Colibri VF61 Computer on Module Real-Time demo controls an XY Pen Plotter using a Colibri VF61. In the demo, the VF61 Computer module ( ), with its two cores of ARM® Cortex™-A9, and ARM® Cortex™-M4, is utilised to run an XY pen-plotter. The plotter is controlled by a custom eCos® RTOS based firmware on the Cortex™-M4 core. The user interface is created using Qt, running on Linux, on the Cortex-A5™ core.