Model: HSP 56K Micromodem
Operating System: Windows 2000 (Note: might work with other versions of this os.)
The Zoltrix modem is the FMHSP56p PCtel Windows 2000 Modem Driver. They have posted two drivers, one for MMX chips and one for non-MMX. I am running a 200 Mhz Pentium Pro with 64 MB ram and it is working fine.