Physical screen memory


I am a newcomer to bb4w, but not a newcomer to BASIC. In the good old days of the BBC micro it was possible to access the PSM with ?&xxxx=c% to plot a coloured dot on the screen (all be it with a bit of decoding for MODE 2), I can not find a way in bb4w to reproduce this (it was how I generated quick coloured graphics without the need for assembly language), can anyone help?

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