I am a former TacT owner and was active in the Tact Users' Group. If you PM me with your email address, I will send it to the guy who still maintains an archive of TacT software and firmware.
I don’t know if it’s still up and running, but there used to be a TacT users group up on Yahoo. I seem to recall that like some other such Yahoo groups it might have been hacked.
I don’t know how far you’ll get, but it might be worth reaching out to the Lyngdorf crowd.
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