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/devices/pci@0,0/isa@7/asy@1,3f8:a,cu is definitely an old-fashioned parallel port from the DOS days -- ISA bus, IRQ 7, port 0x3f8. I remember programming those with peek and poke... It's almost...

Alright then, ls -l /devices/pci@0,0/isa@7/asy@1,3f8:a,cu

Actually: That looks odd to me. ISA as in ISA bus? 7 as in IRQ 7? That sounds like a parallel port.

Does /dev/cua/a actually exist? What are its permissions?