I am pleased to let you know that I have my 1884 up and running under Win 10x64!
I'll keep y'all posted as to how/if it keeps working.
I have seen posts on the Tascam Users Forum that "its working! whoops, its not working.
I'll be getting a tutorial up on my 1884 site ASAP.
I'm cautiously optimistic that we may be able to keep our beloved 1884's going a bit longer.
 
PM for details if you need help.
 
Tom