[Oberon] FPGA - Screen.Mod

[Tomas Kral]

> According to the bmp definition: for BPP = 4, the left-most pixel is
> the most-significant nibble.

Thank you for bearing with me. 

Nibbles seems right as otherwise I would get garbled text, but I don't.
Testing to reorder the map, see pict, which then shows the right cols in
BMP.

Oberon order
0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15

BMP order
15 7  3  11 1  9  5  13 0  8 4  12 2  10 6  14

I guess for invert video, I just go the opposite?
14 6  10 2  12 4  8  0  13 5 9  1  11 3  7  15


-- 
Tomas Kral <thomas.kral at email.cz>
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