A    B    C
0000 0000 0001
0002 0000 0000 - A = Cx2, B = ?, C = ?

0001 0000 0001
0002 0001 0000 - A = 2C, B = A, C = ?

0000 0001 0000
0800 0000 0001 - A = ?, B = A, C = B

0000 0001 0001
0802 0000 0001 - A = ?.B + 2C

0000 0002 0000
1000 0000 0002 - A = 0x800B?

0000 0003 0000
1800 0000 0003 - A = 0x800B.


HOKAY. Let's try a real world example.

8087 3B4E 8BB3
		A = 3b4e x 0x800 + 8bb3 x 2
8766 8087 3B4E
		A = 8087 x 0x800 + 3b4e x 2
		A = 3800 + ...
AE9C 8766 8087 WRONG




0200 .... ....
0010 .... ....

0100 .... ....
0008 .... ....

so...
A =
A / 0x0020 +
B x 0x0800 +
C x 0x0002

try again

8087 3B4E 8BB3

A = 
8087 / 20  +
3B4E x 800 +
8BB3 x 2
=
404 + 7000 + 1766
=
8B6A WRONG

6362

.... 3B4E 8BB3
6766 0000 3B4E
expected
8766 0000 3B4E

How can
7000 . 1766 = 6766

XOR
00001011 00000000 00000000 00000000
00000001 00001011 00001010 00001010
-----------------------------------
00001010 00001011 00001010 00001010
6766

try
A =
(A / 0x0020 +
 B * 0x0800) ^^
 C * 0x0002

404 + 7000 = 7404
7404 ^^ 1766 =...

00001011 00001000 00000000 00001000
00000001 00001011 00001010 00001010
-----------------------------------
00001010 00000011 00001010 00000010
=
6362
YES