CHAIN

The CHAIN ​​command is a powerful tool used to load and execute another ugBASIC program from mass storage (such as a floppy disk), terminating the current program. This feature is useful on computers with limited memory, as it allows large applications to be broken down into smaller, more manageable modules or programs that can be "chained" together. Using CHAIN ​​allows you to create complex programs that would otherwise not fit entirely into the available RAM.

The CHAIN ​​command syntax requires a filename, which should represent the binary file located on the mass storage device. It is therefore not the name of the BASIC source file. When this instruction is executed, the current program is overwritten with the loaded one and executed from the beginning.

Therefore, the ugBASIC program to be called with the CHAIN ​​command must first be compiled into the specified binary format. Only then should this compiled file be inserted into the STORAGE definition, and the symbolic name can be used to load the program.

Finally, it is important to note that the program to be loaded must also use the CHAIN ​​command or, alternatively, use the DEFINE CHAIN ​​directive at the head of the program.

EXAMPLE

 CHAIN "t1"