emulator: Beetle NGP (Mednafen Neo Geo Pocket)
type: libretro
source: "https://github.com/libretro/beetle-ngp-libretro"
profiled_date: "2026-03-18"
core_version: "v0.9.36.1"
display_name: "SNK - Neo Geo Pocket / Color (Beetle NeoPop)"
systems: [snk-ngp, snk-ngpc]

notes: |
  Beetle NGP is a fork of Mednafen's NeoPop module for Neo Geo Pocket
  and Neo Geo Pocket Color emulation via libretro.

  No external BIOS or firmware files are required. The core uses a
  built-in High-Level Emulation (HLE) BIOS that is constructed at
  runtime by bios_install() in mednafen/ngp/bios.c.

  The HLE BIOS populates a 64KB array (ngpc_bios[0x10000]) with:
  - A system call vector table at 0xFE00 (27 entries covering
    clock, RTC, interrupts, font, flash read/write, comms)
  - Each vector target contains an iBIOSHLE instruction (opcode 0x1F)
    that traps into biosHLE.c for high-level handling
  - A built-in system font (2048 bytes at 0x8DCF)
  - A default interrupt handler (RETI at 0x23DF)
  - An infinite loop at 0xFFFE as the idle entry point

  The TLCS-900h CPU (main) and Z80 (sound) are both emulated in
  software. Flash memory for game saves is handled internally via
  flash.c without needing a separate firmware dump.

  The only core option is ngp_language (english/japanese), which
  controls the language flag passed to games. It does not affect
  BIOS loading.

  ROM extensions: .ngp, .ngc, .ngpc, .npc

files: []