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To: jw who wrote (6536)	2/23/1999 12:52:00 AM
From: Paul K	Read Replies (1) of 14778

Reference: PCI/ISA card Interrupts and IRQ Conflicts: pcguide.com I just found out how uncooperative a Mouse and CDROM SCSI card can be when they both share IRQ 12 <g> On this Abit BH6-2 it looks like I can free-up two IRQ's by turning off auto assignment of an IRQ to the USB bus (I don't have any USB devices yet) and it appears that on-board COM2 shares it's IRQ with the Infra-Red port (neither of which I need) so I could grab another one there if needed. (I'll need a few IRQ's for two NICs and at least a second video card) Users having problems getting multiple monitors to work may want to double check for video card IRQ conflicts. ============== IRQ by the Numbers: pcguide.com IRQ12 IRQ Number: 12 16-Bit Priority: 7 Bus Line: 16-bit only Typical Default Use: PS/2 mouse. Other Common Uses: Network cards, sound cards, SCSI host adapters, VGA video cards, tertiary IDE channel, PCI devices. Description: On machines that use a PS/2 mouse, this is the IRQ reserved for its use. Using a PS/2 mouse frees up the COM1 serial port and the interrupt it uses (IRQ4) for other devices. Normally this is a good trade since free IRQs with numbers below 8 are harder to find than ones above 8. If a PS/2 mouse is not used, IRQ12 is a good choice for use by other devices such as network cards. Conflicts: There are some potential problems here. Watch out for PCI cards that can sometimes be assigned this line by the system BIOS. This can be changed in some cases using the BIOS setup parameters that assign IRQs to PCI devices. If you are using a PS/2 mouse you need to make sure no other devices use IRQ12.

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