| Manufacturer | Part Number | Description |
|---|---|---|
| Ferranti Electric | ZN434 | Low Cost 4-Bit D-A Converter |
| Ferranti Electric | ZN1040E | Universal Count / Display Circuit |
| Ferranti Electric | ZN433 | 10-Bit Tracking Monolithic A/D Converter |
| Ferranti Electric | ZN1040AE | Universal Count / Display Circuit |
