Hi Dave:
The Byterunner Dual Serial PCI cards allow assigning a different
IRQ to each serial port and I have successfully used them with CT.
(No connection with Byterunner but a satisfied customer). Their
DOS "driver", VSEMUIO, allows setting the IRQ for each port
separately. I have not tried the four-port serial cards.
These are the ones I use. I even take such a card to VY2TT
just for temporary DOS use...
73,
Mark
David Pruett wrote:
>
> -------- Original Message --------
> Subject: Re: [CQ-Contest] Any CT DOS Experts out there
> Date: Wed, 13 Jun 2007 19:42:27 -0400
> From: David Pruett <k8cc@comcast.net>
> To: N6KI Dennis Vernacchia <n6ki_73@sbcglobal.net>
> References: <466FB553.3060204@sbcglobal.net>
>
>
>
> Dennis,
>
> I have yet to see a PCI dual COM port card be able to use both ports to
> DOS programs such as CT or NA. I suspect that this is an IRQ issue.
> Most of these cards have a single IRQ shared between both ports, but CT
> (actually its COMTSR driver) and NA are both designed to have separate
> IRQs for each port. This cannot be solved in the COMTSR setup; its a
> function of the hardware design, and hence the driver as well (which
> does the low level work to make a PCI card look somewhat like an ISA
> card to the DOS-based program).
>
> I've never had any issues getting DOS software to interface with a PCI
> card with a single COM port and the DOS driver. I have a pair of old
> Acer Pentium 200 desktops with a built in COM1, a COM2 hooked to a
> hidden modem interface (which I cannot seem to locate on the
> motherboard), and a single-COM PCI card as COM3. COM1 goes to the
> serial port network, and COM3 to the radio. Works FB with both CT-DOS
> and NA.
>
> One observation (which might not apply to your situation, but is related
> to the topic) is a problem using IRQ2. On the PC motherboard, there are
> one or two IRQ controller chips, each of which control up to 8 different
> IRQs. Very old PCs (pre-286) only had one chip, and so could only
> handle IRQ0 thru IRQ7. IRQ0 and IRQ1 are used by the operating system
> itself, while IRQ6 is used by the floppy drive. With the advent of
> 80286 and later PCs, a second IRQ controller chip was added, giving
> eight additional IRQs; IRQ8 thru IRQ15. According to the documentation
> I have, IRQ8 is the clock/calendar, IRQ13 is the math co-processor and
> IRQ14 is the fixed disk drive.
>
> The problem comes that the output of the second IRQ controller is
> daisy-chained to the first controller through IRQ2. Without boring
> anyone more than necessary, when an IRQ8-IRQ15 occurs, the 2nd chip
> signals the first through IRQ2 which causes the 1st chip to signal the
> CPU, and somehow the operating system figures out which IRQ really occurred.
>
> The reason I bring this up is that I've had ISA COM cards which I've set
> the dip switches for IRQ2, which could work in one computer, but not in
> another (both being 80386 or better machines) with my application
> program (CT or NA) set for IRQ2. When IRQ2 in the software doesn't
> work, setting the software for IRQ9 (but the card for IRQ2) usually
> works. This appears to be related to how the BIOS maps the IRQs from
> the 2nd chip, and apparently not all BIOSes work the same.
>
> I apologize if I've bored anyone with all of this IRQ junk...
>
> 73,
>
> Dave/K8CC
>
> N6KI Dennis Vernacchia wrote:
>> I did post this Query on CT Reflector but thought
>> I'd cover my bases in case someone here knows answer
>>
>> I have a Celeron machine running DOS/WIN98SE
>> I am trying to get CT Ver 10.003 set up for a ham friend
>>
>> Problem is it only has 1 COM port on Mother Board
>> and I need 2, 1 for Telnet Packet ands 1 for Radio Control
>> ( Using Printer Port to key rig for CW - that works fine )
>>
>>
>> I managed to find a NEW 2 COM Port ( 2 DB-9s connectors)
>> PCI board which I installed and the floppy disk that came with it
>> had drivers for DOS and also WIN98
>>
>> I did check the company's web site for any new drivers
>> and the DOS and WIN98 drivers were the same as on the diskette
>>
>> Machine is set to boot into Straight DOS without
>> loading any Windows Driver
>> ( set GUI=0 in System.ini file )
>>
>> That works fine, it boots into DOS on turn on
>>
>> I installed the card and DOS driver and I am able to
>> do a port test with a DOS Utility and both COM ports
>> checkout fine.
>>
>> In the CT Directory I load
>> COMTSR1 ( For my Telnet Packet input and that works fine )
>>
>> I am trying to do radio control for a
>> Kenwood TS-950 on one of the new ports on the
>> Plug in serial card
>>
>> I typed
>>
>> COMTSRX -A2E8 -B4800
>> ( Where X = 2, 3 and 4 com ports.....to no avail)
>>
>> Any ideas what I am doing wrong
>>
>> The Blue confirmation Window always comes up and verifies that
>> I did in fact get the desired COM port and the port address
>>
>> ( The Serial card booklet instructed me that port addresses
>> are 2E8 and 3E8
>>
>> ( N81 for other defaults as usual )
>>
>> I also went into WIN 98 and loaded those drivers just to be sure
>> WIN98 sees the ports and all is well there but I know not
>> to run CT for DOS in WIN98
>>
>> I do NOT want to run CTWIN if I can help it as have
>> had too many problems in the past with Video chipsets etc
>> not working correct with CTWIN )
>>
>> Ant DOS gurus out there with some other solutions ?
>>
>> 73, Dennis N6KI
>> Sandy Eggo
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>>
>>
>>
>
>
>
>
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