| Zoltrix Cobra FM-SFT56i | PCI | PDF | ITU-T V.90 & K56Flex SFT WinModem |
| Zoltrix Phantom FM-HSP56PCI | External Serial | PDF | ITU-T V.90 & K56Flex SFT WinModem Speakerphone |
| Zoltrix Rainbow FM-VSP56E2 | External | PDF | V.90 Fax/Modem |
| Zoltrix Rainbow Classic FM-56E | External | PDF | V.90 Fax/Modem |
| Zoltrix Spirit FM-HCF56i | PCI | PDF | V.90/K56 Flex |
| Zoltrix FM-VSP56i3 | PCI | PDF | 07/12/1998 V.90/K56 Flex 56,000 bps |