emulator: PCem
type: libretro
source: "https://github.com/libretro/libretro-pcem"
profiled_date: "2026-03-18"
core_version: "SVN"
display_name: "PC (PCem)"
systems: [ibm-pc, ibm-xt, ibm-at, ibm-pcjr, ibm-ps1, tandy-1000]

# PCem (PC Emulator) emulates IBM PC compatibles from 8088 through Pentium.
# All ROMs are loaded relative to the core's system directory via romfopen()
# which prepends pcempath (= RetroArch system dir) to the path.
# Each machine model requires its own BIOS ROM set under roms/<machine>/.
# Video card ROMs are separate and only needed for the selected GPU.
# The font ROM (mda.rom) is always loaded at startup.

files:
  # ========================================================
  # FONT ROM (always loaded)
  # ========================================================
  - name: "MDA font ROM"
    path: "mda.rom"
    required: true
    note: >
      MDA/Hercules character generator ROM. Loaded unconditionally by loadbios()
      via loadfont() at startup, regardless of selected video card.
    source_ref: "src/mem.c:107"

  # ========================================================
  # XT-IDE BIOS (optional, loaded for XT-class machines)
  # ========================================================
  - name: "XT-IDE BIOS"
    path: "roms/ide_xt.bin"
    required: false
    note: >
      XT-IDE Universal BIOS for XT-class machines. Loaded as option ROM at
      0xC8000. Used by IBM PC, IBM XT, Generic XT, DTK XT, AMI XT,
      Tandy, Amstrad, Euro PC, Olivetti, PC2086, PC3086, and other XT clones.
    source_ref: "src/mem.c:60-72"

  - name: "AT-IDE BIOS"
    path: "roms/ide_at.bin"
    required: false
    note: >
      XT-IDE Universal BIOS for AT-class machines. Loaded as option ROM.
      Used by IBM AT, Compaq Deskpro 386, Phoenix 386, DTK 386.
    source_ref: "src/mem.c:74-86"

  - name: "AT-IDE BIOS v1.1.5"
    path: "roms/ide_at_1_1_5.bin"
    required: false
    note: >
      XT-IDE Universal BIOS v1.1.5 for AT-class machines.
      Used specifically by IBM PS/1 model 2011.
    source_ref: "src/mem.c:88-100"

  # ========================================================
  # MACHINE BIOS ROMs - IBM
  # ========================================================
  - name: "IBM PC BIOS"
    path: "roms/ibmpc/pc102782.bin"
    required: false
    note: "IBM 5150 PC BIOS dated 10/27/82 (8 KB)."
    source_ref: "src/mem.c:382-386"

  - name: "IBM PC BASIC C1.1 F6"
    path: "roms/ibmpc/basicc11.f6"
    required: false
    note: "IBM Cassette BASIC C1.1 ROM, bank F6. Optional for IBM PC."
    source_ref: "src/mem.c:387-388"

  - name: "IBM PC BASIC C1.1 F8"
    path: "roms/ibmpc/basicc11.f8"
    required: false
    note: "IBM Cassette BASIC C1.1 ROM, bank F8."
    source_ref: "src/mem.c:391-393"

  - name: "IBM PC BASIC C1.1 FA"
    path: "roms/ibmpc/basicc11.fa"
    required: false
    note: "IBM Cassette BASIC C1.1 ROM, bank FA."
    source_ref: "src/mem.c:395-397"

  - name: "IBM PC BASIC C1.1 FC"
    path: "roms/ibmpc/basicc11.fc"
    required: false
    note: "IBM Cassette BASIC C1.1 ROM, bank FC."
    source_ref: "src/mem.c:399-401"

  - name: "IBM XT BIOS (combined)"
    path: "roms/ibmxt/xt.rom"
    required: false
    note: >
      IBM 5160 XT BIOS (64 KB combined ROM). Fallback: if this file
      is missing, the core tries the split ROMs 5000027.u19 + 1501512.u18.
    source_ref: "src/mem.c:203-222"

  - name: "IBM XT BIOS U19"
    path: "roms/ibmxt/5000027.u19"
    required: false
    note: "IBM XT BIOS low chip. Used when xt.rom is not present."
    source_ref: "src/mem.c:206"

