| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | DPC2020R |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |
| DPC2020RM-2 |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |
| DPC2020RM-4 |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |
| DPC2020RMS-4 |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |
| DPC2021RM-4 |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |
 National Semiconductor ... | DPC2020R |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |
| DPC2020RM-2 |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |
| DPC2020RM-4 |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |
| DPC2020RMS-4 |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |
| DPC2021RM-4 |  501Kb/10P | Thin-Film or MIG Head Read/Write Preamplifier February 1994 |