kthompso@uceng.UC.EDU (ken thompson) (08/21/89)
A friend of mine recently took his PC AT clone back to the clone shop for warranty repair. He was told that he would have to buy a new mother board. The owner said he damaged it by having two cards set to the same interrupt, IRQ 4. This PC also had a hard disk failure a couple of weeks earlier and the replacement hard disk was also cooked with the mother board. Now this guy won't give back the PC, not even the cards in it that were not purchased there. He says he may need it for evidence. I say that IRQs did not cause this. More likely an over voltage condition by the power supply. The mother board IRQ chip is just a TTL input waiting for a high. What does it care how many highs are put on the IRQ line. I could see where the conflicting cards could blow out one another but not the mother board. I have tried this myself on an XT. The only problem was with software not working correctly. My friend has a lawyer working on this but how does he prove that IRQs did not blow up his mother board and two hard disk? Any suggestions will be greatly appreciated. Thanks in advance. -- Ken Thompson University of Cincinnati Dept. of Chemical Eng. kthompso@uceng.uc.edu