My understanding is the classic generic radio to emulate via hamlib is the Kenwood TS-2000.
At least this is what the Flex product line does going back to the days of the Flex 1500 which I bought in the mid 2000s.
Seems this was a popular radio as hamlib was being developed.
I actually have one but have never attached it to any computer.
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Regards,
Dave, N1AI