Amstrad PC1640 DRAM Mappings - Z70350 / MC0040E

| Chip  | Bit |
| -------- | -----  |
| IC135 | L0  | 
| IC136 | L1  |  
| IC137 | L2  | 
| IC138 | L3  | 
| IC139 | L4  | 
| IC140 | L5  | 
| IC141 | L6  | 
| IC142 | L7  | 
| IC143 | LP  | 
| IC144 | H8  |
| IC145 | H9  |
| IC146 | H10 | 
| IC147 | H11 |
| IC148 | H12 |
| IC149 | H13 | 
| IC150 | H14 | 
| IC151 | H15 |
| IC152 | HP  |