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A Breakoutboard For The C64 Expansion Port
I thought, it would be nice to be able to access the expansion port signals, while a cartridge is inserted. This would be quite helpful for debugging a cartrdge with a scope or logic analyzer. Further, it would be nice to be able to disable some of the chip selects, interrupts and control signals, too.

Those are:
● /IO1
● /IO2
● /IRQ
● /NMI
● /DMA
The signals are jumpered. Pulling the jumper is disabling them. There is also +5V and GND on this jumper. Theoretically, it would be possible to manipulate the signals with a micro controller/arduino for analyzing a cartridge.

The box connector allows to access all signals on the C64 side. Further, this can serve for breadboarding a cartridge.

Cart64out Rev. 0

Cart64out in situ, with standoffs as a mechanical support

Cart64out Rev. 1

Cart64out Rev. 1 assembled

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