| Name | Description | Year | Manufacturer | Rom | Clone | Sample |
| mc6847y_ntsc | Motorola MC6847Y VDG (NTSC) | | | | | |
| mc6847y_pal | Motorola MC6847Y VDG (PAL) | | | | | |
| mc6852 | Motorola MC6852 SSDA | | | | | |
| mc6854 | Motorola MC6854 ADLC | | | | | |
| mc68681 | MC68681 DUART | | | | | |
| mc68901 | Motorola MC68901 MFP | | | | | |
| mc68ez328 | MC68EZ328 DragonBall-EZ Processor | | | | | |
| mc68hc11a1 | Motorola MC68HC11A1 | | | | | |
| mc68hc11d0 | Motorola MC68HC11D0 | | | | | |
| mc68hc11e1 | Motorola MC68HC11E1 | | | | | |
| mc68hc11f1 | Motorola MC68HC11F1 | | | | | |
| mc68hc11k1 | Motorola MC68HC11K1 | | | | | |
| mc68hc11m0 | Motorola MC68HC11M0 | | | | | |
| mc68hc16z1 | Motorola MC68HC16Z1 | | | | | |
| mc68hc811e2 | Motorola MC68HC811E2 | | | | | |
| mc7105 | MC7105 | 1983 | Elektronika | | | |
| mc8020 | MC-80.21/22 | 198? | VEB Elektronik Gera | | | |
| mc8030 | MC-80.30/31 | 198? | VEB Elektronik Gera | | | |
| mc8123 | MC-8123 | | | | | |
| mc88100 | Motorola MC88100 | | | | | |
| mc88200 | Motorola MC88200 Cache/Memory Management Unit | | | | | |
| mcard_h8 | Magic Card (H8, English) | 200? | <unknown> | cmagica | cmagica | |
| mcastle | Magic Castle | 1984 | Zaccaria | | | genpin |
| mcastlef | Magic Castle (French speech) | 1984 | Zaccaria | mcastle | mcastle | genpin |
| mcastleg | Magic Castle (German speech) | 1984 | Zaccaria | mcastle | mcastle | genpin |
| mcastlei | Magic Castle (Italian speech) | 1984 | Zaccaria | mcastle | mcastle | genpin |
| mcatadv | Magical Cat Adventure | 1993 | Wintechno | | | |
| mcatadvj | Magical Cat Adventure (Japan) | 1993 | Wintechno | mcatadv | mcatadv | |
| mcb216 | MCB-216 | 1979 | Cromemco | | | |
| mccpm | mc-CP/M-Computer | 1981 | GRAF Elektronik Systeme GmbH | | | |
| mccs1850 | MCCS1850 RTC | | | | | |
| mcd_isa | Mitsumi ISA CD-ROM Adapter | | | | | |
| mcd212 | MCD212 VDSC | | | | | |
| mcf5206e | Freescale MCF5206E | | | | | |
| mcf5206e_peripheral | MCF5206E Peripheral | | | | | |
| mcg85 | MCG-85 | 1981 | Atlantis Computers | | | |
| mcga | Memory Controller Gate Array | | | | | |
| mchampdx | Multi Champ Deluxe (ver. 0106, 06/01/2000) | 2000 | ESD | | | |
| mchampdxa | Multi Champ Deluxe (ver. 1126, 26/11/1999) | 1999 | ESD | mchampdx | mchampdx | |
| mchampdxb | Multi Champ Deluxe (ver. 1114, 14/11/1999) | 1999 | ESD | mchampdx | mchampdx | |
| mcheonru | Ma Cheon Ru | 1999 | SemiCom / AceVer | | | |
| mchess | Computer Chess (Mattel) | 1980 | Mattel Electronics / Teletape Productions | | | |
| mchilli | More Chilli (20248711, NSW/ACT) | 2008 | Aristocrat | aristmk6 | | |
| mchilliq | More Chilli (20289311, Queensland) | 2010 | Aristocrat | mchilli | mchilli | |
| mcircus | Merry Circus (Version 1.0.2) | 2009 | Amcoe | | | |
| mcitylov | City Love (Japan 860904, medal) | 1986 | Nichibutsu | citylove | citylove | |
