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Page: Jumper Settings
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Jumper Settings
Giorgioggì edited this page 2020-04-18 15:21:23 +02:00
  • JP1: If opened, disables the Power-Up Reset (Default: Closed).
  • JP2: Chooses whether Agnus pin 59 is connected to A19 (Middle + Bottom, Default) or A23 (Middle + Top). This has to do with the trapdoor memory being mapped to Chip or Fast RAM, but more info is needed.
  • JP3: Swaps upper and lower RAM banks (Default: Horizontal).
  • JP4A/B: Bypasses U32 for 512K system (Default: Open).
  • JP7A: Allows connecting the /EXTICK signal to pin 32 of the Trapdoor Connector (Middle + Right). Can also be used to permanently grounds /EXTICK (Middle + Left), no idea why (Default: Fully open).
  • JP7B: Chooses the timer source for the Odd CIA (U7): /VSYNC (Moddle + Left, Default) or /EXTICK (Middle + Right).
  • JP8: Allows switching the Light Pen Button from the Joystick Port (Middle + Left, Default) to the Mouse Port (Middle + Right).
  • JP9: If closed, disables the internal Real-Time Clock (Default: Open).
  • JP10A: If opened, the AUDIN (Audio In) signal from pin 18 of the Serial Port does not get mixed into the right audio channel.
  • JP10B: If opened, the AUDOUT (Audio Out, essentially the left audio channel) signal is disconnected from pin 11 of the Serial Port.
  • JP11: Chooses whether the Composite Sync signal going to pin 10 of the Video connector is the raw BLANK signal (Middle + Bottom, Default) or a version of it that gets amplified by the Video Hybrid (Middle + Top).