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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: beller on February 26, 2009, 03:27:25 AM

Title: Amiga 1000 Mouse Dead
Post by: beller on February 26, 2009, 03:27:25 AM

I picked up a dust-bin sale A1000 last year and finally got around to tearing it down to clean it today.  When I tested it last year it worked fine, though given the amount of crud inside the drive I wonder why.  The inside was full of carbon colored soot!

I took it apart and cleaned it, washed the case etc.  Put it back together and it booted right up.  However, the mouse is non-responsive.  I've used two know good mice to be sure.

The right button does generate a menu but it doesn't register movement...

Suggestions?

Title: Re: Amiga 1000 Mouse Dead
Post by: amigadave on February 26, 2009, 04:47:13 AM

Check to make sure both CIA chips are seated, in fact check all the socketed chips to make sure they are pushed all the way down (without putting too much pressure on the motherboard to damage it).  If all chips are seated well, replace the CIA chips with new ones, one at a time with a test in between each replacement, so you can narrow down which CIA chip has gone bad, if indeed that is the problem.  I would have also suggested that there is a fuse on most Amigas that protects the mouse/joystick ports, but I am guessing that the fuse is still good since you are getting menus when the right mouse button is pushed down.

Another possible problem would be the mouse port pins.  One of them could be broken off and missing.

Title: Re: Amiga 1000 Mouse Dead
Post by: CLS2086 on February 26, 2009, 08:35:11 PM

Hi,
check the mouse socket and tracks around it

Title: Re: Amiga 1000 Mouse Dead
Post by: beller on February 26, 2009, 11:32:11 PM

Thanks for the suggestions!  I've been looking around the net and, I think, I need to look at the grounding on my drive.   I think it might be the cause of it.  Won't get around to tearing back into it until the weekend...

Title: Re: Amiga 1000 Mouse Dead
Post by: JimS on February 27, 2009, 12:19:10 AM

The buttons are just switch closures... no power is needed for them. The motion is a different matter. You need the 5V to power the electronics in the mouse. You can check between the middle two pins of the bottom row of the mouseport, if you have a meter. Just be careful that you don't short it out with the probes.

Title: Re: Amiga 1000 Mouse Dead
Post by: beller on March 08, 2009, 12:04:30 AM

Finally got back to the A1000 this afternoon to see why the mouse quit.  As I suspected, I had grounded the drive on a bad spot.

First, I've learned never remove the ground wire from the A1000 motherboard!  Take it off the drive!

When I reassembled the A1000 booted and everything is working great!  I'm running the Electronic Arts Polyscope demo for a bit just to make sure nothing smokes!

Thanks again for the tips, lucky it was simple user error!

Bob