-Code/Editor |VDT Entry, Parameter 1 Dimensional Boolean Array
fmatrixm |I-Code/Editor |VDT Entry, Field 3 Dimensional Array Mirror
pvectors |I-Code/Editor |VDT Entry, Parameter 1 Dimensional String Array
<blit> |I-Code/Editor |BYTE Constant (Literal)
pvectoru |I-Code/Editor |VDT Entry, Parameter 1 Dimensional Record Array
<ilit> |I-Code/Editor |INTEGER Constant (Literal)
<rlit> |I-Code/Editor |REAL Constant (Literal)
" |I-Code/Editor |STRING Constant - Beginning (Literal)
ptableb |I-Code/Editor |VDT Entry, Parameter 2 Dimensional Byte Array
$ |I-Code/Editor |Hexadecimal Constant (Literal)
ptablei |I-Code/Editor |VDT Entry, Parameter 2 Dimensional Integer Array
ADDR() |I-Code/Editor |
ptabler |I-Code/Editor |VDT Entry, Parameter 2 Dimensional Real Array
|I-Code/Editor |Second Byte of ADDR()
ptablel |I-Code/Editor |VDT Entry, Parameter 2 Dimensional Boolean Array
SIZE() |I-Code/Editor |
ptables |I-Code/Editor |VDT Entry, Parameter 2 Dimensional String Array
|I-Code/Editor |Second Byte of SIZE()
ptableu |I-Code/Editor |VDT Entry, Parameter 2 Dimensional Record Array
POS() |I-Code/Editor |
ERR() |I-Code/Editor |
MOD() |I-Code/Editor |Byte/Integer
pmatrixb |I-Code/Editor |VDT Entry, Parameter 3 Dimensional Byte Array
MOD() |I-Code/Editor |Real
pmatrixi |I-Code/Editor |VDT Entry, Parameter 3 Dimensional Integer Array
RND() |I-Code/Editor |
pmatrixr |I-Code/Editor |VDT Entry, Parameter 3 Dimensional Real Array
PI |I-Code/Editor |
pmatrixl |I-Code/Editor |VDT Entry, Parameter 3 Dimensional Boolean Array
SUBSTR() |I-Code/Editor |
pmatrixs |I-Code/Editor |VDT Entry, Parameter 3 Dimensional String Array
SGN() |I-Code/Editor |
pmatrixu |I-Code/Editor |VDT Entry, Parameter 3 Dimensional Record Array
SGN() |I-Code/Editor |
SIN() |I-Code/Editor |
COS() |I-Code/Editor |
<subr> |I-Code/Editor |Called Subroutine Name
TAN() |I-Code/Editor |
ASN() |I-Code/Editor |
ACS() |I-Code/Editor |
ATN() |I-Code/Editor |
EXP() |I-Code/Editor |
ABS() |I-Code/Editor |
ABS() |I-Code/Editor |
LOG() |I-Code/Editor |
LOG10() |I-Code/Editor |
SQRT() |I-Code/Editor |
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