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17 March 2024, 17:12
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#1 |
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Registered User
Join Date: Jan 2023
Location: Italia
Posts: 200
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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? |
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17 March 2024, 17:21
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#2 |
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Registered User
Join Date: Jan 2019
Location: Finland
Posts: 635
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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
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#3 |
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Registered User
Join Date: Jan 2016
Location: Germany
Posts: 328
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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
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#4 |
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Registered User
Join Date: Dec 2022
Location: MILTON KEYNES
Posts: 70
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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
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#5 |
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Registered User
Join Date: Jun 2010
Location: PL?
Posts: 2,766
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Paula manage directions and CIA's fire button.
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17 March 2024, 21:03
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#6 |
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Registered User
Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 6,343
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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
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#7 | |
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Registered User
Join Date: Jun 2010
Location: PL?
Posts: 2,766
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Quote:
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18 March 2024, 11:58
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#8 |
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Registered User
Join Date: Jan 2023
Location: Italia
Posts: 200
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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. |
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18 March 2024, 14:18
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#9 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,863
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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
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#10 |
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Registered User
Join Date: Jan 2023
Location: Italia
Posts: 200
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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. |
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19 March 2024, 17:03
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#11 |
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Registered User
Join Date: May 2001
Location: ?
Posts: 19,645
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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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