| Name | Description | Year | Manufacturer | Rom | Clone | Sample |
| xsleenaba | Xain'd Sleena (bootleg, bugfixed) | 1987 | bootleg | xsleena | xsleena | |
| xsleenabb | Xain'd Sleena (bootleg, set 2) | 1987 | bootleg | xsleena | xsleena | |
| xsleenaj | Xain'd Sleena (Japan) | 1986 | Technos Japan | xsleena | xsleena | |
| xt_hdc | Generic PC-XT Fixed Disk Controller | | | | | |
| xt446 | Yamaha XT446 synth (embedded MU100B) | | | | | |
| xtensa | Tensilica Xtensa core | | | | | |
| xtheball | X the Ball | 1991 | Rare | | | |
| xtide | XT-IDE Fixed Drive Adapter | | | | | |
| xtom3d | X Tom 3D | 1999 | Andamiro / Jamie System Development | | | |
| xtrain | X-Train (Ver. 1.3) | 1999 | Subsino | | | |
| xtrial | Xtrial Racing (ver JAB) | 2002 | Konami | kviper | | |
| xtrmhnt2 | Extreme Hunting 2 | 2006 | Sega | awbios | | |
| xtrmhunt | Extreme Hunting | 2004 | Sammy | awbios | | |
| xunitvid | Midway X-Unit Video | | | | | |
| xvd701 | JVC XV-D701 | | | | | |
| xxmissio | XX Mission | 1986 | UPL | | | |
| xybots | Xybots (rev 2) | 1987 | Atari Games | | | |
| xybots0 | Xybots (rev 0) | 1987 | Atari Games | xybots | xybots | |
| xybots1 | Xybots (rev 1) | 1987 | Atari Games | xybots | xybots | |
| xybotsf | Xybots (French, rev 3) | 1987 | Atari Games | xybots | xybots | |
| xybotsg | Xybots (German, rev 3) | 1987 | Atari Games | xybots | xybots | |
| xyddz | Xiaoyao Dou Dizhu (V216CN) | 200? | IGS | | | |
| xyddzhh | Xingyun Dou Dizhu | 2006 | Herb Home | | | |
| xydn | Xiyou Douniu (S110CN) | 200? | IGS | | | |
| xymg | Xingyun Manguan (China, V651C, set 1) | 1996 | IGS | | | |
| xymga | Xingyun Manguan (China, V651C, set 2) | 1996 | IGS | xymg | xymg | |
| xyonix | Xyonix | 1989 | Philko | | | |
| xypdk | Xingyun Pao De Kuai (V106CN) | 2005 | IGS | | | |
| xypmd | Xingyun Paomadi Super (V401CN) | 2003 | IGS | | | |
| xypmda | Xingyun Paomadi (unknown ver) | 1999 | IGS | xypmd | xypmd | |
| y2404 | Y2404 | | | | | |
| y301xl | 301 XL (Yeno) | 1988 | Yeno / Bray Research | | | |
| y416xl | 416 XL (Yeno) | 1989 | Yeno | | | |
| y503iiir | YIS-503 III R (MSX2, USSR) | 1985 | Yamaha | | | |
| y503iiire | YIS-503 III R (MSX2, Estonian) | 198? | Yamaha | y503iiir | y503iiir | |
| y503iir | YIS503IIR (MSX1, USSR) | 1985 | Yamaha | yis503 | yis503 | |
| y503iir2 | YIS503IIR (MSX1, Estonian) | 1986 | Yamaha | yis503 | yis503 | |
| y532xl | 532 XL (Yeno) | 1989 | Yeno | | | |
| y805128 | YIS805/128 (MSX2, Japan) | 1986 | Yamaha | y805256 | y805256 | |
| y805128r2 | YIS805/128R2 (MSX2, USSR) | 1986 | Yamaha | y805256 | y805256 | |
| y805128r2e | YIS805/128R2 (MSX2, Estonian) | 198? | Yamaha | y805256 | y805256 | |
| y805256 | YIS805/256 (MSX2, Japan) | 198? | Yamaha | | | |
| y8950 | Y8950 OPL MSX-Audio | | | | | |
| yachtmn | Yachtsman | 1982 | Sanritsu / Esco | mermaid | mermaid | |
| yakyuken | The Yakyuken (bootleg) | 1982 | bootleg | | | |
| yamagchi | Go Go Mr. Yamaguchi / Yuke Yuke Yamaguchi-kun | 1985 | Kaneko / Taito | | | |
| yamato | Yamato (set 1) | 1983 | Sega | | | |
| yamatoa | Yamato (set 2) | 1983 | Sega | yamato | yamato | |
| yamatou | Yamato (US) | 1983 | Sega | yamato | yamato | |
