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Rough plan of experimentation/implementation:

✅ = done, 📝 = work in progress, 💭 = still to be done

✅ Design prototype PCB, with level shifters and lines for IRQ and DMA
📝 Source parts & build prototype PCB
💭 Run RPiISA code on Linux on prototype PCB, validating level shifters, changing design/bodging as needed
💭 Port RPiISA code to Circle, using PWM audio out
💭 Extract GUS emulation code from DOSBox
💭 Implement port-only emulation
💭 Implement IRQs
💭 Implement sample upload via DMA
💭 Investigate moving GPIOs to free up I2S pins for better audio output quality via external DAC
💭 Design release candidate PCB