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Current status of PicoGUS (2022-08-28):

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

✅ Design prototype PCB
✅ Source parts & build prototype PCB
✅ Create ISA bus interface code in PIO
✅ Copy over GUS emulation code from sw/ directory and adapt to PIO programming model
✅ Implement port-only emulation of GUS
✅ Optimize GUS emulation to achieve 14 channels at 44.1KHz audio output
✅ Speed up PSRAM access to be fast enough for GUS sample playback
✅ Implement IRQs
✅ Implement sample upload via DMA
✅ Design release candidate PCB
📝 Fabricate and test release candidate PCB
📝 Better IRQ support
📝 Better DMA support
📝 Implement MPU-401 emulation and MIDI out on Pico UART

The current version of the board design is what I'd consider a "release candidate". I have not fabricated it yet so there may still be required hardware changes. Produce boards at your own risk!

Compatibility

Compatibility of various demos, trackers, players, and games are at the Compatibility list page.