[DXBase] Com Port problems

2003年4月28日 09:02:04 -0500

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