PLOT 69,x,y should set the current position to X,Y ; it appears not to.

e.g.
PLOT 69,100,100 : PLOT 5,200,100 doesn't draw a line*
PLOT 4,100:100:PLOT 5,100,100 does

Actually it does, but it draws it from a random ? place, probably the initial uninitialised drawing position. It's not where it's supposed to be

Verified behaviour on JSBEEB

Appears to be a feature of fabGL ; calling SetPixel does ... just that and nothing else.

I think this is fixable by :

adding canvas->moveTo(p1.X, p1.Y) in plotPoint() in graphics.h ?

NB: In the documentation it says VDU 25,0,640;512; plots a point. This is incorrect ; it should be 25,69,640;512;