TelescopeMan describes a Signalink (sound card) used to connect an amateur radio to a computer. There is also another popular device called a Rigblaster. Links to these products are shown in the comments.
Be sure to turn off and or minimize ALC and AGC. On my Flex radio I use the "FAST" setting. On a regular radio very little or NO ALC/AGC should show on the radio's meter. Once this is setup you will be able to work FT8, JT65, RTTY, JT9, PSK31, and a multitude of other digital modes on amateur radio.
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