OSWORD &0A (10): Read character definition
On entry: XY?0=character On exit: XY+1..8=the character raster data. The results for characters 0..31 are undefined. The result for character 127 is whatever has been programmed with VDU 23,127, defaulting to a solid block. OS 3.00 onwards: The ECFs definable with VDU 23,2-5 are readable with by reading characters 2-5. The dotted line pattern definable with VDU 23,6 is readable by reading character 6.