Synchronous Serial Card needed

1. Suggestion for synchronous serial IO card needed

I am in search of an synchronous serial IO card which runs under linux. The
card should also be a PCMCIA card. I found an announcement of an card named
Sealevel in the net but the website doesn't contain information wether the
card runs on linux. Are their any people out there who are having
experience with synchronous serial IO cards?

Thanks in advance, Ralf.

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