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The graphics commands in Superbasic provide a very convenient tool for the screen designer because they automatically look after the X:Y scaling, but this can be a problem if you mix them with pixel based commands like BLOCK, or text positioned with the AT or CURSOR keywords.
I had been looking into how one can use the graphics commands to address individual pixels, and, in the process, stumbled = upon another difference between the JSU and the various UK ROMS, the X:Y scaling factors are not the same: The same graphics command puts everything about 15% further to the right on the screen on a JSU machine than with a UK machine, which is why some UE originated programs look distinctly odd over here’?