A test

Tried to test the schematic with a simple program.


  C0=0               C0=1
 0123456789ABCDEF   0123456789ABCDEF
0..........******0 0..........******0
1.........*******1 1.........*******1
2........********2 2........********2
3.......*********3 3.......*********3
4......**********4 4......**********4
5.....***********5 5.....***********5
6....************6 6....************6
7...*************7 7...*************7
8..**************8 8..**************8
9.***************9 9.***************9
A****************A A****************A
B****************B B****************B
C****************C C****************C
D****************D D****************D
E****************E E****************E
F****************F F****************F
 0123456789ABCDEF   0123456789ABCDEF

C0 is the ALU carry input.

C4' is the carry output (with pseudo_tetrade detection).

It's row + column,
'.' indicates that C4'=0,
'*' indicates that C4'=1.

Examples:
C0=0, 8+1+0= 9 -> C4'=0,
C0=0, 9+1+0=10 -> C4'=1,
C0=1, 8+1+1=10 -> C4'=1,
C0=1, 9+1+1=11 -> C4'=1.

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