How to set up a Yaesu FT-991 for FT-8 using the WSJT-X software - YouTube
Yaesu USB Driver Update - morsetutor.com
FT991: The Smart Choice - N6PET - My Ham Radio Journal
Yaesu FT-991 Digital modes setup - morsetutor.com
Welcome to Yaesu.com
Yaesu FT-991A HF VHF UHF & C4FM 100W
Please use this setup by N1RWY to start with (I've modified them to fit the FT-991A This set up only concerns Winmor and not Pac
Data mode communication on the Yaesu FT-991 - Amateur radio tips and how-to guides
Usb Pc Linker Adapter Radio Connector For Yaesu Ft-450d Ft-950d Dx1200 Ft- 991 Ic-2710/2720/2820 Ft7800\8800\8900\100d U5 Link - Earphone Accessories - AliExpress
FT-991 setup for digital modes (with only a USB cable) – N1AV (x-N1RWY) on the air