| mclass | Magic Class (Ver 2.2) | 200? | <unknown> | | | |
| mcm70 | MCM/70 | 1974 | Micro Computer Machines | | | |
| mcmseng | Mountain Computer Music System engine | | | | | |
| mcnpshnt | Mahjong Campus Hunting (Japan) | 1990 | Dynax | | | |
| mcolors | Magic Colors (ver. 1.7a) | 1999 | ABM Games | | | |
| mcolorsa | Magic Colors (ver. 1.6) | 1999 | ABM Games | mcolors | mcolors | |
| mcom4_02 | Minicom IV (2002-04-19) | 2002 | Ultratec | | | |
| mcombat | Missile Combat (Videotron bootleg, set 1) | 1980 | bootleg (Videotron) | missile | missile | |
| mcombata | Missile Combat (Videotron bootleg, set 2) | 1980 | bootleg (Videotron) | missile | missile | |
| mcombats | Missile Combat (Sidam bootleg) | 1980 | bootleg (Sidam) | missile | missile | |
| mcompgin | Computer Gin | 1979 | Mattel Electronics | | | |
| mcontest | Miss Mahjong Contest (Japan) | 1989 | Nichibutsu | | | |
| mcpx_ac97_audio | MCPX AC'97 Audio Codec Interface | | | | | |
| mcpx_ac97_modem | MCPX AC'97 Modem Controller | | | | | |
| mcpx_apu | MCP APU | | | | | |
| mcpx_eth | MCP Networking Adapter | | | | | |
| mcpx_ide | MCPX IDE Controller | | | | | |
| mcpx_isalpc | MCPX HUB Interface - ISA Bridge | | | | | |
| mcpx_ohci | MCPX OHCI USB Controller | | | | | |
| mcpx_smbus | MCPX SMBus Controller | | | | | |
| mcs3201 | Motorola MCS3201 FDC | | | | | |
| mct_adr | MCT-ADR Address Path Controller | | | | | |
| mcwars | Macro-Cosm Wars (bootleg of Galaxian) | 1979 | bootleg | galaxian | galaxian | |
| mcx128 | Darren Atkinson's MCX-128 cartridge | | | | | |
| md_cart_slot | Mega Drive Cartridge Slot | | | | | |
| md_eeprom_blara | MD Brian Lara | | | | | |
| md_eeprom_cslam | MD College Slam | | | | | |
| md_eeprom_mode1 | MD Serial EEPROM Mode 1 | | | | | |
| md_eeprom_nbajam | MD NBA Jam | | | | | |
| md_eeprom_nbajama | MD NBA Jam (Alt) | | | | | |
| md_eeprom_nbajamte | MD NBA Jam TE | | | | | |
| md_eeprom_nflqb | MD NFL Quarterback 96 | | | | | |
| md_eeprom_nhlpa | MD NHLPA 93 | | | | | |
| md_eeprom_stm95 | MD Cart + EEPROM STM95 | | | | | |
| md_ggenie | MD Game Genie | | | | | |
| md_jcart | MD J-Cart games | | | | | |
| md_kbd | Micro-Decision Keyboard | | | | | |
| md_rom_16mj2 | MD 16 Majong Tiles II | | | | | |
| md_rom_beggarp | MD Beggar Prince | | | | | |
| md_rom_bugslife | MD A Bug's Life | | | | | |
| md_rom_chinf3 | MD Chinese Fighter 3 | | | | | |
| md_rom_cjmjclub | MD Chaoji Majiang Club / Super Mahjong Club | | | | | |
| md_rom_cm2in1 | MD Codemasters 2in1 | | | | | |
| md_rom_elfwor | MD Linghuan Daoshi Super Magician / Elf Wor | | | | | |
| md_rom_fram | MD Standard cart + FRAM | | | | | |
| md_rom_kof98 | MD KOF 98 | | | | | |
| md_rom_kof99 | MD KOF 99 | | | | | |
| md_rom_lion2 | MD Lion King 2 | | | | | |
