PCMCIA PROBLEMS w MODEM

I have a Cirrus Logic CL MD 56xx based pcmcia card modem.
The supported pcmcia modems from Cirrus Logic, so far, are :
CL PD67xx series.
Question: can I use a “legacy” mode to utilize my card?
is there a “work-a-round” possible?

PS. this is in regard to QNXRTP dwnload.

Thanks, in advance, to all who reply!