feat: add 10 emulator profiles (batch 2)

a5200, prosystem (Atari 7800), atari800 (400/800/XL/XE),
vice (C64/C128/VIC-20/Plus4/PET - 10 cores, all ROMs embedded),
neocd (Neo Geo CD, 12 BIOS variants), beetle_pce (PC Engine, 6 files),
beetle_pcfx (PC-FX), np2kai (PC-9801, 14 files + YM2608 samples),
quasi88 (PC-8801, 13 ROMs + 3 hidden fonts), opera (3DO, 10 BIOS + 3 kanji)

31 total profiles. Cross-reference: 572 undeclared, 148 in repo.

emulators/neocd.yml

@@ -0,0 +1,141 @@
+emulator: NeoCD
+type: libretro
+source: "https://github.com/libretro/neocd_libretro"
+systems:
+  - snk-neogeo-cd
+
+notes: |
+  NeoCD is a dedicated SNK Neo Geo CD emulator. It supports Front Loader,
+  Top Loader, and CDZ hardware variants. BIOS files go in {system_dir}/neocd/
+  subdirectory (src/path.cpp:7, src/libretro_bios.cpp:76-81).
+
+  The core scans the neocd/ directory for any .rom or .bin file (also inside
+  .zip archives), reads the first 512 bytes, and identifies the BIOS type by
+  binary pattern matching at fixed ROM addresses (src/bios.cpp:168-208).
+  Filenames listed in the .info are conventional but not enforced by the core.
+
+  Three hardware families are detected: Front Loader (NeoCD), Top Loader
+  (NeoCD), and CDZ. Modified BIOS variants are also recognized: SMKDan 0.07,
+  SMKDan 0.07b, Universe BIOS 3.2, and Universe BIOS 3.3. The core applies
+  speed hack patches and CD recognition patches at load time for each type
+  (src/bios.cpp:209-280).
+
+  The Y-ZOOM ROM (ng-lo.rom / 000-lo.lo) is a sprite zoom lookup table loaded
+  separately (src/memory.h:22, YZOOMROM_SIZE = 0x10000 = 65536 bytes). It is
+  optional but improves sprite scaling accuracy.
+
+  All firmware entries are marked optional in the .info (any single valid BIOS
+  is sufficient). The core presents detected BIOSes as a dropdown in the core
+  options menu, sorted alphabetically by description.
+
+  BIOS ROM size: 524288 bytes (0x80000, src/memory.h:16).
+  Y-ZOOM ROM size: 65536 bytes (0x10000, src/memory.h:22).
+
+files:
+  # Front Loader BIOS (NeoCD original front-loading unit)
+  - name: neocd_f.rom
+    dest: neocd/neocd_f.rom
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "Front Loader BIOS, official NeoCD format"
+    source_ref: "retroarch/libneocd_libretro.info:15 (firmware0)"
+
+  # Front Loader BIOS, SMKDan custom
+  - name: neocd_sf.rom
+    dest: neocd/neocd_sf.rom
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "Front Loader BIOS, SMKDan custom"
+    source_ref: "retroarch/libneocd_libretro.info:18 (firmware1)"
+
+  # Top Loader BIOS (NeoCD top-loading unit)
+  - name: neocd_t.rom
+    dest: neocd/neocd_t.rom
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "Top Loader BIOS, official NeoCD format"
+    source_ref: "retroarch/libneocd_libretro.info:21 (firmware2)"
+
+  # Top Loader BIOS, SMKDan custom
+  - name: neocd_st.rom
+    dest: neocd/neocd_st.rom
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "Top Loader BIOS, SMKDan custom"
+    source_ref: "retroarch/libneocd_libretro.info:24 (firmware3)"
+
+  # CDZ BIOS (Neo Geo CDZ, last revision)
+  - name: neocd_z.rom
+    dest: neocd/neocd_z.rom
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "CDZ BIOS, official NeoCD format"
+    source_ref: "retroarch/libneocd_libretro.info:27 (firmware4)"
+
+  # CDZ BIOS, SMKDan custom
+  - name: neocd_sz.rom
+    dest: neocd/neocd_sz.rom
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "CDZ BIOS, SMKDan custom"
+    source_ref: "retroarch/libneocd_libretro.info:30 (firmware5)"
+
+  # Y-ZOOM ROM (sprite zoom lookup table)
+  - name: ng-lo.rom
+    dest: neocd/ng-lo.rom
+    system: snk-neogeo-cd
+    required: false
+    size: 65536
+    note: "Y-ZOOM ROM, NeoCD format"
+    source_ref: "retroarch/libneocd_libretro.info:33 (firmware6)"
+
+  # Y-ZOOM ROM, MAME naming
+  - name: 000-lo.lo
+    dest: neocd/000-lo.lo
+    system: snk-neogeo-cd
+    required: false
+    size: 65536
+    note: "Y-ZOOM ROM, MAME naming (same content as ng-lo.rom)"
+    source_ref: "retroarch/libneocd_libretro.info:36 (firmware7)"
+
+  # Front Loader BIOS, MAME naming
+  - name: front-sp1.bin
+    dest: neocd/front-sp1.bin
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "Front Loader BIOS, MAME naming (same content as neocd_f.rom)"
+    source_ref: "retroarch/libneocd_libretro.info:39 (firmware8)"
+
+  # Top Loader BIOS, MAME naming
+  - name: top-sp1.bin
+    dest: neocd/top-sp1.bin
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "Top Loader BIOS, MAME naming (same content as neocd_t.rom)"
+    source_ref: "retroarch/libneocd_libretro.info:42 (firmware9)"
+
+  # CDZ BIOS, MAME naming
+  - name: neocd.bin
+    dest: neocd/neocd.bin
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "CDZ BIOS, MAME naming (same content as neocd_z.rom)"
+    source_ref: "retroarch/libneocd_libretro.info:45 (firmware10)"
+
+  # Universe BIOS for CD systems
+  - name: uni-bioscd.rom
+    dest: neocd/uni-bioscd.rom
+    system: snk-neogeo-cd
+    required: false
+    size: 524288
+    note: "Universe BIOS CD, third-party multi-region BIOS (hack)"
+    source_ref: "retroarch/libneocd_libretro.info:48 (firmware11)"