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  Nomad Core v1.0.0 Stable

  CyfrowyNomada released this 2026-10-09 16:57:20 +02:00 | 0 commits to master since this release

  Nomad Core v1.0.0

  First release that renders exported P1XEL projects correctly end to end.

  Fixed

  • Background tiles did not render. The BG map byte conversion
    ((CHR + 128) & $FF) was the inverse of what signed $8800 LCDC
    addressing does; every exported cell pointed at the empty CHR range. Now
    byte = CHR & $FF in the exporter (P1XEL >= 4.2), the engine font path
    and P1XEL-CONTRACT.md. Re-export existing projects with the updated
    P1XEL.
  • Input dead on BGB/hardware. Boot RAM is random there; game state was
    never cleared, so the popup router swallowed all input. EngineInit now
    zeroes all of WRAM0.

  Engine

  • abi.rgbinc: single engine/game ABI header; catalogc no longer mirrors
    constants by hand.
  • Popup window on the hardware Window layer: camera-independent, dirty-flag
    VRAM writes, no save/restore strip.
  • LevelLoad: bank-correct addressing for up to 255 levels, field clamping,
    camera reset, EngineFatal red screen on bad data.
  • Shared CameraClamp, VideoBGMapBase; entity slot masking.
  • Macros: OnTileGoto, Despawn, PADF_* masks, edge-triggered menus,
    dpad repeat.
  • Reserved blank tile (CHR 383 / BG slot 255), zero-filled by the exporter.

  Showcase game

  Title (text, flipped frame tiles, palettes, static OAM, menu) -> 32x32
  scrolling maze (solid tiles, P1XEL spawn markers, hunting enemy, camera,
  pause popup, exit meta-tile) -> Win; About; Dead/RETRY. Regenerate the
  project with python tools/sample/make_sample.py.

  Tests

  tools/test/selftest.py boots with scribbled RAM and asserts VRAM map
  bytes, CHR contents, window text, SCX/SCY and OAM (46 checks).

  Assets

  • the-game-boy-engine.gbc - CGB ROM (MBC5 + RAM + battery)
  • project.p1x - the showcase project for P1XEL
  • the-game-boy-engine.sym - symbols for BGB / debugging

  Downloads

  • Source code (ZIP)
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  • Source code (TAR.GZ)
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  ---

  • project.p1x
    0 downloads · 2026-10-09 16:57:58 +02:00 · 18 KiB
  • the-game-boy-engine.gbc
    0 downloads · 2026-10-09 16:57:58 +02:00 · 32 KiB
  • the-game-boy-engine.sym
    0 downloads · 2026-10-09 16:57:58 +02:00 · 7 KiB