Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!chinacat!chip From: chip@chinacat.Unicom.COM (Chip Rosenthal) Newsgroups: comp.unix.questions Subject: Re: serial ports Message-ID: <1965@chinacat.Unicom.COM> Date: 27 Apr 91 10:17:29 GMT References: Organization: Unicom Systems Development, Austin, TX Lines: 19 In article cary.lewis@rose.uucp (CARY LEWIS) writes: > When you install a second board (for the third and possibly >fourth serial port) you share an interrupt with the first board, but >use different IO ports. No I don't. Interrupt signals on a peecee are active logic, not wired or. If you try to put multiple peripherals on a single IRQ you create bus contention. You can throw as many dumb COM ports into the system you'd like, as long as you have unique interrupts and i/o addresses for each. SCO configures in only the first two COM ports - the rest you need to add yourself. -- Chip Rosenthal 512-482-8260 | Unicom Systems Development | I saw Elvis in my wtmp file. |