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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 | 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 |