mig@cunixb.cc.columbia.edu (Meir) (06/13/91)
In article <1991Jun10.153842.12545@midway.uchicago.edu> valley@gsbsun.uchicago.edu (Doug Dougherty) writes: >hanj@bronze.ucs.indiana.edu (Jining Han) writes: > > > >>I have a very standard 286 (AMI bios), with 2 parallel ports and >>2 serial ports. The problem is, when I put a modem in, one of the >>serial ports is disabled (com1 if I set modem to use com1 or com3, >>com2 if I set modem to use com2 or com4). > >You have to disable one of the on-board serial ports when you install an >internal modem. Else you end up with two devices trying to be the same >COM port. (I.e., I think the thing you don't realize is that the >internal modem has a built-in serial port) Is the situation with a bus mouse similar? Specifically, is there an advantage to getting a motherboard which includes a PS/2 style mouse port, and is there any effective difference between this type of port, a bus-mouse, and a serial mouse? Do they use the same interrups? * * * * * * ====================== Meir Green * * * * * * ====================== (Internet) mig@cunixb.cc.columbia.edu * * * * * * ====================== meir@msb.com mig@asteroids.cs.columbia.edu * * * * * * ====================== (Amateur Radio) N2JPG
sorrow@oak.circa.ufl.edu (06/13/91)
I have two serial ports and just installed a Logitech MouseMan. Not a problem at all. Modems and COM ports fight over addresses, whereas a bus mouse creates its own (yeah, yeah, simplistic but close enough). Anything that needs COM port when installed or when software is run (such as a modem, digitizer, external mouse, etc.) can cause problems. Bus mice tend to be fairly automatic with installation (no need to say which com port, since they don't use one.) Brian /* Brian Hook -- MS-DOS Programmer for Contract ----------------------------------------------------------------- "I was in the kitchen, Seamus, that's my dog, was outside....and buried ALIVE....fritter and waste...but this one goes to 11!....anymore of that plutonium nyborg?...Little guitars..This is home...this is Mean Street.. */
jsims@vuse.vanderbilt.edu (J. Robert Sims) (06/14/91)
In article <0094A069.21705FC0@MAPLE.CIRCA.UFL.EDU> sorrow@oak.circa.ufl.edu writes: >I have two serial ports and just installed a Logitech MouseMan. Not >a problem at all. Modems and COM ports fight over addresses, whereas >a bus mouse creates its own (yeah, yeah, simplistic but close enough). > >Anything that needs COM port when installed or when software is run (such >as a modem, digitizer, external mouse, etc.) can cause problems. > >Bus mice tend to be fairly automatic with installation (no need to say >which com port, since they don't use one.) > >Brian >/* >Brian Hook -- MS-DOS Programmer for Contract >----------------------------------------------------------------- >"I was in the kitchen, Seamus, that's my dog, was outside....and buried >ALIVE....fritter and waste...but this one goes to 11!....anymore of that >plutonium nyborg?...Little guitars..This is home...this is Mean Street.. >*/ This isn't quite accurate. Bus mice use interrupts. Sometimes you have an available interrupt (such as 5), but if you have a network card or second parallel port, etc. it is likely that you don't have any free interrupts. So, the interrupt setting on the mouse card works best on... Interrupts 3 and 4! Sure it conflicts with the serial ports! (but not as badly as the mouse would conflict with an ethernet card, scanner, whatever). This interrupt sharing should not be a problem, except that most mouse drivers are very unfriendly about sharing. Rob