Show HN: Three genlocked RP2350B make a console – 3k sprite pixels per line)

papyDeck is a compact, openly designed game console that treats every game as an editable Lua folder on a micro‑SD card: main.lua plus assets, no compilation, no locked blobs. A sandboxed virtual machine runs on the board and in a browser simulator that is bit‑for‑bit identical, so edits saved in a file take effect the next frame and runtime errors print line numbers rather than crashing the system. Development requires no toolchain or cable; published games can be fetched over Wi‑Fi and opened on the device to inspect and modify their source. Licences are chosen (hardware under CERN‑OHL‑P, firmware under MIT) and repositories will be opened when the V1 board is finalized.

The hardware is a 60×60 mm V1 alpha board built from three genlocked RP2350B chips providing HDMI 640×480@60, six Cortex‑M33 cores and about 3,000 opaque sprite‑pixels per scanline (measured on the bench, roughly twice Neo Geo), plus a scrolling tile layer with no tearing by design. The alpha board, running since 26 August 2026, shows sprites, tilemaps, Wi‑Fi, Bluetooth gamepads, micro‑SD game loading, four‑channel music and sampled effects, headphone output, and over‑the‑air firmware updates; remaining work includes HDMI audio, a verified leaderboard and final V1 board items (voltage supervisor and secure element). Nothing is for sale and there is no release date; documentation covers firmware architecture, hardware decisions and measured figures.