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Isa pnp bus

Trish's Escape from Hardware Hell Help Board » Software » All Other Software » Isa pnp bus « Previous Next »

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Shaun Barnes
Posted on Monday, May 8, 2000 - 12:11 pm:   

win98/system info/problem devices states that the isa pnp bus is faulty,i extracted isapnp.vxd but this didnot cure it, could this be why my system is unstable and why my pc 'loses' the modem and/or com ports sometimes?. this problem remains despite a re-partition/format !

all help greatly appreaciated :-)
Danny Albers
Posted on Monday, May 8, 2000 - 6:34 pm:   

Have you installed all the drivers that came with your motherboard? Better yet, check for updated drivers.

Try changing the bios setting for Plug and Play OS to no. Just see what happens. You can always change it back. Sometimes this assists older ISA devices, even if they are plug and play.

As well, you may have an IRQ conflict, check and see.
shaun barnes
Posted on Monday, May 8, 2000 - 11:22 pm:   

had the mb replaced by my all forgiving dealer,bios is on non pnp, modem & vga are on irq 5 but no probs shown in system properties,my card is a 2d/3d tnt2 agp and dosent like anything installed in the first pci slot, is that normal?
Danny Albers
Posted on Tuesday, May 9, 2000 - 1:24 pm:   

OK, tell me the make and model of you modem. Modems should not be on IRQ 5, period, the should be on IRQ 4 (if com3) and IRQ 3 (if com4), also tell me exactly what the settings are for your com ports in both windows device manager AND in the BIOS.

We are getting somewhere

Once again tell me the

*BIOS and Device manager settings for the com ports.
*The make and model of modem
*Many sound cards also use IRQ 5, check to see if yours does
*Check your modem and tell me what COM port it uses, this is found in the device manager
*See if you can disable VGA use IRQ in the bios, some BIOS's have this

BTW, you should be able to use the first PCI slot.

Thanks, a solution is close here friend.
shaun barnes
Posted on Wednesday, May 10, 2000 - 2:24 pm:   

ok danny,
com1 -in/out 03f8-03ff
interupt 04
8 data bits
parity none
stop bits 1
flow xon/xoff
com2 - as com1 except
in/out 02f8-02ff
interupt 03
modem - rockwell hcf 56k pci modem on com3
sound - yamaha qs3000a chipset on irq 10
yes i can disable vga use irq in bios

hope this helps!.........shaun
Danny Albers
Posted on Wednesday, May 10, 2000 - 3:25 pm:   

OK, I just re-read your earlier message about having replaced the mainboard. I had missed the part about no-longer having errors reported by your device manager, so I assume that the ISA pnp problem is solved. Let me know if I am wrong.

Your modem is set up correctly as Rockwells seem to prefer to set on COM 3, but I personally think these are cheap, crappy modems and have had my share of trouble with them. They always seemed to setup and run well for a while, then start to die of in either speed, or the disconnect alot. Since I switched to a different brand of modems for my clients, I have had no more modem problems. Creative Labs modem blasters, cheap and extremly good.

If your modem and Com ports are still being 'lost' I would try disabling COM 1, and if you use a standard mouse, then disable COM 2 and make the current COM 1 into COM 2. Might work as COM 1 and COM 3 both use IRQ 4, although IRQ sharing is supposed to work this out, its not perfect.

As far as your first PCI slot being unusable, in some bioses you can individually assign the IRQ address to each physical slot, maybe the slot is in conflict, try chaning its assigned IRQ. Its about the only thing you can do. I wouldnt bother unless you really need to slot though. Usually the PCI slot you cannot use is the one shared with an ISA slot (the one closest to the ISA) and then only if the ISA slot next to it is being used.

It is kind of difficult trying to trouble-shoot long distance like this. All I can do is share my experience with you and hope it helps you out. I have built over 500 hundred computers in the past 2 years, so I have had my share of similar experiences to the ones you are describing. Good luck, and let me know if any of this has helped.

Just curious, what brand and model of mainboard and what CPU are you running. There are some mainbaords I consider 'crappy' and I just wanna see if you happen to own of them. :)

Good luck
shaun barnes
Posted on Thursday, May 11, 2000 - 10:38 am:   

danny, the mobo is a fic va503+ with a amd k6/2 350
i changed the bios 'assign irq for vga ' to disable , this put it on irq11 but it dident help.

I have removed all my peripherals and cards but the vga and unpartioned/reformated , then installed win 98 and i still have this 'isa pnp bus'device falure message. what could be causing this?
i really aprieciate you taking the time to help me with this , my local dealer has given up after he relised i wasen't going to throw any more money at it vainly hoping it would cure it!
many thanks.........shaun
Posted on Thursday, May 11, 2000 - 12:38 pm:   

Just a little input...I have experienced the not liking PCI slot 1 next to the AGP card. There was absolutely no way my video card would allow my NIC card to be there without really unpredictable and mysterious problems. When I finally moved it to the other end, the ISA shared next to an internal modem, all problems were gone. However, in one of my little "need to know" sessions, and not sure how many or what config changes in between...I put the NIC card back to slot1 by the AGP slot...and have not seen any problems. AND my NIC and AGP cards now share IRQ 10. That was out of the question before.

Here's something that has many times solved IRQ and PNP problems for me:

In device manager...system devices...PCI bus...settings, change from use hardware to use BIOS or visa versa. Usually when problems were solved, it was originally set to use hardware.

Did you run the system file checker in system info?

Do you have the latest BIOS update?

Your particular modem tends to have quite a few problems. You can get more info on it at

Maybe something here will help.

Just a few thoughts.
shaun barnes
Posted on Friday, May 12, 2000 - 10:53 am:   

hello trish,
tried setting pci bus to bios ,unfortuantly no change,my motherboard is using the latest bios availiable and the system file checker reports no errors.
i have removed all the pci cards(inc modem) and the error still remains.the only hardware devices that i can't rule out are the hard drive and cpu , neither of which could be causing the error i suppose
shaun barnes
Posted on Monday, May 15, 2000 - 10:26 am:   

stop press,
just had a chat with my dealer and happened to say about the dissapearing com ports , aparantly he's had four fic 503+ mobo's do the same thing,
anyway he agreed to swap it for a gigabyte board and problem solved!.
thanks to you both for taking the time to answer my prob.

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