| Компонент | Описание | Производитель | |
| NMC6551 | 1024-Bit (256 x 4) Static RAM |
National Semiconductor |
|
| NMC6551J | 1024-Bit (256 x 4) Static RAM |
National Semiconductor |
|
| NMC6551J-2 | 1024-Bit (256 x 4) Static RAM |
National Semiconductor |
|
| NMC6551J-5 | 1024-Bit (256 x 4) Static RAM |
National Semiconductor |