  - name: "IBM XT BIOS U18"
    path: "roms/ibmxt/1501512.u18"
    required: false
    note: "IBM XT BIOS high chip. Used when xt.rom is not present."
    source_ref: "src/mem.c:207"

  - name: "IBM PCjr BIOS"
    path: "roms/ibmpcjr/bios.rom"
    required: false
    note: "IBM PCjr BIOS (64 KB). Required for PCjr machine model."
    source_ref: "src/mem.c:226-229"

  - name: "IBM AT BIOS U27"
    path: "roms/ibmat/62x0820.u27"
    required: false
    note: "IBM 5170 AT BIOS low chip. Paired with 62x0821.u47."
    source_ref: "src/mem.c:299"

  - name: "IBM AT BIOS U47"
    path: "roms/ibmat/62x0821.u47"
    required: false
    note: "IBM 5170 AT BIOS high chip. Paired with 62x0820.u27."
    source_ref: "src/mem.c:300"

  - name: "IBM PS/1 model 2011 BIOS"
    path: "roms/ibmps1es/f80000.bin"
    required: false
    note: >
      IBM PS/1 model 2011 BIOS (128 KB). 64 KB is read from offset 0x60000.
      Also loaded separately by PS/1 motherboard init as a high ROM at 0xF80000.
    source_ref: "src/mem.c:513-517, src/ps1.c:127-128"

  # ========================================================
  # MACHINE BIOS ROMs - Tandy
  # ========================================================
  - name: "Tandy 1000 BIOS"
    path: "roms/tandy/tandy1t1.020"
    required: false
    note: "Tandy 1000 BIOS v01.020 (64 KB)."
    source_ref: "src/mem.c:165-168"

  - name: "Tandy 1000 HX BIOS"
    path: "roms/tandy1000hx/v020000.u12"
    required: false
    note: "Tandy 1000 HX BIOS (128 KB)."
    source_ref: "src/mem.c:172-176"

  - name: "Tandy 1000 SL/2 BIOS low"
    path: "roms/tandy1000sl2/8079047.hu1"
    required: false
    note: "Tandy 1000 SL/2 BIOS low chip. Paired with 8079048.hu2."
    source_ref: "src/mem.c:180"

  - name: "Tandy 1000 SL/2 BIOS high"
    path: "roms/tandy1000sl2/8079048.hu2"
    required: false
    note: "Tandy 1000 SL/2 BIOS high chip. Paired with 8079047.hu1."
    source_ref: "src/mem.c:181"

  # ========================================================
  # MACHINE BIOS ROMs - Amstrad / Sinclair
  # ========================================================
  - name: "Amstrad PC1512 BIOS low"
    path: "roms/pc1512/40043.v1"
    required: false
    note: "Amstrad PC1512 BIOS low chip."
    source_ref: "src/mem.c:121"

  - name: "Amstrad PC1512 BIOS high"
    path: "roms/pc1512/40044.v1"
    required: false
    note: "Amstrad PC1512 BIOS high chip."
    source_ref: "src/mem.c:122"

  - name: "Amstrad PC1512 font ROM"
    path: "roms/pc1512/40078.ic127"
    required: false
    note: "Amstrad PC1512 character generator ROM."
    source_ref: "src/mem.c:132"

  - name: "Amstrad PC1640 BIOS low"
    path: "roms/pc1640/40044.v3"
    required: false
    note: "Amstrad PC1640 BIOS low chip."
    source_ref: "src/mem.c:135"

  - name: "Amstrad PC1640 BIOS high"
    path: "roms/pc1640/40043.v3"
    required: false
    note: "Amstrad PC1640 BIOS high chip."
    source_ref: "src/mem.c:136"

  - name: "Amstrad PC1640 video BIOS"
    path: "roms/pc1640/40100"
    required: false
    note: "Amstrad PC1640 built-in EGA video BIOS. Also used by vid_pc1640 device."
    source_ref: "src/mem.c:145, src/vid_pc1640.c:124"

