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January 03, 2008

Reader Challenge for January 2008 and December 2007 Reader Challenge Winners

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December 2007 Reader Challenge Winners

Congratulations to the winners of our December 2007 Reader Challenge. First prize, a copy of “Windows Vista in a Nutshell,” goes to Dan Nease, of Oregon. Second prize, a copy of “Windows Vista: The Definitive Guide,” goes to Thomas C. Doyle, Jr., of South Carolina. Both books are from O'Reilly Media (www.ora.com).

January 2008 Reader Challenge

Solve this month's Vista Update challenge, and you might win a prize! Email your solution (don't use an attachment) to challenge@windowsitpro.com by Jan.10, 2008. You MUST include your full name, street mailing address (no P.O. Boxes), and a telephone number. Without that information, we can't send you a prize if you win, so your answer is eliminated, even if it’s correct. I choose winners at random from the pool of correct entries. I’m a sucker for humor and originality, and a cleverly written correct answer gets an extra chance. Because I receive so many entries each month, I can't reply to respondents, and I never respond to a request for an email receipt. Look for the solutions to this month's problem at http://www.windowsitpro.com/articles/index.cfm?articleid=97922 on Jan. 11, 2008.

The January 2008 Challenge:

Over the years of writing for “Windows IT Pro” magazine I've referred to functions and techniques I used as a consultant in the years before Windows networking was popular (or available). These articles always produce many nostalgic, often amusing, email messages from readers who are almost as old as I am. So, since the beginning of a new year invokes the vision of Father Time (in this case, Mother Time), this challenge should be easy for those of us who call ourselves "old timers."

In the old days, IRQs were a major headache when setting up computers for a network. When you installed a NIC, you often had to change its jumpers to assign a different IRQ, to make sure you didn't interfere with another device on the computer. Today, thanks to PCI and APCI technology, multiple devices can share IRQs and we almost never have to think about them, so we don't have to get out the tweezers and move jumpers. (I can remember asking clients if I could open computers that were being discarded, so I could get the jumpers. I'd store them in little pill jars, which provided the replacements I needed when the jumper I was changing dropped and got lost in the rug, or skidded across the floor and disappeared.) How much do you know (or remember) about IRQs?

Question #1: How many IRQs exist in a PC?

A. 12
B. 15
C. 21

Question #2: Which of the following device types does not use an IRQ

A. SCSI
B. Video
C. Keyboard

Question #3: If you need additional IRQs to install additional devices, which of the following statements represents the correct method?

A. You can add a second processor that is designed to provide additional IRQs.
B. You can buy a multi-media device that has its own set of unique IRQs.
C. You're out of luck, you can't add IRQs.

Here are the answers!

1: B
2: A
3: C
Good job, everyone!

End of Article



Reader Comments
#1 None of the above. There are 16 IRQs, IRQ0-IRQ15
#2 B video but that is not completely trrue as some old ega/vga cards used 2 & 11
#3 C - out of luck.

Leightym January 03, 2008 (Article Rating: )


#1 None of the above. Any APIC-enabled computer (any modern one) supports up to 255 IRQs. My Linux workstation reveals that IRQ 22 is assigned to ICH2.
#2 Video, but that's not entirely true, as Leightym said.
#3 With 255 IRQs, you will rarely have any problems.

felipe.alfaro January 03, 2008 (Article Rating: )


#1 - Answer B. There are 15 IRQs.
#2 - Answer A.
#3 - Answer B.

OldChap January 03, 2008 (Article Rating: )


#1 - C. Less than 16 can be controlled in the BIOS settings, but there's more in use on the board so I guess the answer is 21.
#2 - B. But in some cases you did assign an IRQ to a VGA card.
#3 - C. I guess if you plug in another board it can have interrupts for its own use, but they don't extend the motherboard IRQs.

As to the last paragraph, not sure the problem has gone away at all. Very recently I had to pull a new NIC because of a hardware conflict with a multimedia card. In fact whenever I start filling up the slots of a PC something breaks. Recommended solution is to swap cards around, but that can be extremely frustrating and time consuming. Give me a motherboard with pretty much everything on it and I know I won't have to worry about IRQs.

lancea January 04, 2008 (Article Rating: )


Question #1:
There are 16 IRQs, however only 15 are availble for use due to the addtion of 8 IRQs and one original being reserved for uplink from the original 8 to ones added on, so 15 would be the answer for this question.
B. 15

Question #2: While it is true the very old video cards needed an IRQ assigned to them, it is the video that does not use an IRQ.
B. Video

Question #3: You cannot add system IRQs, so you are out of luck.
C. You're out of luck, you can't add IRQs.

pmuscato@rocketmail.com January 04, 2008 (Article Rating: )


Great feedback, guys! You ARE aware that you can email your answers to Kathy and possibly get a free book and your name in print, right?

Caroline from editorial January 04, 2008 (Article Rating: )


Now I am :-) But looks like we're all agreed that it's not possible to give the answers we think are correct, without qualification. It's just like sitting a Microsoft exam (but for free)!

lancea January 04, 2008 (Article Rating: )


And less painful!

Caroline from editorial January 04, 2008 (Article Rating: )


As I blow the dust off my old brown brief case, roll the tumblers to the correct combination, click click both side unlock, as I open the top, low & behold theirs my Little " Gerber Jar Of Jumpers"
#1: B 15 IRQ's
#2: B AS everyone has commented it's not always true
"A second processor" You guy's must have been privy to the Super Secret Squirrel club" that was a dream back in the days!
#3: C Your SOL! "Sorry I'm an old timer"

Mikes283 January 07, 2008 (Article Rating: )


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