| yamyam | Yam! Yam!? | 1990 | Dooyong | | | |
| yamyamk | Yam! Yam! (Korea) | 1990 | Dooyong | yamyam | yamyam | |
| yanchamr | Kaiketsu Yanchamaru (Japan) | 1986 | Irem | kidniki | kidniki | |
| yankeedo | Yankee DO! | 1982 | hack | mrdo | mrdo | |
| yarunara | Mahjong Yarunara (Japan) | 1991 | Dynax | | | |
| yattrmnp | Yatterman Plus (J 981006 V1.000) | 1998 | Sega | stvbios | | |
| yc64 | YC-64 (MSX1, Europe) | 1984 | Yashica | | | |
| yellowcbb | Yellow Cab (bootleg) | 1984 | bootleg | kamikcab | kamikcab | |
| yellowcbj | Yellow Cab (Japan) | 1984 | Data East Corporation | kamikcab | kamikcab | |
| yes | :YES | 1985 | Philips | | | |
| yesnoj | Yes/No Sinri Tokimeki Chart | 1992 | Taito Corporation | | | |
| ygv608 | YGV608 VDP | | | | | |
| yiear | Yie Ar Kung-Fu (version I) | 1985 | Konami | | | |
| yiear2 | Yie Ar Kung-Fu (version G) | 1985 | Konami | yiear | yiear | |
| yieartf | Yie Ar Kung-Fu (bootleg GX361 conversion) | 1985 | bootleg | yiear | yiear | |
| yis303 | YIS303 (MSX1, Japan) | 1984 | Yamaha | | | |
| yis503 | YIS503 (MSX1, Japan) | 1984 | Yamaha | | | |
| yis503f | YIS503F (MSX1, French) | 1984 | Yamaha | yis503 | yis503 | |
| yis503ii | YIS503II (MSX1, Japan) | 1985 | Yamaha | yis503 | yis503 | |
| yis604 | YIS604/128 (MSX2, Japan) | 1985 | Yamaha | | | |
| yizhix | Yizhi Xiangqi | 1996 | WHT | | | |
| ym2148 | Yamaha YM2148 MIDI/Keyboard Interface | | | | | |
| ym2149 | YM2149 SSG | | | | | |
| ym2151 | YM2151 OPM | | | | | |
| ym2154 | YM2154 (RYP4) | | | | | |
| ym2164 | YM2164 OPP | | | | | |
| ym2203 | YM2203 OPN | | | | | |
| ym2413 | YM2413 OPLL | | | | | |
| ym2414 | YM2414 OPZ | | | | | |
| ym2423 | YM2423 OPLL-X | | | | | |
| ym2608 | YM2608 OPNA | | | | | |
| ym2610 | YM2610 OPNB | | | | | |
| ym2610b | YM2610B OPNB2 | | | | | |
| ym2612 | YM2612 OPN2 | | | | | |
| ym3438 | YM3438 OPN2C | | | | | |
| ym3439 | YM3439 SSGC | | | | | |
| ym3526 | YM3526 OPL | | | | | |
| ym3533 | YM3533 OPQ | | | | | |
| ym3802 | Yamaha YM3802 MCS MIDI Communication and Service Controller | | | | | |
| ym3806 | YM3806 OPQ | | | | | |
| ym3812 | YM3812 OPL2 | | | | | |
| ym7101 | Yamaha YM7101 | | | | | |
| ymcapsul | Yu-Gi-Oh Monster Capsule | 1999 | Konami | | | |
| ymf262 | YMF262 OPL3 | | | | | |
| ymf271 | Yamaha YMF271 OPX | | | | | |
| ymf276 | YMF276 OPN2L | | | | | |
| ymf278b | YMF278B OPL4 | | | | | |
| ymf281 | YMF281 OPLLP | | | | | |
| ymw258f | Yamaha YMW-258-F | | | | | |
| ymz280b | Yamaha YMZ280B PCMD8 | | | | | |
| ymz284 | YMZ284 SSGL | | | | | |
| ymz294 | YMZ294 SSGLP | | | | | |
| ymz770 | Yamaha YMZ770C AMMS-A | | | | | |
| ymz774 | Yamaha YMZ774 AMMS2C | | | | | |
| yorijori | Yori Jori Kuk Kuk | 2002 | Golden Bell Entertainment | | | |
| yosakdon | Yosaku to Donbei (set 1) | 1979 | Wing | | | invaders |
| yosakdona | Yosaku to Donbei (set 2) | 1979 | Wing | yosakdon | yosakdon | invaders |
| yosimotm | Mahjong Yoshimoto Gekijou (Japan, medal) | 1994 | Nichibutsu / Yoshimoto Kougyou | yosimoto | yosimoto | |
| yosimoto | Mahjong Yoshimoto Gekijou (Japan) | 1994 | Nichibutsu / Yoshimoto Kougyou | | | |
| youjyudn | Youjyuden (Japan) | 1986 | Irem | | | |
