Data Types

Certain code elements must start or end with specific characters. They help the compiler to recognize their meaning. The following list is final and contains all types of data known to the compiler.


A global variable starts with $ followed by a valid identifier (any combination of letters, digits and _).

0004: $MyVar = 100

A local variable name may only be a number followed by @. The number is the local variable index in the list of local variables allocated to this script or a mission.

An ADMA (Advanced Direct Memory Access) variable is a reference to an address within in the main.scm file. They serve as global variables, i.e. you can read from and write to the address in the main.scm.

$myVar = &0 // read first 4 bytes of the main.scm (&0) and write the value to $myVar
&57 += &120(&231,4i) // can be used as an array element

ADMA variables don't affect the size of the global variables space in the main.scm header.


Labels are used to reference the code location from unconditional (opcodes 0002, 0050) or conditional jumps (opcode 004D). They start with :followed by a valid identifier (a label name).


To reference the label from an opcode use @ and then write the label name.

0002: jump @MyLabel

If a label name is written as a standalone statement followed by () it represents a call to the subroutine with the gosub command:

// the following statements are equivalent
gosub @MyLabel

String literals

A text enclosed between single quotes ' ' is a short string literal (15 characters max).

03A4: script_name 'MAIN'

Blank strings are also allowed: ' '.

A text enclosed between " " is a long string literal (maximum length is determined by the opcode it uses)

If the literal contains " you must write \ before it.

0662: write_debug_message "Hello, \"world\"! \n 'Here we go!'"

Blank strings are also allowed: " ".

String Variables

A global variable containing a short string literal starts with s$.

05A9: s$MyString = 'GLOBAL'

A local variable containing a short string literal starts with@s.

05AA: [email protected] = 'LOCAL'

A global variable containing a long string literal starts with v$.

06D1: v$MyString = "LONG_GLOBAL"

A local variable containing a long string literal starts with@v.

06D2: [email protected] = "LONG_LOCAL"

Model Names

Models defined in .ide files can be referenced by# followed by the model name.

0247: request_model #CELLPHONE

Hexadecimal Numbers

0x - a hexadecimal number -0x - a negative hexadecimal number

0004: $var = -0xBB08

A hexadecimal number has to be within the -80000000..7FFFFFFF range.