The System device provides mapping for system-defined registry like stack pointers, program counter, and also user-defined registers. It also provides ways to check the status of the system, debugging, and managing errors.

;system
.macro system.state           $00
.macro system.error           $01
.macro system.random          $02
.macro system._on_error       $03
.macro system._image_exec     $05

=== [1][RW] state A byte identifying the state of the virtual machine using the following values: 00000000 - system off 00000001 - system running 00000002 - system waiting for event Plus, as needed, the following bitmasks: 01000000 - debug mode enabled 10000000 - error If an error occurs, the error bit will be set as long as an error is set in the appropriate byte (see below). === [1][RO] error A byte indicating the last error. The high nibble identifies the device where the error occurred: 00 - no error 0x - system error 1x - terminal error 2x - clock error 3x - file error 4x - beeper error -> See errors for more information. Note: the error handler must clear this error after handling it, or the error handler will keep getting executed. === [1][RO] random When read, returns a random value between 0 and 255. === [2][RW] _on_error Address of the subroutine that will be executed in case of an error. === [2][RW] _image_exec Attempts to load and execute the image file specified at this address with space-separated parameters. Before the image is executed, a full snapshot of the parent image is created, and it will be restored when the child image exits. The maximum number of child images that can be executed is 8.