| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | PC16553 |  1Mb/37P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs plus High Performance Parallel Interface |
| PC16553V |  1Mb/37P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs plus High Performance Parallel Interface |
 National Semiconductor ... | PC16550D |  344Kb/22P | PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16550DN |  344Kb/22P | PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16550DV |  344Kb/22P | PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16550DVEF |  344Kb/22P | PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16550DVX |  84Kb/3P | Engineering Project Manager |
 National Semiconductor ... | PC16552C |  827Kb/22P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs |
| PC16552CV |  827Kb/22P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16552D |  291Kb/21P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs |