StarTech is usually a little expensive but seems to have the toy for you: https://www.amazon.it/STARTECH-COM-RS232-Seriale-Porte-Convertitore/dp/B01L3H56CK/
They do interesting stuff for usb sticks too. Also the dongle exists.. for 1 port: https://5md.es/l/148220d I used it in the past to pay love to my Juniper firewall. P.S: Jan, it is OT!!! no OpenBSD contribution!!! next time mail me directly and not to the mailing list!!! * * the !!! are taken from mom.. :D > N0\/\/@r€Z > ---------- > /\/\@rk€T Feb 8, 2024 10:04:11 Jan Stary <h...@stare.cz>: > What HW do people use to read data from many serial ports > simultaneously? My use case is reading the output of > https://en.wikipedia.org/wiki/Electropalatography > The device has eight serial port outputs; > I need to read those at the computer side.