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Real time clock

Posted on 1998-10-18
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Last Modified: 2013-12-16
I have a customer's PC which gives a Interupt controller fault in the norton diagnostic program.
Interupt Controller : IRQ not available from Real Time Clock.

Setting up win95 results in page fault errors when booting.
After a while win95 comes up anyway and gives an error in the PnP-BIOS-expansion card.

I adviced the customer to change the motherboard or to buy a new one (it's a on 'old' Pentium 100).

I have two questions :
1. Any other suggestion then changing the motherboard ?
2. What does the Interupt Controller do and what is the consequence of not receiving IRQ's from the real time clock ?

Thx.

Peter.
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Question by:petevdb
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11 Comments
 
LVL 2

Expert Comment

by:gikam
ID: 1758799
Real time clock uses IRQ8
Most likely u have another device (lika a PnP pard installed on IRQ8)
check it

0
 
LVL 1

Author Comment

by:petevdb
ID: 1758800
I do not have an "extra" card installed. If it installed it is embedded on the motherboard and how do I check that ? How do specify the IRQ's of the motherboard by the way ? Can I change that ?
Peter.
0
 
LVL 2

Expert Comment

by:elc_music
ID: 1758801
You CAN assign an IRQ line to your cards.
(but only if they are EISA, PCI are PnP=Plug And PRAY :-) and that is not realy a joke you know)
that is in the BIOS PnP (if you have it, you said its an 'old' 100 board)
but if you get a Faulty IRQ controller, than it is a GOOD advice to throw away the old board. (and brake it so that I wont have to type this answer again..... :-)
But try another diagnostic like Pc tools or similer. If they ALL say the same then you know what to do.
also, look in 95's Conrol panel > system > Device man > SYSTEM DEVICES that there are NO " ! " marks and no "?" marks.
if so, try installing the needed drivers like Bus masterring, UDMA etc' (you didnt specify the board type)
a good trick (in most cases work well) is REMOOVE pci bus in sys devices, when promted to reboot click OK and re boot about a dozen times (New hardwre found .....Installing)
and IF the board is OK every thing SHOULD now be installed properly.
(you do have the 95 CD-rom dont you ? you'l need it for this one.)
ELC.
P.s
:-) = Smile, get it?
0
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Expert Comment

by:gikam
ID: 1758802
depends on your BIOS setup choices
U can check the IRQs like that:
Control Panel>System>Device manager>Computer>Properties>Interrupt request
0
 
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Expert Comment

by:elc_music
ID: 1758803
Dear gikam,
I could not find such items as "computer " in "Device manager"
assuming it should be "System devices > System CMOS/Real time clock > Properties" ?
or maybe your talking about win 98 ?
ELC.
0
 
LVL 2

Expert Comment

by:gikam
ID: 1758804
"Computer" is the first item in the Device manager list!
look carefully
I have win95osr2
0
 
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Expert Comment

by:elc_music
ID: 1758805
Thanks gikam.
I'v never tried to open this one.
Great summery of the Pc.
Great quik  view.

THANKS.
ELC.
0
 
LVL 2

Expert Comment

by:gikam
ID: 1758806
elc_music,
u are welcome,
but petevdb?
0
 
LVL 1

Author Comment

by:petevdb
ID: 1758807
Phwww, I've been off the net some time and it's been a nice discussion, I notice.
elc_music : It is indeed a great summery of the PC but it's besides the question. My question is 'what does the interupt controller do' and 'how is it possible that the computer works anyway if he doesn't receive any IRQ from the real time clock ??'
Gikam is probably right when the IRQ of the PnP extension is on the same IRQ as the real time clock. There is a '!' mentioned on the PnP extension card in the win95 settings (like I mention in my question, elc_music).
Anyway we trew away the motherboard so the problem will not occur anymore. I was just wandering what this interupt controller does ?
Peter.
0
 
LVL 2

Accepted Solution

by:
elc_music earned 200 total points
ID: 1758808
My dear friend.
The IRQ is as it's name, Intrrupt request.
mining, the piece of harware want to call the CPU and signal it for 1 of 2 things.
1. Hey Mr. CPU I ready to receive some data, Please send NOW.
2. HEY, Mr. CPU, I'm ready to TRANSMIT you data, Please be kined and receive it NOW.
well, in general, more or less, this is the IRQ.
so you sea, whan 2 devices are using the SAME IRQ, the CPU doean't know WHO is asking for data or who is sending data.
The result go's one way.
SYSTEM CRASH !!!!
now you know why.

now. as for for your NEW board,
PLEASE.
after installing apiece of harware as basic as the BOARD,
you MUST do 1 of 2 things. (again)
1. re install 95.
OR
2. use my trick. (and i'l give to you even for 50 pts.)
go in to Control panel > System > Device man. > System devices > PCI BUS.
now click REMOOVE, yes, Reboot.
95 will probebly boot a dozen of times installing an installing and.....
Ok.
Now your NEW board SHOULD be installed properly. (but I cant promise..)
just to be SURE, Check that thre are NO !! or ??
ELC.
0
 
LVL 2

Expert Comment

by:elc_music
ID: 1758809
OH DEAR ME,
I forgot a VERY important comment.
in the PCI enviroment, the concept is a little different.
because 2 PCI (and ONLY 2 PCI) cards CAN share the same IRQ line.
BUT ONLY 2 PCI CARDS.
but one of them MUST be a "master" (scsi cards must be in the master slot)
mining, Priority for IRQ usage.
BUT
no PCI & Eisa, no 2 Eisa can share the SAME IRQ line.
ELC.
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