There is a 4 port and an 8 port version:

it's a plain 4 port or 8 port puc device:

puc0 at pci0 dev 12 function 0 "Sunix 40XX" rev 0x01: ports: 8 com
pccom3 at puc0 port 0 apic 2 int 16 (irq 11): ti16750, 64 byte fifo
pccom4 at puc0 port 1 apic 2 int 16 (irq 11): ti16750, 64 byte fifo
pccom5 at puc0 port 2 apic 2 int 16 (irq 11): ti16750, 64 byte fifo
pccom6 at puc0 port 3 apic 2 int 16 (irq 11): ti16750, 64 byte fifo
pccom7 at puc0 port 4 apic 2 int 16 (irq 11): ti16750, 64 byte fifo
pccom8 at puc0 port 5 apic 2 int 16 (irq 11): ti16750, 64 byte fifo
pccom9 at puc0 port 6 apic 2 int 16 (irq 11): ti16750, 64 byte fifo
pccom10 at puc0 port 7 apic 2 int 16 (irq 11): ti16750, 64 byte fifo