DRAM chips
Model A/B
The Model B uses a total of sixteen 4816 DRAM chips to give it 32K of RAM. These chips are arranged in two banks of eight chips, /CAS0 and /CAS1. Each chip provides one bit of storage for 16,536 (16K) memory locations. The Model A uses only one bank, /CAS1. The use of either or both memory banks is controlled by selection jumper S25.
Errors in a particular bit will correspond to a specific IC:
| /CAS0 | /CAS1 | |
|---|---|---|
| D0 | IC61 | IC53 |
| D1 | IC62 | IC54 |
| D2 | IC63 | IC55 |
| D3 | IC64 | IC56 |
| D4 | IC65 | IC57 |
| D5 | IC66 | IC58 |
| D6 | IC67 | IC59 |
| D7 | IC68 | IC60 |
