2. Supported serial hardware

Linux is known to work with the following serial hardware.

standard PC serial boards (COM1 - COM4), to which external serial devices (modems, serial mice, etc...) can be connected
standard PC internal modems (COM1 - COM4)
Quickpath Systems Port-Folio 550e (allows IRQs of 3, 4, 5, 9, 10, 11, 12, and 15)

2.1 Multiport serial boards (with 16450/16550A UARTs)

AST FourPort and clones (4 port)
Accent Async-4 (4 port)
Arnet Multiport-8 (8 port)
Bell Technologies HUB6 (6 port)
Boca BB-1004 (4 port), BB-1008 (8 port), BB-2016 (16 port)
Boca IOAT66 (6 port)
Boca 2by4 (4S/2P)
Computone ValuePort V4-ISA (AST FourPort compatible)
PC-COMM (4 port)
STB-4COM (4 port)
Twincom ACI/550
Usenet Serial Board II (4 port)

In general, Linux will support any serial board which uses a 8250, 16450, 16550, 16550A (or compatible) UART, or an internal modem which emulates one of the above UARTs.

Special note on the BB-1004 and BB-1008, they do not support DCD and RI lines, and thus are not usable for dialin modems. They will work fine for all other purposes.

2.2 Intelligent multiport serial boards

Comtrol RocketPort (36Mhz ASIC - 4, 8, 16 or 32 port) (contact info@comtrol.com or Comtrol's Home Page . Driver location: tsx-11.mit.edu/pub/linux/packages/comtrol)
Computone IntelliPort II (16Mhz 80186 - 4, 8, or 16 port) Computone IntelliPort II EXpandable (20Mhz 80186 - modular 16 - 64 port) (pre-ALPHA driver, contact Michael H. Warfield, mhw@wittsend.atl.ga.us)
Cyclades Cyclom 8Y (8 port), and 16Y (16 port) (Cirrus Logic CD-1400 RISC UARTs) (contact cyclades@netcom.com)
DigiBoard PC/Xe (12.5MHz 80186 processor - 2, 4, 8, or 16 port), and PC/Xi (12.5MHz 80186 processor - 8, or 16 port) (contact Troy De Jongh, troyd@digibd.com. Driver location: ftp.digibd.com:/digiline/drivers/linux)
Digiboard COM/Xi (10MHz 80188 processor - 4 or 8 port)
(pre-ALPHA driver contact Simon Park, si@wimpol.demon.co.uk)
Hayes ESP8 (8 port)
(pre-ALPHA driver, contact Dennis Boylan, dennis@lan.com)
Omega COMM-8 (8 port)
(contact Vance Petree, vpetree@infi.net)
Specialix SIO - (modular, 4 - 32 port)
(ALPHA driver, contact Simon Allen, simonallen@cix.compulink.co.uk)
Stallion EasyIO-4 (4 port), EasyIO-8 (8 port), and Stallion EasyConnection (modular, 8 - 32 port) (Cirrus Logic CD-1400 RISC UARTs), Stallion (8MHz 80186 processor - 8 or 16 port), Brumby (10 MHz 80186 processor - 4, 8 or 16 port), ONboard (16MHz 80186 processor - 4, 8, 12, 16 or 32 port), EasyConnection 8/64 (25MHz 80186 processor - modular, 8 - 64 port) (contact Greg Ungerer, gerg@stallion.oz.au or Stallion's Home Page . Driver Location: ftp.stallion.com:/drivers/ata5/Linux)

Drivers for the Cyclades, DigiBoard, and Specialix boards can be
found on sunsite.unc.edu:/pub/Linux/kernel/patches/serial and mirror sites.

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