| youkai | Youkai VS Uchuujin | 2007 | Amodio / Tomy | | | |
| youkaidk1 | Youkai Douchuuki (Japan, old version (YD1)) | 1987 | Namco | shadowld | shadowld | |
| youkaidk2 | Youkai Douchuuki (Japan, new version (YD2, Rev B)) | 1987 | Namco | shadowld | shadowld | |
| youma | Youma Ninpou Chou (Japan) | 1986 | Nichibutsu | ninjemak | ninjemak | |
| youma2 | Youma Ninpou Chou (Japan, alt) | 1986 | Nichibutsu | ninjemak | ninjemak | |
| youmab | Youma Ninpou Chou (Game Electronics bootleg, set 1) | 1986 | bootleg | ninjemak | ninjemak | |
| youmab2 | Youma Ninpou Chou (Game Electronics bootleg, set 2) | 1986 | bootleg | ninjemak | ninjemak | |
| yoyospel | YoYo Spell (prototype) | 1992 | Inder | littlerb | littlerb | |
| yujan | Yu-Jan | 1999 | Yubis / T.System | macsbios | | |
| yujogs | Yujo Gattai Shishigami-o | 2007 | Amodio / Tomy | | | |
| yuka | Yu-Ka | 1999 | Yubis / T.System | macsbios | | |
| yukiwo | Yukiwo (World, prototype) | 1989 | Taito Corporation Japan | masterw | masterw | |
| yukon | Yukon (version 2.0) | 1989 | Exidy | | | |
| yukon1 | Yukon (version 1.0) | 1989 | Exidy | yukon | yukon | |
| yukongl5 | Yukon Gold (03J00191, NSW/ACT) | 2000 | Aristocrat | aristmk5 | | |
| yukongld | Yukon Gold (Russian) | 2000 | WMS | | | |
| yumefuda | Yumefuda | 1991 | Alba | | | |
| yutnori | Puzzle Yutnori (Korea) | 1999 | Nunal | | | |
| yuyugogo | Yuuyu no Quiz de GO!GO! (Japan) | 1990 | Taito Corporation | | | |
| yuyuhaku | The Battle of Yu Yu Hakusho: Shitou! Ankoku Bujutsukai! | 2006 | Banpresto | sys256 | | |
| yyhm | Yuanyang Hudie Meng (Version 8.8A 2005-09-25) | 2005 | GMS | | | |
| z_89_11 | Heath/Zenith Z-89-11 Multi-Function I/O Card | | | | | |
| z100 | Z-100 | 1982 | Zenith Data Systems | | | |
| z1013 | Z1013 (matrix 8x4) | 1985 | VEB Robotron Electronics Riesa | | | |
| z1013a2 | Z1013 (matrix 8x8) | 1985 | VEB Robotron Electronics Riesa | z1013 | z1013 | |
| z1013k69 | Z1013 (K7669) | 1985 | VEB Robotron Electronics Riesa | z1013 | z1013 | |
| z1013k76 | Z1013 (K7659) | 1985 | VEB Robotron Electronics Riesa | z1013 | z1013 | |
| z1013s60 | Z1013 (K7652/S6009) | 1985 | VEB Robotron Electronics Riesa | z1013 | z1013 | |
| z180asci_channel_0 | Z180 ASCI Channel 0 | | | | | |
| z180asci_channel_1 | Z180 ASCI Channel 1 | | | | | |
| z180asci_ext_channel_0 | Z180 ASCI Extended Channel 0 | | | | | |
| z180asci_ext_channel_1 | Z180 ASCI Extended Channel 1 | | | | | |
| z180csio | Z180 CSIO | | | | | |
| z22 | Z-22 Terminal | 1984 | Zenith Data Systems | | | |
| z29 | Z-29 Terminal | 1983 | Zenith Data Systems | | | |
| z29_kbd | Z-29 Keyboard Port | | | | | |
| z80 | Zilog Z80 | | | | | |
| z8001 | Zilog Z8001 | | | | | |
| z8002 | Zilog Z8002 | | | | | |
| z80180 | Zilog Z80180 | | | | | |
| z80182 | Zilog Z80182 | | | | | |
| z8036 | Zilog Z8036 Z-CIO | | | | | |
| z8038 | FIFO Input/Output Interface Unit | | | | | |
| z80clock | Z80 based, triple time zone clock | 2020 | Tom Storey | | | |
| z80ctc | Z80 CTC | | | | | |
| z80ctc_channel | Z80 CTC Channel | | | | | |
| z80daisy_generic | Generic Z80 daisy chain device | | | | | |
| z80dart | Z80 DART | | | | | |
| z80dart_channel | Z80 DART channel | | | | | |
