UMCS(4) NetBSD Kernel Interfaces Manual UMCS(4)
umcs -- USB multiport serial adapters driver
umcs* at uhub? ucom* at umcs?
The umcs driver supports a wide variety of hardware based on the MosChip 7810, 7820, 7840 chipsets and clones thereof. Devices range from single port to eight port (implemented as a USB hub and two umcs four port instances behind it). Examples of hardware known to work with this driver are: LOGILINK AU0033
The umcs driver attaches the MosChip multiport chipset with individual port drivers via ucom(4), which makes it behave like a tty(4).
tty(4), ucom(4), usb(4)
The umcs driver appeared in NetBSD 7. NetBSD 9.0 May 7, 2019 NetBSD 9.0
You can also request any man page by name and (optionally) by section: