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The Structure of I-Code

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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
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