VDU 23,nr,n1,n2,n3,n4,n5,n6,n7,n8
This VDU defines one of the ECF patterns; nr is 12-15 for pattern 1-4.
For 2,4 and 16 colour modes this defines the patterns as a repeated 2 × 4 block of pixels with the given logical colours:
n1 n2
n3 n4
n5 n6
n7 n8
In 256 colour modes the parameters define the eight rows.
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