Notes
Simple commands: FR x advances x units, ES/DI x turns left/right by x degrees, SC and PD toggles the pen on/off. Full command list in pt language and an example script in Extras folder. VB and DB are the actual commands to toggle the eraser on/off and the eraser’s brush stays on top of drawings, even when cleaning the screen.
Source
https://archive.org/details/objetivo5serie2bim