| md_rom_lion3 | MD Lion King 3 | | | | | |
| md_rom_mcpirate | MD Pirate Multicarts (various) | | | | | |
| md_rom_mjlov | MD Majiang Qingren / Mahjong Lover | | | | | |
| md_rom_pokea | MD Pokemon (alt protection) | | | | | |
| md_rom_pokestad | MD Pokemon Stadium | | | | | |
| md_rom_radica | MD Radica TV games | | | | | |
| md_rom_realtec | MD Realtec | | | | | |
| md_rom_redcl | MD Redcliff | | | | | |
| md_rom_rx3 | MD Rockman X3 | | | | | |
| md_rom_sbubl | MD Super Bubble Bobble | | | | | |
| md_rom_sk | MD Sonic & Knuckles | | | | | |
| md_rom_smb | MD Super Mario Bros. | | | | | |
| md_rom_smb2 | MD Super Mario Bros. 2 | | | | | |
| md_rom_smouse | MD Huan Le Tao Qi Shu / Smart Mouse | | | | | |
| md_rom_smw64 | MD Super Mario World 64 | | | | | |
| md_rom_soulb | MD Soul Blade | | | | | |
| md_rom_squir | MD Squirrel King | | | | | |
| md_rom_sram | MD Standard cart + SRAM | | | | | |
| md_rom_sram_arg96 | MD Futbol Argentino 96 | | | | | |
| md_rom_ssf2 | MD Super SF2 | | | | | |
| md_rom_starodys | MD Star Odyssey | | | | | |
| md_rom_svp | MD Virtua Racing | | | | | |
| md_rom_tc2000 | MD TC2000 | | | | | |
| md_rom_tekkensp | MD Tekken Special | | | | | |
| md_rom_topf | MD Top Fighter | | | | | |
| md_rom_wukong | MD Legend of Wukong | | | | | |
| md_rom_yasech | MD Ya Se Chuan Shuo | | | | | |
| md_seprom_codemast | MD J-Cart games + SEPROM | | | | | |
| md_seprom_mm96 | MD Micro Machine 96 | | | | | |
| md_std_eeprom | MD Standard cart + EEPROM | | | | | |
| md_std_rom | MD Standard cart | | | | | |
| md2 | Micro Decision MD-2 | 1982 | Morrow Designs | | | |
| md23do | Mad Dog II: The Lost Gold (3DO hardware) | 199? | American Laser Games | alg3do | | |
| md3 | Micro Decision MD-3 | 1982 | Morrow Designs | md2 | md2 | |
| md4330b | Mitel MD4330B LCD Driver | | | | | |
| md4332b | Mitel MD4332B LCD Driver | | | | | |
| md4duvc | MD-4DUV VER:2.1 | 199? | Aquarius System (ASI) | ibm5170 | ibm5170 | |
| md6802 | Mikrodator 6802 | 1983 | Didact AB | | | |
| md8412b | Fujifilm MD8412B IEEE-1394 LLC | | | | | |
| md90_120 | Thomson MD 90-120 Modem | | | | | |
| mdallas | Dalla$ (J.R. handheld) | 1981 | Mattel Electronics | | | |
| mdchoice | Dealer's Choice (E4A1) | 1983 | Merit | pitboss | pitboss | |
| mdcr | Philips Mini-DCR | | | | | |
| mdhorse | Derby Quiz My Dream Horse (Japan, MDH1/VER.A2) | 1998 | MOSS / Namco | | | |
| mdisk | M-Disk Comp.-A | 198? | mupid | | | |
| mdisplay1 | Mephisto Display Module 1 | | | | | |
| mdisplay2 | Mephisto Display Module 2 | | | | | |
| mdndclab | Dungeons & Dragons: Computer Labyrinth Game | 1980 | Mattel Electronics | | | |
| mdntmrdr | Midnight Marauders (Gun game) | 1984 | Bally Midway | | | genpin |
| mdrawpkr | Draw Poker - Joker's Wild (Standard) | 1984 | Meyco Games, Inc. | | | |
