Originally Posted by DyLucke
Would that mean if one of the chips gets ruined the board wouldn't work at all?
I guess that's the case on pretty much every computer board: Every chip has a key function and for proper operation, all chips must be present and working.
The 64M (32M) memory of the ACA1230 (ACA630) cards is composed of two chips, where both of them are always selected at the same time. The chips are 16 bits wide each, so in order to form a full 32-bit word, both memory chips must be present and they must work properly.