16 Bit Mode - RGB?

Here is a link explaining RGB Formats

I have gathered the most relevant info into this table.
Hope it's right!

RGB Formats
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16 Bit RGB555
====================
%1111 1111 1111 1111
  rrr rrgg gggb bbbb

16 Bit RGB565
====================
%1111 1111 1111 1111
 rrrr rggg gggb bbbb

24 Bit RGB888
==============================
%1111 1111 1111 1111 1111 1111
 rrrr rrrr gggg gggg bbbb bbbb

32Bit ARGB8888
========================================
%1111 1111 1111 1111 1111 1111 1111 1111
 aaaa aaaa rrrr rrrr gggg gggg bbbb bbbb

There is an example in Blitz+ by Mark called lock_graphics.bb (in the samples\mak folder).
Worth a look.