  - name: "Sinclair PC200 BIOS high"
    path: "roms/pc200/pc20v2.1"
    required: false
    note: "Sinclair PC200 BIOS high chip."
    source_ref: "src/mem.c:151"

  - name: "Sinclair PC200 BIOS low"
    path: "roms/pc200/pc20v2.0"
    required: false
    note: "Sinclair PC200 BIOS low chip."
    source_ref: "src/mem.c:152"

  - name: "Sinclair PC200 font ROM"
    path: "roms/pc200/40109.bin"
    required: false
    note: "Sinclair PC200 character generator ROM."
    source_ref: "src/mem.c:162"

  - name: "Amstrad PC2086 BIOS low"
    path: "roms/pc2086/40179.ic129"
    required: false
    note: "Amstrad PC2086 BIOS low chip."
    source_ref: "src/mem.c:261"

  - name: "Amstrad PC2086 BIOS high"
    path: "roms/pc2086/40180.ic132"
    required: false
    note: "Amstrad PC2086 BIOS high chip."
    source_ref: "src/mem.c:262"

  - name: "Amstrad PC2086 video BIOS"
    path: "roms/pc2086/40186.ic171"
    required: false
    note: "Amstrad PC2086 Paradise PVGA1A video BIOS."
    source_ref: "src/mem.c:273, src/vid_paradise.c:329"

  - name: "Amstrad PC3086 BIOS"
    path: "roms/pc3086/fc00.bin"
    required: false
    note: "Amstrad PC3086 system BIOS (16 KB)."
    source_ref: "src/mem.c:281"

  - name: "Amstrad PC3086 video BIOS"
    path: "roms/pc3086/c000.bin"
    required: false
    note: "Amstrad PC3086 Paradise PVGA1A video BIOS."
    source_ref: "src/mem.c:285, src/vid_paradise.c:338"

  # ========================================================
  # MACHINE BIOS ROMs - Other XT clones
  # ========================================================
  - name: "Generic XT BIOS"
    path: "roms/genxt/pcxt.rom"
    required: false
    note: "Generic XT clone BIOS (8 KB)."
    source_ref: "src/mem.c:233-236"

  - name: "DTK XT BIOS"
    path: "roms/dtk/DTK_ERSO_2.42_2764.bin"
    required: false
    note: "DTK XT clone BIOS (8 KB)."
    source_ref: "src/mem.c:240-243"

  - name: "AMI XT BIOS"
    path: "roms/amixt/AMI_8088_BIOS_31JAN89.BIN"
    required: false
    note: "AMI 8088 XT clone BIOS dated 31 Jan 1989 (8 KB)."
    source_ref: "src/mem.c:539-542"

  - name: "VTech Laser Turbo XT BIOS"
    path: "roms/ltxt/27C64.bin"
    required: false
    note: "VTech Laser Turbo XT BIOS (8 KB)."
    source_ref: "src/mem.c:547-550"

  - name: "VTech Laser XT3 BIOS"
    path: "roms/lxt3/27C64D.bin"
    required: false
    note: "VTech Laser XT3 BIOS (8 KB)."
    source_ref: "src/mem.c:555-558"

  - name: "Phoenix XT BIOS"
    path: "roms/pxxt/000p001.bin"
    required: false
    note: "Phoenix XT clone BIOS (8 KB)."
    source_ref: "src/mem.c:585-588"

  - name: "Juko PC BIOS"
    path: "roms/jukopc/000o001.bin"
    required: false
    note: "Juko XT clone BIOS (8 KB)."
    source_ref: "src/mem.c:593-596"

  - name: "Euro PC BIOS"
    path: "roms/europc/50145"
    required: false
    note: "Schneider Euro PC BIOS (32 KB)."
    source_ref: "src/mem.c:374-377"

  - name: "Olivetti M24 BIOS low"
    path: "roms/olivetti_m24/olivetti_m24_version_1.43_low.bin"
    required: false
    note: "Olivetti M24 BIOS low chip, version 1.43."
    source_ref: "src/mem.c:247"

  - name: "Olivetti M24 BIOS high"
    path: "roms/olivetti_m24/olivetti_m24_version_1.43_high.bin"
    required: false
    note: "Olivetti M24 BIOS high chip, version 1.43."
    source_ref: "src/mem.c:248"

