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Home » Forums » Forum Archives » Other Computer Problems » Topic # 43

Loss of mouse and keyboard input
Stevelee Aug-20-00 08:52 PM
Hi all.
For a while now my PC has been plagued with a sudden loss of input from mouse and keyboard on occasions.
The only thing that I could do when it happened was to reset the machine.
Both peripherals were running on PS2 ports on an Abit BH6 board.
By a process of trial and error, I am now using a serial mouse and a USB keyboard and, fingers crossed, things seem to be running OK now.
( After I swapped just the mouse to a serial one, I thought I had cracked it, but then the keyboard started locking up again
With the current setup, I haven't had a loss of input for several days now.
What I would like to ask is this - has anyone any ideas how I can find out what the problem with my PS2 ports was?
Best Regards,
Steve Lee.

1. RE: Loss of mouse and keyboard input
lbyard Aug-21-00 03:55 PM
In response to message 0
I presume your computer is locking up (and that you are not overclocking)... That is, pressing Ctrl-Alt Delete once does not bring-up the Task Manager. Does the reset button work after it locks-up? Most anything can cause this problem and most of the time it is an IRQ conflict or bad memory. Rarely is it an keyboard problem--although static electricity can lock-up keyboards. Sometimes it is an IRQ conflict with the mouse. A serial mouse usually uses COM1:, IRQ 4 and a PS/2 mouse uses IRQ 12. Larry

2. RE: Loss of mouse and keyboard input
Stevelee Aug-21-00 09:06 PM
In response to message 1
Hi Larry.
Yes, that's right - it is locking up and does not respond to a '3 fingered salute' or anything else keyboard wise.
No, I am not overclocking at all.
Prior to putting the serial mouse on, the only way I could do anything was to press the reset button. At least now I can close it down or restart properly, using the mouse, when the keyboard locks me out.
Does the keyboard use an IRQ?
I was interested to note that a PS2 mouse uses IRQ12 - does that apply to a PS2 keyboard as well?
According to SiSoft's Sandra, my IRQ12 is being used as 'IRQ Holder for PCI Steering', whatever that means. It is also in use by my SoundBlaster Audio PCI64V soundcard.
I have been trying to find someone with a USB keyboard that I can borrow for a while, to see if avoiding the PS2 ports altogether eliminates the problem. However, they don't seem to be too common at the moment.
Is there a way that I can check out the bad memory possibility at all?
I'd appreciate any other thoughts that you might have.
Best Regards,
Steve.

3. RE: Loss of mouse and keyboard input
lbyard Aug-21-00 09:22 PM
In response to message 2
If the reset switch works the motherboard is not locking up—the BIOS is still running--and you probably do not have a motherboard/memory problem. The keyboard uses IRQ 1. I recently published the start of an IRQ FAQ (http://duxcw.com/faq/irq/irq.htm). It lists the commonly used IRQs. IRQ steering means that IRQ12 is being shared Via Windows. In my experience, it is not a good idea to share a soundboard IRQs. I would pull the soundboard for a while and see if the problems go away. Larry

4. RE: Loss of mouse and keyboard input
Stevelee Aug-22-00 06:16 AM
In response to message 3
Thanks, Larry.
I'l give it a try as soon as I can.
Cheers,
Steve.

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