VDU 23,nr,eight colour bytes.
This VDU defines one of the ECF patterns; nr is 2-5 for pattern 1-4.
Each of the eight colour bytes define one row of the ECF pattern, and there are two modes: a BBC-mode, and a RISC OS mode.
To choose mode, use VDU 23,17,4.
Bit 0-7 in each colour byte,is used as follows:
BPP BBC pixels RISC OS pixels
1 7,6,5,4,3,2,1,0 0,1,2,3,4,5,6,7
2 73,62,51,40 10,32,54,76
4 7531,6420 3210,7654
8 76543210 76543210
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