  # ========================================================
  # MACHINE BIOS ROMs - 286 AT clones
  # ========================================================
  - name: "Commodore PC 30 III BIOS even"
    path: "roms/cmdpc30/commodore pc 30 iii even.bin"
    required: false
    note: "Commodore PC 30 III BIOS even chip."
    source_ref: "src/mem.c:312"

  - name: "Commodore PC 30 III BIOS odd"
    path: "roms/cmdpc30/commodore pc 30 iii odd.bin"
    required: false
    note: "Commodore PC 30 III BIOS odd chip."
    source_ref: "src/mem.c:313"

  - name: "AMI 286 BIOS"
    path: "roms/ami286/amic206.bin"
    required: false
    note: "AMI 286 clone BIOS (64 KB)."
    source_ref: "src/mem.c:365-368"

  - name: "Dell System 200 BIOS low"
    path: "roms/dells200/dell0.bin"
    required: false
    note: "Dell System 200 BIOS low chip."
    source_ref: "src/mem.c:326"

  - name: "Dell System 200 BIOS high"
    path: "roms/dells200/dell1.bin"
    required: false
    note: "Dell System 200 BIOS high chip."
    source_ref: "src/mem.c:327"

  # ========================================================
  # MACHINE BIOS ROMs - 386 machines
  # ========================================================
  - name: "Compaq Deskpro 386 BIOS U11"
    path: "roms/deskpro386/109592-005.U11.bin"
    required: false
    note: "Compaq Deskpro 386 BIOS low chip."
    source_ref: "src/mem.c:524"

  - name: "Compaq Deskpro 386 BIOS U13"
    path: "roms/deskpro386/109591-005.U13.bin"
    required: false
    note: "Compaq Deskpro 386 BIOS high chip."
    source_ref: "src/mem.c:525"

  - name: "Acer 386SX BIOS"
    path: "roms/acer386/acer386.bin"
    required: false
    note: "Acer 386SX/25N BIOS (64 KB). Also requires oti067.bin video ROM."
    source_ref: "src/mem.c:353-356"

  - name: "Acer 386SX OTI-067 video BIOS"
    path: "roms/acer386/oti067.bin"
    required: false
    note: "OTI-067 video BIOS for Acer 386SX (on-board video)."
    source_ref: "src/mem.c:359, src/vid_oti067.c:184"

  - name: "Phoenix 386 BIOS low"
    path: "roms/px386/3iip001l.bin"
    required: false
    note: "Phoenix 386 clone BIOS low chip."
    source_ref: "src/mem.c:563"

  - name: "Phoenix 386 BIOS high"
    path: "roms/px386/3iip001h.bin"
    required: false
    note: "Phoenix 386 clone BIOS high chip."
    source_ref: "src/mem.c:564"

  - name: "DTK 386 BIOS"
    path: "roms/dtk386/3cto001.bin"
    required: false
    note: "DTK 386SX clone BIOS with NEAT chipset (64 KB)."
    source_ref: "src/mem.c:577-580"

  - name: "Amstrad MegaPC BIOS low"
    path: "roms/megapc/41651-bios lo.u18"
    required: false
    note: "Amstrad MegaPC BIOS low chip."
    source_ref: "src/mem.c:407"

  - name: "Amstrad MegaPC BIOS high"
    path: "roms/megapc/211253-bios hi.u19"
    required: false
    note: "Amstrad MegaPC BIOS high chip."
    source_ref: "src/mem.c:408"

  - name: "AMI 386 BIOS"
    path: "roms/ami386/ami386.bin"
    required: false
    note: "AMI 386 clone BIOS with Headland/OPTi 82C495 chipset (64 KB)."
    source_ref: "src/mem.c:345-348"

  # ========================================================
  # MACHINE BIOS ROMs - 486 machines
  # ========================================================
  - name: "AMI 486 BIOS"
    path: "roms/ami486/ami486.BIN"
    required: false
    note: "AMI 486 clone BIOS with ALi M1429 chipset (64 KB)."
    source_ref: "src/mem.c:422-425"

