In the Original Data Becker Rom-Image (from Christian) I found the extended basic-statements:
dot, cdot, line, cline, gclear, draw, graphics, move, fill and some more...
But how to access these commands and how to add parameters...???
After some disassembling I found out: The basic commands have a "!" as first sign!
Sadly the Data Becker Rom doesn't switch the CRTC to a screen without spaces between the character lines, like the Rom from "Walter" it does - this looks awful!