124. VDU oddities ~~~~~~~~~~~~ VDU19, which chooses foreground and background colours from the palette, is equivalent to pressing . I shall represent it by |S, since this is how you would store it on a red key. To select a foreground colour of Green in Mode 0, you could use VDU19,1,2,0,0,0 or press |S followed by the keys 1 2 0 0 0 in turn. To send a zero byte in this way properly involves pressing |@. By pressing the 0 key directly, you are actually sending ASCII code 48. Thus you have sent the equivalent of VDU19,49,50,48,48,48 and in fact it does work perfectly as a VDU command; try it and see! You can do it 'properly' by pressing |S |A |B |@ |@ |@ I'm not quite sure what practical use you can put this new-found knowledge to, but there it is for what it's worth!