I just got a used FW1884 to supplement my FW1082 that I am using on Windows 7 and on OsX 10.8.4 with Logic. Just the control surface, but as someone pointed out, the audio section isn't all that stellar anyway. You say on 64 bit macintosh?? yes.
I hope to get the FW1884 working as well, we'll see how it goes. My method is to use a machine that has a driver as a gateway and connect it to the OsX 10.8 machine over the LAN.
Macs have Network MIDI, and Windows has RtpMIDI. I use my Win7-64 DAW machine with the 1.8 64 bit driver, and switch the virtual connection so either the Windows DAW or the Mac DAW uses the FW1082. You could use an older Mac running 32 bit OsX to do the same thing. On Windows you need Rtp.MIDI to make the connection over the LAN. On OsX you have the equivalent as Network MIDI, they even have identical setup panels.
Truth be told, the switching is the worst part, and if you throw a handheld into the stew it's virtual spaghetti. So maybe I'll devote one control surface permanently to each DAW. But once connected the FW1082 control surface works as well as it ever did with Logic.
The virtual connection is not specific to Logic, it should work with any Macintosh DAW software that understands the TASCAMs native mode, or its other modes like Mackie and HUI for that matter.
Here is a link to the procedure for making the FW1082 work with Logic X (Apple added insult to injury by removed the TASCAM template from the app with version 10.0.5):
https://www.gearslutz.com/board/10483306-post34.html
I'll put up more info on this forum once I determine if the same works OK for the FW1884.
As to writing a modern OsX driver, it could be anything from "eminently doable" to "very very difficult". It's not an application. "Just recompiling for 64 bits" is generally a pipe dream in the world of drivers.
Thank heaven for the 64 bit TASCAM Windows driver! Both OsX and Logic are 64 bit only - special case, need ninja tactics. But I rather expect the existing Windows 64 bit drivers can be shoe-horned into Windows 8 if you get past the installation. I'm not leaping at Windows 8 at the moment any more than at Maverick or Snow Maverick or whatever. Don't fix it if it ain't broke.
And DAMN it took me days to find this:
to invoke the FW1884 demo mode or POST or Self-Test (or whatever you call it) you hold all 4 REW + STOP + REC + SET keys while you power it up.
There's a factory reset invoked by holding PAN + FLIP + AUX3 + AUX4 and simultaneously power on.
And you guys on the 3 year Behringer warranty watch out, I learned the hard way the standard warranty on Behringer gear is 1 year, extensible to 3 if you register the product just so. I just squeezed by on the replacement of an FCA610.