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:
| D0 | D1 | D2 | D3 | D4 | D5 | D6 | D7 | |
|---|---|---|---|---|---|---|---|---|
| /CAS0 | IC61 | IC62 | IC63 | IC64 | IC65 | IC66 | IC67 | IC68 |
| /CAS1 | IC53 | IC54 | IC55 | IC56 | IC57 | IC58 | IC59 | IC60 |