| mdrawpkra | Draw Poker - Joker's Wild (02-11) | 1984 | Meyco Games, Inc. | mdrawpkr | mdrawpkr | |
| mdrink | Magic Drink (Ver 1.2) | 2001 | <unknown> | | | |
| mdt60 | MDT 60 Video Display Terminal | 1983 | Morrow Designs | | | |
| mdtvp1j | Mega Drive Play TV 1 (Japan) | 2004 | Sega Toys | rad_gen1 | rad_gen1 | |
| mdtvp2j | Mega Drive Play TV 2 (Japan) | 2004 | Sega Toys | rad_gen2 | rad_gen2 | |
| mdtvp3j | Mega Drive Play TV 3 (Japan) | 2004 | Sega Toys | rad_sf2 | rad_sf2 | |
| mduckspa | Super Quique / Mega Duck (Spain) | 199? | Cefa Toys | | | |
| mea8000 | Philips/Signetics MEA 8000 speech synthesizer | | | | | |
| mead4in1 | Meadows 4 in 1 | 1976 | Meadows | | | |
| mechatt | Mechanized Attack (World) | 1989 | SNK | | | |
| mechattj | Mechanized Attack (Japan) | 1989 | SNK | mechatt | mechatt | |
| mechattu | Mechanized Attack (US) | 1989 | SNK | mechatt | mechatt | |
| mechattu1 | Mechanized Attack (US, Version 1, Single Player) | 1989 | SNK | mechatt | mechatt | |
| medalnt | Medal no Tatsujin Doki! Ooatari-Darake no Sugoroku Matsuri (MTL1 SPR0B) | 2005 | Namco | | | |
| medalnt2 | Medal no Tatsujin 2 Atsumare! Go! Go! Sugoroku Sentai Don Ranger Five (MTA1 STMPR0A) | 2007 | Namco | | | |
| medalnta | Medal no Tatsujin Doki! Ooatari-Darake no Sugoroku Matsuri (MTL1 SPR0A) | 2005 | Namco | medalnt | medalnt | |
| mediagx | Cyrix MediaGX | | | | | |
| mediagx_cs5530_bridge | MediaGX CS5530 Bridge | | | | | |
| mediagx_cs5530_ide | MediaGX CS5530 IDE Controller | | | | | |
| mediagx_cs5530_video | MediaGX CS5530 Video Controller | | | | | |
| mediagx_host | MediaGX X-Bus Host PCI | | | | | |
| mediagx_vga | MediaGX Virtual VGA i/f | | | | | |
| medlanes | Meadows Lanes | 1977 | Meadows Games, Inc. | | | |
| medusa | Medusa | 1981 | Bally | | | genpin |
| meg | Multiple Effects Generator (HD62098 / XM309A00) | | | | | |
| mega10k | Mega 10.000: L'Encyclopédie Électronique | 1980 | Jeux Nathan | | | |
| mega4 | Mephisto Mega IV (set 1) | 1988 | Hegener + Glaser | | | |
| mega4a | Mephisto Mega IV (set 2) | 1988 | Hegener + Glaser | mega4 | mega4 | |
| megaaton | Meg-Aaton | 1983 | Playmatic | | | genpin |
| megaatona | Meg-Aaton (alternate set) | 1983 | Playmatic | megaaton | megaaton | genpin |
| megablst | Mega Blast (World) | 1989 | Taito Corporation Japan | | | |
| megablstj | Mega Blast (Japan) | 1989 | Taito Corporation | megablst | megablst | |
| megablstu | Mega Blast (US) | 1989 | Taito America Corporation | megablst | megablst | |
| megacard | Mega Card (Ver.0210, encrypted) | 1993 | Fun World | | | |
| megacarda | Mega Card (Ver.0053, encrypted) | 1993 | Fun World | megacard | megacard | |
| megacd | Mega-CD (Europe, PAL) | 1993 | Sega | segacd | segacd | |
| megacd2 | Mega-CD 2 (Europe, PAL) | 1993 | Sega | segacd2 | segacd2 | |
| megacd2j | Mega-CD 2 (Japan, NTSC) | 1993 | Sega | segacd2 | segacd2 | |
