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	GLOBAL |Reserved |Global Variable	PARAM |Editor |	READ |I-Code |File Mode	TYPE |Editor |	WRITE |I-Code |File Mode	DIM |Editor |	UPDATE |I-Code |File Mode	DATA |I-Code/Editor |	EXEC |I-Code |File Mode	STOP |I-Code/Editor |	READ+EXEC |I-Code |File Mode	BYE |I-Code/Editor |	WRITE+EXEC |I-Code |File Mode	TRON |I-Code/Editor |	UPDATE+EXEC |I-Code |File Mode	TROFF |I-Code/Editor |	PAUSE |I-Code/Editor |	DEG |I-Code/Editor |	RAD |I-Code/Editor |	RETURN |I-Code/Editor |	LET |I-Code/Editor |	<cva> |I-Code/Editor |Complex Variable Assignment	POKE |I-Code/Editor |	IF |I-Code/Editor |	ELSE |I-Code/Editor |	ENDIF |I-Code/Editor |	FOR |I-Code/Editor |	NEXT |I-Code/Editor |	WHILE |I-Code/Editor |	ENDWHILE |I-Code/Editor |	REPEAT |I-Code/Editor |	UNTIL |I-Code/Editor |	LOOP |I-Code/Editor |	ENDLOOP |I-Code/Editor |	EXITIF |I-Code/Editor |	ENDEXIT |I-Code/Editor |	ON |I-Code/Editor |	ERROR |I-Code/Editor |	GOTO |Editor |Unbound	GOTO |I-Code/Editor |Bound	GOSUB |Editor |Unbound	GOSUB |I-Code/Editor |Bound	RUN |I-Code/Editor |	KILL |I-Code/Editor |	INPUT |I-Code/Editor |	PRINT |I-Code/Editor |? Becomes PRINT in the Editor	CHD |I-Code/Editor |	CHX |I-Code/Editor |	CREATE |I-Code/Editor |	OPEN |I-Code/Editor |	SEEK |I-Code/Editor |	READ |I-Code/Editor |	WRITE |I-Code/Editor |	GET |I-Code/Editor |	PUT |I-Code/Editor |	CLOSE |I-Code/Editor |	RESTORE |I-Code/Editor |	DELETE |I-Code/Editor |	CHAIN |I-Code/Editor |	SHELL |I-Code/Editor |	BASE 0 |I-Code/Editor |	BASE 1 |I-Code/Editor |	REM |Editor |! Becomes REM in the Editor	(* |Editor |	END |I-Code/Editor |	<ulrf> |I-Code/Editor |Unbound Line Reference	<blrf> |I-Code/Editor |Bound Line Reference	<dex> |I-Code/Editor |Direct Execution	PROCEDURE |Editor |Procedure start	<erl> |Editor/Debug |Error Line	\ |I-Code/Editor |End-of-Instruction, Continue Line	<eol> |I-Code/Editor |End-of-Instruction and Line	BYTE |Editor |	fbyte |I-Code/Editor |VDT Entry, Field Byte Variable	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