17 March 2024, 17:12 | #1 |
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The chip that manages the Joystick port
HI
With A500 it happens that while I'm playing, every now and then the Joystick doesn't respond to the right direction command. I disassembled the Joystick, checked the connections and cleaned the relevant directional contacts. Usual flaw. Could it be a problem with the CIA chip? Exactly what would be the CIA that manages the Joystick port? |
17 March 2024, 17:21 | #2 |
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If it's an old microswitch joystick then those switches will eventually worn out and needs to be replaced. I would look into that first.
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17 March 2024, 17:39 | #3 |
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Maybe a faulty 74LS157 on U15 (If you are sure the joysticks are ok) ?
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17 March 2024, 18:01 | #4 |
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I agree with the other answers , this more likely to be a switch or cable problem than an amiga fault . Can you try with another joystick ? Have you got a multimeter that you can test it with ?
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17 March 2024, 19:18 | #5 |
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Paula manage directions and CIA's fire button.
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17 March 2024, 21:03 | #6 |
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Paula only manages the pots / buttons 2 and 3. The directions are handled by Denise (Lisa on AGA machines) via the '157 multiplexer ('166 shift register on AGA machines), but if it is a fault on the motherboard and not a simple bad connection on the port, in my experience it's usually either the multiplexer / shift register or the passives associated with those signals that fail.
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18 March 2024, 11:11 | #7 | |
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Quote:
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18 March 2024, 11:58 | #8 |
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I was wondering. If it were Denise who was missing, wouldn't she just always be missing the right directional control?
However I try to control the Joystick better. |
18 March 2024, 14:18 | #9 |
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If the mouse works ok in every direction, Denise should be fine.
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19 March 2024, 16:36 | #10 |
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actually the mouse works well in every direction.
I really think that the fault is to be found in the joystick. |
19 March 2024, 17:03 | #11 |
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What joystick is it? I echo the sentiment that it is probably the joystick at fault here.
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