  - name: "AMI WinBIOS 486"
    path: "roms/win486/ALI1429G.AMW"
    required: false
    note: "AMI WinBIOS 486 with ALi M1429G chipset (64 KB)."
    source_ref: "src/mem.c:431-434"

  - name: "HOT-433 PCI 486 BIOS"
    path: "roms/hot-433/hot-433.ami"
    required: false
    note: "HOT-433 PCI 486 BIOS with UMC UM8881F chipset (128 KB)."
    source_ref: "src/mem.c:439-443"

  - name: "DTK 486 BIOS"
    path: "roms/dtk486/4siw005.bin"
    required: false
    note: "DTK PKM-0038S E-2 BIOS with SiS 85C471 chipset (64 KB)."
    source_ref: "src/mem.c:601-604"

  - name: "Award SiS 496 BIOS"
    path: "roms/sis496/SIS496-1.AWA"
    required: false
    note: "Award BIOS for SiS 496/497 chipset (128 KB)."
    source_ref: "src/mem.c:448-452"

  - name: "Rise R418 BIOS"
    path: "roms/r418/r418i.bin"
    required: false
    note: "Rise Computer R418 BIOS with SiS 496/497 chipset (128 KB)."
    source_ref: "src/mem.c:608-612"

  # ========================================================
  # MACHINE BIOS ROMs - Pentium machines
  # ========================================================
  - name: "Intel Premiere/PCI (Batman) BIOS"
    path: "roms/revenge/1009AF2_.BIO"
    required: false
    note: "Intel Premiere/PCI BIOS (430LX, code-name Batman). Main BIOS block."
    source_ref: "src/mem.c:469-471"

  - name: "Intel Premiere/PCI (Batman) BIOS ext"
    path: "roms/revenge/1009AF2_.BI1"
    required: false
    note: "Intel Premiere/PCI BIOS extension block."
    source_ref: "src/mem.c:474-478"

  - name: "Intel Premiere/PCI II (Plato) BIOS"
    path: "roms/plato/1016AX1_.BIO"
    required: false
    note: "Intel Premiere/PCI II BIOS (430NX). Main BIOS block."
    source_ref: "src/mem.c:617-620"

  - name: "Intel Premiere/PCI II (Plato) BIOS ext"
    path: "roms/plato/1016AX1_.BI1"
    required: false
    note: "Intel Premiere/PCI II BIOS extension block."
    source_ref: "src/mem.c:622-625"

  - name: "Intel Advanced/EV (Endeavor) BIOS"
    path: "roms/endeavor/1006CB0_.BIO"
    required: false
    note: "Intel Advanced/EV BIOS (430FX). Main BIOS block."
    source_ref: "src/mem.c:483-485"

  - name: "Intel Advanced/EV (Endeavor) BIOS ext"
    path: "roms/endeavor/1006CB0_.BI1"
    required: false
    note: "Intel Advanced/EV BIOS extension block."
    source_ref: "src/mem.c:488-491"

  - name: "PC Partner MB500N BIOS"
    path: "roms/mb500n/031396S.BIN"
    required: false
    note: "PC Partner MB500N BIOS (430FX, Award, 128 KB)."
    source_ref: "src/mem.c:632-635"

  - name: "ASUS P/I-P54TP4XE BIOS"
    path: "roms/p54tp4xe/T15I0302.AWD"
    required: false
    note: "ASUS P/I-P54TP4XE BIOS (430FX, Award, 128 KB)."
    source_ref: "src/mem.c:640-643"

  - name: "Acer M3A BIOS"
    path: "roms/acerm3a/r01-b3.bin"
    required: false
    note: "Acer M3A BIOS (430HX, 128 KB)."
    source_ref: "src/mem.c:648-651"

  - name: "Acer V35N BIOS"
    path: "roms/acerv35n/V35ND1S1.BIN"
    required: false
    note: "Acer V35N BIOS (430HX, 128 KB)."
    source_ref: "src/mem.c:656-659"

  - name: "ASUS P/I-P55T2P4 BIOS"
    path: "roms/p55t2p4/0207_J2.BIN"
    required: false
    note: "ASUS P/I-P55T2P4 BIOS (430HX, Award, 128 KB)."
    source_ref: "src/mem.c:664-667"

  - name: "Award 430VX BIOS"
    path: "roms/430vx/55XWUQ0E.BIN"
    required: false
    note: "Award 430VX PCI BIOS (128 KB)."
    source_ref: "src/mem.c:459-463"

  - name: "Epox P55-VA BIOS"
    path: "roms/p55va/VA021297.BIN"
    required: false
    note: "Epox P55-VA BIOS (430VX, Award, 128 KB)."
    source_ref: "src/mem.c:672-675"

  # ========================================================
  # VIDEO CARD ROMs (selected via gfxcard option)
  # ========================================================
  - name: "IBM EGA BIOS"
    path: "roms/ibm_6277356_ega_card_u44_27128.bin"
    required: false
    note: "IBM EGA card BIOS (32 KB)."
    source_ref: "src/vid_ega.c:957, 1078"

  - name: "Compaq EGA BIOS"
    path: "roms/108281-001.bin"
    required: false
    note: "Compaq EGA card BIOS (32 KB)."
    source_ref: "src/vid_ega.c:997, 1083"

  - name: "Chips & Technologies SuperEGA BIOS"
    path: "roms/lega.vbi"
    required: false
    note: "Chips & Technologies SuperEGA BIOS (32 KB)."
    source_ref: "src/vid_ega.c:1041, 1088"

  - name: "IBM VGA BIOS"
    path: "roms/ibm_vga.bin"
    required: false
    note: "IBM VGA card BIOS. Also used by PS/1 VGA (same availability check)."
    source_ref: "src/vid_vga.c:89, 127"

  - name: "Compaq/Paradise VGA BIOS"
    path: "roms/1988-05-18.rom"
    required: false
    note: "Compaq/Paradise PVGA1A VGA BIOS dated 1988-05-18."
    source_ref: "src/vid_paradise.c:366, 373"

  - name: "ATI VGA Edge-16 BIOS"
    path: "roms/vgaedge16.vbi"
    required: false
    note: "ATI VGA Edge-16 (ATI-18800) video BIOS."
    source_ref: "src/vid_ati18800.c:135, 155"

  - name: "ATI VGA Charger BIOS"
    path: "roms/bios.bin"
    required: false
    note: "ATI VGA Charger (ATI-28800) video BIOS."
    source_ref: "src/vid_ati28800.c:160, 180"

  - name: "OAK OTI-067 BIOS"
    path: "roms/oti067/bios.bin"
    required: false
    note: "OAK OTI-067 standalone video BIOS."
    source_ref: "src/vid_oti067.c:158, 194"

  - name: "Trident TVGA8900D BIOS"
    path: "roms/TRIDENT.BIN"
    required: false
    note: "Trident TVGA8900D video BIOS."
    source_ref: "src/vid_tvga.c:292, 307"

  - name: "Tseng ET4000AX BIOS"
    path: "roms/et4000.BIN"
    required: false
    note: "Tseng ET4000AX video BIOS."
    source_ref: "src/vid_et4000.c:153, 168"

  - name: "Tseng ET4000/W32p BIOS"
    path: "roms/et4000w32.bin"
    required: false
    note: "Diamond Stealth 32 (Tseng ET4000/W32p) video BIOS."
    source_ref: "src/vid_et4000w32.c:1081, 1103"

  - name: "S3 Vision864 BIOS"
    path: "roms/bahamas64.BIN"
    required: false
    note: "Paradise Bahamas 64 (S3 Vision864) video BIOS."
    source_ref: "src/vid_s3.c:2001, 2015"

  - name: "S3 Trio64 BIOS (Number Nine 9FX)"
    path: "roms/s3_764.bin"
    required: false
    note: "Number Nine 9FX (S3 764/Trio64) video BIOS."
    source_ref: "src/vid_s3.c:2020, 2034"

  - name: "S3 Trio32 BIOS (Phoenix)"
    path: "roms/86C732P.bin"
    required: false
    note: "Phoenix S3 732/Trio32 video BIOS."
    source_ref: "src/vid_s3.c:2039, 2055"

