Greetings Wizards!

Does anybody have more information on /dev/fastflop & /dev/rfastflop
device nodes available on UnixWare 7/OpenUNIX 8 systems, like their
uses, filesystems supported, how exactly can one use them etc? I
searched the web for more information on these devices, but didn't get
lucky. Neither did the man page search help me.

Please pass me any info you have on these device nodes.