# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1357435393 -3600
# Node ID 5d82dab6add346641377d59c22e4d645b78bca9d
# Parent  575d8cc03fcee91e86470c7af058030e0a51866f
Described how the inversion bitmap would be used to update each flashing colour.

diff -r 575d8cc03fce -r 5d82dab6add3 ULA.txt
--- a/ULA.txt	Sat Dec 22 02:22:47 2012 +0100
+++ b/ULA.txt	Sun Jan 06 02:23:13 2013 +0100
@@ -333,6 +333,12 @@
   14                      10001000
   15                      10001000
 
+For example, where logical colour 0 has been mapped to a physical colour in
+the range 8 to 15, a bitmap of 00010001 would be chosen as its contribution to
+the inversion operation. (The lower three bits of the physical colour would be
+used to set the underlying colour information affected by the inversion
+operation.)
+
 An operation in the interrupt code would then combine the bitmaps for all
 logical colours in 2 and 4 colour modes, with the 16 colour bitmaps being
 combined for groups of logical colours as follows: