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Old 11 November 2009, 13:03   #1
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Mouse no horizontal movement - a1200

After having bought several a1200 mainboards on Ebay. I finally got one working.

On problem : the mouse does not move horizontally.
vertical ok, buttons ok
The mouse works with no problem on my a600
I replaced the mouseport on the a1200 with a new one (It is an a1200 with wired mouseport, not the fixed-on-the-mainboard one)

So far no luck...

Any suggestions ?
Old 11 November 2009, 15:13   #2

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Replace the mouse port ribbon cable from motherboard mouseport if your mobo uses that (mine does).
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Old 11 November 2009, 15:16   #3
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I replaced that ribbon cable already.
I sometimes got mouse movement with the new cable , thought it was fixed but...
The horizontal movement died again
Old 11 November 2009, 18:39   #4

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Tried with another mouse? If it's the same problem then, perhaps you need to replace a chip. Could be bad contact in the mouse port too ofc.
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Old 11 November 2009, 21:12   #5
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The mouse cable might also be broken.
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Old 11 November 2009, 23:33   #6

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Yeah, at least for PC it usually affects the point where the cable goes into the mouse, you can try to cut off 10cm and solder it to the right points inside the mouse. But if you can, try with a known working mouse so you know where the problem is! Or try the mouse in another Amiga, if it works then the mouse is okay ofc.
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Old 12 November 2009, 10:00   #7
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The mouse works in my a600

The mouseport in the a1200 was replaced by a new one

problem remains
Old 12 November 2009, 12:34   #8
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Faulty capacitors could be pulling down the supply voltage to the CIA chip that controls horizontal movement. The fact that you say that it occasionally works would support this. I would be looking to replace the capacitors as it's not an expensive fix and they will die eventually anyway.
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Old 13 November 2009, 07:57   #9
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Seems like a logical explanation.

I will have to boost my (de)soldering skills

Thank you

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