HMOVE extra CLK pulses
                    |                 HMOVE cycle
HCOUNT  TIA   CPU   | 73      74      75      0       1       2       3
        CLK   CLK   |                                                        	
---------------------------------------------------------------------------
0       0     0     | 1*      1                       
1       4     1.33  | 2       2       1       
2       8     2.67  | 3       3       2       1   
3       12    4     | 4*      4*      3*      2*      1*      1
4       16    5.33  | 5       5       4       3       2       2       1
5       20    6.67  | 6       6       5       4       3       3       2
6       24    8     | 7*      7*      6*      5*      4*      4*      3*
7       28    9.33  | 8       8       7       6       5       5       4
8       32    10.67 | 9       9       8       7       6       6       5
9       36    12    | 10*     10*     9*      8*      7*      7*      6*
10      40    13.33 | 11      11      10      9       8       8       7
11      44    14.67 | 12      12      11      10      9       9       8
12      48    16    | 13*     13*     12*     11*     10*     10*     9*      
13      52    17.33 | 14      14      13      12      11      11      10
14      56    18.67 | 15      15      14      13      12      12      11
15      60    20    |                 15*     14*     13*     13*     12*
16      64    21.33 |                         15      14      14      13
17      68    22.67 |                                 15      15      14
-------NORMAL HBLANK END----------
18      72    24    |             |                                   15*
19      76    25.33 |             |
                                  --EXTENDED HBLANK END (hmove bar) ---------

* = a RESXX on this cycle causes race condition with the extra CLK pulse.