| megacda | Mega-CD (Asia, PAL) | 1991 | Sega | segacd | segacd | |
| megacdj | Mega-CD (Japan, NTSC) | 1991 | Sega | segacd | segacd | |
| megadble | Mega Double Poker (Ver. 1.63 Espagnol) | 1990 | Blitz Systems Inc. | | | |
| megadblj | Mega Double Poker Jackpot (Ver. 1.26) | 1990 | Blitz Systems Inc. | | | |
| megadon | Megadon | 1982 | Epos Corporation (Photar Industries license) | | | |
| megadpkr | Mega Double Poker (conversion kit, version 2.3 MD) | 1990 | Blitz System | | | |
| megadpkrb | Mega Double Poker (conversion kit, version 2.1 MD) | 1990 | Blitz System | megadpkr | megadpkr | |
| megadri4 | Mega Drive 4 / Guitar Idol (set 1) | 2009 | Tectoy (licensed from Sega) | | | |
| megadri4a | Mega Drive 4 / Guitar Idol (set 2) | 2009 | Tectoy (licensed from Sega) | megadri4 | megadri4 | |
| megadrij | Mega Drive (Japan, NTSC) | 1988 | Sega | genesis | genesis | |
| megadriv | Mega Drive (Europe, PAL) | 1990 | Sega | genesis | genesis | |
| megadrive_io_port | Sega Mega Drive I/O Port Controller | | | | | |
| megaduck | Mega Duck / Cougar Boy | 1993 | Welback Holdings (Timlex International) / Creatronic / Videojet / Cougar USA | | | |
| megaduck_cart_slot | Mega Duck Cartridge Slot | | | | | |
| megaduck_rom | Mega Duck Flat ROM Cartridge | | | | | |
| megaduck_rom_banked | Mega Duck Banked ROM Cartridge | | | | | |
| megaforc | Mega Force (World) | 1984 | Tehkan | starforc | starforc | |
| megaforcu | Mega Force (US) | 1985 | Tehkan (Video Ware license) | starforc | starforc | |
| megajet | Mega Jet (Japan Mega Drive handheld) | 1993 | Sega | gen_nomd | gen_nomd | |
| megakat | Mega Katok 2 | 2002? | Novotech | | | |
| megaline | Mega Lines | 1991 | Fun World | | | |
| megaman | Mega Man: The Power Battle (CPS1, USA 951006) | 1995 | Capcom | | | |
| megaman2 | Mega Man 2: The Power Fighters (USA 960708) | 1996 | Capcom | | | |
| megaman2a | Mega Man 2: The Power Fighters (Asia 960708) | 1996 | Capcom | megaman2 | megaman2 | |
| megaman2h | Mega Man 2: The Power Fighters (Hispanic 960712) | 1996 | Capcom | megaman2 | megaman2 | |
| megamana | Mega Man: The Power Battle (CPS1, Asia 951006) | 1995 | Capcom | megaman | megaman | |
| megamn2d | Mega Man 2: The Power Fighters (USA 960708 Phoenix Edition) (bootleg) | 1996 | bootleg | megaman2 | megaman2 | |
| megapad | Megapad 31-in-1 | 200? | Waixing | | | |
| megapc | MegaPC | 1993 | Amstrad plc | | | |
| megapcpl | MegaPC Plus | 199? | Amstrad plc | megapc | megapc | |
| megapcpla | MegaPC Plus (WINBUS chipset) | 199? | Amstrad plc | megapc | megapc | |
| megaphx | Mega Phoenix | 1991 | Dinamic / Inder | | | |
| megaplay | Mega Play BIOS | 1993 | Sega | | | |
| megast | MEGA ST (USA) | 1987 | Atari | st | st | |
| megast_de | MEGA ST (Germany) | 1987 | Atari | st | st | |
| megast_fr | MEGA ST (France) | 1987 | Atari | st | st | |
