Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!sdd.hp.com!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!kth.se!ugle.unit.no!ugle!thoger From: thoger@solan.unit.no (Terje Th|gersen) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: ATI VGA Wonder MOUSE + Two Serial Ports: Possible? Message-ID: Date: 1 Feb 91 23:06:33 GMT References: <2194@njitgw.njit.edu> Sender: news@ugle.unit.no Organization: The Norwegian Institute of Technology Lines: 44 In-Reply-To: cd5340@mars.njit.edu's message of 31 Jan 91 18:58:29 GMT In article <2194@njitgw.njit.edu> cd5340@mars.njit.edu (Charlap) writes: Well, here is the list of the interrupts used by systems, as they pertain to mice: INT Do not use for a mouse if you have a ---- --------------------------------------------------------- 5 An IBM PC or PC/XT with a hard disk (or an AT with an XT hard disk controller) 4 Serial ports COM1: or COM3: 3 Serial ports COM2: or COM4: 2 An IBM PC/AT, an EGA card, or a network adapter Needless to say, if you have 2 serial ports, an XT hard drive controller and an EGA card, you can't use a mouse without conflict. You'd have to use a serial mouse on one of your COM ports or disable a COM port. --- Dave (cd5340@mars.njit.edu) About using IRQ2 in an AT.. I'm using a 386sx, with 2 COM-ports using IRQ4 and 3, a network adapter using IRQ5, and a bus-mouse on the net-adapter that's set for IRQ2. The mouse is *not* used/installed. In spite of this, I'm able to get a RS485-card set as IRQ2 to work nicely. I didn't think it would work, but decided to give it a try, since all other IRQ's were busy and ebabled. So, as far as I can tell, you *can* use IRQ2 in an AT, although this is just connected to the second 8359A, and it's possible for two devices to share the same IRQ, as long as only one of the devices has interrupts enabled. What bothers me a bit is *why* this works.. I thought the IRQ2 line was reserved for that second PIC.. Oh, what the heck.. it works.. -Terje -- ____________________________________________________________________________ thoger@solan.unit.no | Institute of Physical Chemistry THOGER AT NORUNIT.BITNET | Div. of Computer Assisted Instrumental Analysis | Norwegian Institute of Technology