These are EPROM integrated circuit in a 28 pin dip package.
| Order# | Description | Processing speed |
| 27C128-70 | EPROM 16K x 8 | 70ns |
| 27C128-10 | EPROM 16K x 8 | 100ns |
| 27C128-12 | EPROM 16K x 8 | 120ns |
| 27C128-15 | EPROM 16K x 8 | 150ns |
| 27C128-20 | EPROM 16K x 8 | 200ns |
| 27C128-25 | EPROM 16K x 8 | 250ns |
WARNING
