PB6 - PCBs

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JAMMA version

Revision:2018.08.08 K5891


PB6 Motherboard - Arcade


  • The H3 CPU can support up to 2GB ram.
  • There are two RAM slots on the motherboard, but only one is used.
  • The CGA signal seems generated in two steps: HDMI to VGA/CGA (bootX ?), then amplified/filtered (U7 to U15 pins 1-3).
  • The ATMLH830 eeprom (2KB) seems to be used to store the settings.
  • The 12V seems to be used only for the Audio amplifier stage (JAMMA pin 6 to TDA2003L pin 5) and the fan power supply.
  • You can switch on the Pandora Box Jamma by powering it only with the 5V.

BUT /!\ Careful: don't do that at home. The 12V fan is not powered, you could seriously damage the PCB/CPU. A (bad) solution can be to put the 5V on the 12V, this will allow the fan to be powered.

PB6 Jamma 5V.jpg

How to


H3 processor pinouts

H3 processor pinouts


Pb6 user inputs.png