24 January 2018, 09:09 | #1 |
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Join Date: May 2017
Location: Bremerton, USA
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Amiga 2000 with Flaky Controller Ports: Help Needed
My A2000's controller ports aren't working properly. The mouse does not track in port 1, but both mouse buttons work. A joystick plugged into port two has no response on the y-axis, though both the x-axis and fire button work.
What components on a rev. 6 motherboard are the likely culprits? I have already ruled out Paula and the CIA chips by swapping in known good chips. |
24 January 2018, 09:30 | #2 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,911
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Check that port 1 gets 5V in the Vcc pin and then check/swap U202
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24 January 2018, 21:32 | #3 |
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Location: Wild South / Germany
Age: 48
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Sometimes it's even more simple: Check the ports themselves for broken pin-to-mainboard connections. I had this with an A2000 Rev. 6 with the mouse port - one of the connections inside the 9-pin d-sub connector was broken and caused the x-axis (or maybe the y-axis, cannot remember) not to work.
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31 January 2018, 16:24 | #4 |
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So, a quick update! The problem has been found, and I jerry-rigged a workaround. There is this fuse (component labeled F1) on the +5V line going to the ports. Said fuse was blown. My work-around was to short across the fuse, and make a note to not touch the controller ports while power is being supplied to the Amiga.
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31 January 2018, 16:26 | #5 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,911
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The classic problem. Do you have all directions in both ports now though?
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31 January 2018, 17:18 | #6 |
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Join Date: May 2017
Location: Bremerton, USA
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Yup, the mouse works fine, and the joystick problem was due to my SEGA Genesis pad not wanting to go into the socket firmly. An extension cable fixed that.
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31 January 2018, 18:42 | #7 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
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Good to hear.
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