| megast_se | MEGA ST (Sweden) | 1987 | Atari | st | st | |
| megast_sg | MEGA ST (Switzerland) | 1987 | Atari | st | st | |
| megast_uk | MEGA ST (UK) | 1987 | Atari | st | st | |
| megaste | MEGA STe (USA) | 1991 | Atari | ste | ste | |
| megaste_de | MEGA STe (Germany) | 1991 | Atari | ste | ste | |
| megaste_es | MEGA STe (Spain) | 1991 | Atari | ste | ste | |
| megaste_fr | MEGA STe (France) | 1991 | Atari | ste | ste | |
| megaste_it | MEGA STe (Italy) | 1991 | Atari | ste | ste | |
| megaste_se | MEGA STe (Sweden) | 1991 | Atari | ste | ste | |
| megaste_uk | MEGA STe (UK) | 1991 | Atari | ste | ste | |
| megastrp | Mega Double Strip (Ver. 1.10b) | 1992 | Blitz Systems Inc. | | | |
| megat | Pit Boss Megatouch (9234-20-01 R0A) | 1994 | Merit | | | |
| megat2 | Pit Boss Megatouch II (9255-10-01 R0G, Standard version) | 1994 | Merit | | | |
| megat2a | Pit Boss Megatouch II (9255-10-01 R0E, Standard version) | 1994 | Merit | megat2 | megat2 | |
| megat2b | Pit Boss Megatouch II (9255-10-01 R0D, Standard version) | 1994 | Merit | megat2 | megat2 | |
| megat2ca | Pit Boss Megatouch II (9255-10-06 R0G, California version) | 1994 | Merit | megat2 | megat2 | |
| megat2caa | Pit Boss Megatouch II (9255-10-06 R0E, California version) | 1994 | Merit | megat2 | megat2 | |
| megat2mn | Pit Boss Megatouch II (9255-10-02 R0G, Minnesota version) | 1994 | Merit | megat2 | megat2 | |
| megat3 | Megatouch III (9255-20-01 R0N, Standard version) | 1996 | Merit | | | |
| megat3a | Megatouch III (9255-20-01 R0K, Standard version) | 1995 | Merit | megat3 | megat3 | |
| megat3b | Megatouch III (9255-20-01 R0F, Standard version) | 1995 | Merit | megat3 | megat3 | |
| megat3c | Megatouch III (9255-20-01 R0B, Standard version) | 1995 | Merit | megat3 | megat3 | |
| megat3ca | Megatouch III (9255-20-06 R0N, California version) | 1996 | Merit | megat3 | megat3 | |
| megat3caa | Megatouch III (9255-20-06 R0D, California version) | 1995 | Merit | megat3 | megat3 | |
| megat3d | Megatouch III (9255-20-01 R0A, Standard version) | 1995 | Merit | megat3 | megat3 | |
| megat3nj | Megatouch III (9255-20-07 R0G, New Jersey version) | 1995 | Merit | megat3 | megat3 | |
| megat3te | Megatouch III Tournament Edition (9255-30-01 R0E, Standard version) | 1996 | Merit | megat3 | megat3 | |
| megat3tg | Megatouch III Turnier Edition (9255-30-50 R0F, Bi-Lingual GER/ENG version) | 1996 | Merit | megat3 | megat3 | |
| megat4 | Megatouch IV (9255-40-01 R0E, Standard version) | 1996 | Merit | | | |
| megat4a | Megatouch IV (9255-40-01 R0D, Standard version) | 1996 | Merit | megat4 | megat4 | |
| megat4b | Megatouch IV (9255-40-01 R0B, Standard version) | 1996 | Merit | megat4 | megat4 | |
| megat4c | Megatouch IV (9255-40-01 R0A, Standard version) | 1996 | Merit | megat4 | megat4 | |