  - name: "S3 Trio64 BIOS (Phoenix)"
    path: "roms/86c764x1.bin"
    required: false
    note: "Phoenix S3 764/Trio64 video BIOS."
    source_ref: "src/vid_s3.c:2060, 2076"

  - name: "S3 ViRGE BIOS"
    path: "roms/s3virge.bin"
    required: false
    note: "Diamond Stealth 3D 2000 (S3 ViRGE) video BIOS."
    source_ref: "src/vid_s3_virge.c:3746, 3936"

  - name: "S3 ViRGE/DX BIOS"
    path: "roms/86c375_1.bin"
    required: false
    note: "S3 ViRGE/DX (86C375) video BIOS."
    source_ref: "src/vid_s3_virge.c:3836, 3941"

  - name: "ATI Mach64 GX BIOS"
    path: "roms/mach64gx/bios.bin"
    required: false
    note: >
      ATI Graphics Pro Turbo (Mach64 GX) video BIOS. Also used by the
      Cirrus Logic CL-GD5429 init path (likely a copy/paste in the source).
    source_ref: "src/vid_ati_mach64.c:2341, src/vid_cirrus.c:2324"

  - name: "Cirrus Logic CL-GD5429 BIOS"
    path: "roms/5429.vbi"
    required: false
    note: "Cirrus Logic CL-GD5429 video BIOS."
    source_ref: "src/vid_cl5429.c:847, 872"

  - name: "Trident TGUI9440 BIOS"
    path: "roms/9440.vbi"
    required: false
    note: "Trident TGUI9440 video BIOS."
    source_ref: "src/vid_tgui9440.c:495, 517"

  - name: "Paradise WD90C11 BIOS"
    path: "roms/megapc/41651-bios lo.u18"
    required: false
    note: >
      Paradise WD90C11 video BIOS for MegaPC. Uses the MegaPC BIOS ROMs
      (same files as the MegaPC machine BIOS).
    source_ref: "src/vid_paradise.c:348-358"

  - name: "nVidia RIVA 128 BIOS"
    path: "roms/riva128.bin"
    required: false
    note: "nVidia RIVA 128 video BIOS (64 KB). Marked experimental."
    source_ref: "src/vid_nv_riva128.c:1096, 1152"

  - name: "nVidia RIVA TNT BIOS"
    path: "roms/rivatnt.bin"
    required: false
    note: "nVidia RIVA TNT video BIOS (64 KB). Marked experimental."
    source_ref: "src/vid_nv_rivatnt.c:1126, 1182"

  # ========================================================
  # SOUND CARD ROMs
  # ========================================================
  - name: "Sound Blaster AWE32 ROM"
    path: "roms/awe32.raw"
    required: false
    note: >
      Creative Sound Blaster AWE32 sample ROM for EMU8000 synth chip.
      Required when SB AWE32 sound card is selected.
    source_ref: "src/sound_emu8k.c:679, src/sound_sb.c:479"

  # ========================================================
  # NETWORK CARD ROMs
  # ========================================================
  - name: "Realtek RTL8029AS boot ROM"
    path: "roms/rtl8029as.rom"
    required: false
    note: "Realtek RTL8029AS PCI Ethernet boot ROM (32 KB)."
    source_ref: "src/ne2000.c:1694"

  - name: "NE2000 boot ROM"
    path: "roms/ne2000.rom"
    required: false
    note: "NE2000 ISA Ethernet boot ROM (64 KB)."
    source_ref: "src/ne2000.c:1701"

notes:
  rom_structure: >
    All ROM files are loaded relative to the RetroArch system directory.
    Machine BIOS ROMs go in roms/<machine_name>/ subdirectories.
    Video card ROMs go directly in roms/ (or roms/<card>/ for some).
    Which ROMs are needed depends on the selected machine model and video card.
  minimum_requirement: >
    At minimum, the mda.rom font and one machine BIOS set are required.
    The video card ROM for the selected GPU is also needed unless the machine
    has built-in video (PCjr, Tandy, Amstrad, Acer 386SX, PS/1).
  libretro_version: >
    Based on PCem v10.1. The libretro port is quite old and may not match
    current standalone PCem/86Box ROM paths.