"crumbled ZIPs" :-o OMG :-o
The RAMs need to be populated in this order:
3 3
2 2
1 1
0 0
3 3
2 2
1 1
0 0
3 3
2 2
1 1
0 0
3 3
2 2
1 1
0 0
as seen from the front - first bank 0, then 1, ... Your pic shows the missing top left RAMs, so the incomplete banks can't be used.
