Jack wrote: > OK, so I am assuming that your board containing com3 and com4 is using > the > standard IRQ. This would mean: > > 1. Radio, CW, and one rotor are all trying to use same IRQ4 ( com1 > and com3 > share an IRQ ). > 2. Rotor two is ok.. no IRQ3 conflicts. > > I would try putting your second rotor on Com4 instead of Com3. See if > that > helps any. This would result in > > radio and cw on Com1/IRQ4 > rotor 1 on com2/IRQ3 > rotor 2 on Com4/IRQ3 > spare com3/IRQ4 > > > Jack...there is a lot of confusion regarding IRQ's and sharing. In the 'old days' cards were ISA bus and the sharing of IRQ's was difficult to impossible in Windows. With the transition to PCI it's quite possible to share IRQ's, although early PCI cards and drivers did this poorly, sometimes not at all. Sometimes you had to get into the registry and do some patching. With a current system and properly designed PCI cards and drivers sharing of IRQ's is not something you even have to give any thought to. It just works.
For example in my ham shack system, which is PCI only and modern, the old COM1 and COM2 still each require separate IRQ's and are not shared. Effectively com1 and com2 are still ISA devices. Until com ports are dropped altogether this will likely remain unchanged. However for add in cards (PCI) in my case I have 2 each of the Byterunner PCI 4 port cards. The resulting 8 ports all use IRQ 11, and IRQ 11 is also used for USB controller, Ethernet controller and Video controller. That's 11 devices which all share IRQ 11. All this occured without my doing anything special, its the default apparently. Len has told us that his cards is a dual port SIIG card, but we still do not know the model number, the vintage, if it is PCI or ISA, if he is using the latest driver for it etc We don't know what IRQ's his 2 high port com's indicate they are using, and if they are shared with other devices. I would be helpful to have complete information. I realize that he said it worked with DXB2002. But as I recall back in those days high com ports were often made to work by registry tricks. If I had to guess lacking most of the needed information I would suspect the card. But of course I could be wrong! I am sure glad all my IRQ problems are well behind me, I have had plenty of such problems in the past with earlier vintage cards. Ron, N5IN
