VDU 25,command,x;y;
This VDU executes a plot command.
As the VDU system only accepts signed 16 bit coordinates this limits the maximum resolution for printing on large paper, so OS_Plot should be used in preference as this allows signed 32 bit coordinates - thus allowing the VDU system to be upgraded in future.
It is also faster (and simpler) to use the SWI OS_Plot directly.
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