This ISA card, discovered inside an Amiga 2000, is most likely a PC game port interface designed for analog joysticks.
Several features support this conclusion:
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It has two female, two-row DB15 connectors – a common layout for PC joystick/gameport cards.
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The presence of a trimmer potentiometer suggests it was designed to be calibrated to the PC’s CPU or bus frequency, a typical requirement for analog input devices.
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On the top side of the 8-bit ISA connector, 10 address lines are connected, giving the card access to I/O addresses from 0x0000 to 0x02FF.
Notably, standard PC game ports are mapped to I/O address range 0x0200–0x020F.
Taken together, these characteristics strongly indicate that this card is a standard PC-compatible game port controller.
(Admin Comment: This is an ISA 8-bit edge connector PCB, and the rear rotary switch has the markings for popular ISA clock frequencies - Robert Miranda)