| z80dev | Z80 dev board | 198? | <unknown> | | | |
| z80dma | Zilog Z80 DMA Controller | | | | | |
| z80n | Z80N | | | | | |
| z80ne | Z80NE | 1980 | Nuova Elettronica | | | |
| z80net | Z80NE + LX.388 | 1980 | Nuova Elettronica | z80ne | z80ne | |
| z80netb | Z80NE + LX.388 + Basic 16k | 1980 | Nuova Elettronica | z80ne | z80ne | |
| z80netf | Z80NE + LX.388 + LX.390 | 1980 | Nuova Elettronica | z80ne | z80ne | |
| z80pio | Z80 PIO | | | | | |
| z80scc_channel | Z80 SCC Channel | | | | | |
| z80sio | Z80 SIO | | | | | |
| z80sio_channel | Z80 SIO channel | | | | | |
| z80sti | Mostek MK3801 STI | | | | | |
| z84c015 | Zilog Z84C015 | | | | | |
| z8536 | Zilog Z8536 CIO | | | | | |
| z8601 | Zilog Z8601 | | | | | |
| z8611 | Zilog Z8611 | | | | | |
| z8671 | Zilog Z8671 | | | | | |
| z8681 | Zilog Z8681 | | | | | |
| z8682 | Zilog Z8682 | | | | | |
| z86e02 | Zilog Z86E02 | | | | | |
| z88 | Z88 | 1988 | Cambridge Computers | | | |
| z88_1024k_flash | Z88 1024KB Flash | | | | | |
| z88_1024k_ram | Z88 1024KB RAM | | | | | |
| z88_128k_ram | Z88 128KB RAM | | | | | |
| z88_128k_rom | Z88 128KB ROM | | | | | |
| z88_256k_rom | Z88 256KB ROM | | | | | |
| z88_32k_ram | Z88 32KB RAM | | | | | |
| z88_32k_rom | Z88 32KB ROM | | | | | |
| z88_512k_ram | Z88 512KB RAM | | | | | |
| z88_impexp | Z88 Imp-Export protocol | | | | | |
| z88cart_slot | Z88 Cartridge Slot | | | | | |
| z88ch | Z88 (Swiss) | 1988 | Cambridge Computers | z88 | z88 | |
| z88de | Z88 (German) | 1988 | Cambridge Computers | z88 | z88 | |
| z88dk | Z88 (Danish) | 1988 | Cambridge Computers | z88 | z88 | |
| z88es | Z88 (Spanish) | 1988 | Cambridge Computers | z88 | z88 | |
| z88fi | Z88 (Finnish) | 1988 | Cambridge Computers | z88 | z88 | |
| z88fr | Z88 (French) | 1988 | Cambridge Computers | z88 | z88 | |
| z88it | Z88 (Italian) | 1988 | Cambridge Computers | z88 | z88 | |
| z88no | Z88 (Norwegian) | 1988 | Cambridge Computers | z88 | z88 | |
| z88se | Z88 (Swedish) | 1988 | Cambridge Computers | z88 | z88 | |
| z88tr | Z88 (Turkish) | 1988 | Cambridge Computers | z88 | z88 | |
| z8s180 | Zilog Z8S180 | | | | | |
| z90 | Z-90 | 1981 | Zenith Data Systems | h89 | h89 | |
| z9001 | Z9001 (KC 85/1.10) | 1984 | Robotron | | | |
| zac1b11107 | Zaccaria 1B11107 Sound Board | | | | | |
| zac1b11142 | Zaccaria 1B11142 Sound Board | | | | | |
| zackman | Zackman | 1983 | Bandai | | | |
| zankor | Zankor (TMS5200 Italian speech) | 1986 | Zaccaria | | | genpin |
| zankor2i | Zankor (TMS5220 Italian speech) | 1986 | Zaccaria | zankor | zankor | genpin |
| zapcomp | ZAP - Z80 Applications Processor | 1981 | Steve Ciarcia / BYTE / McGRAW-HILL | | | |
| zaryavos | Zarya Vostoka | 1984 | Nova Games of Canada | | | |
| zarza | Zarza (set 1) | 1982 | Taito do Brasil | | | genpin |
| zarza1 | Zarza (set 2) | 1982 | Taito do Brasil | zarza | zarza | genpin |
| zarzon | Zarzon | 1981 | SNK (Taito America license) | satansat | satansat | vanguard |
| zaviga | Zaviga | 1984 | Data East Corporation | | | |
| zavigaj | Zaviga (Japan) | 1984 | Data East Corporation | zaviga | zaviga | |
| zaxxon | Zaxxon (set 1, rev D) | 1982 | Sega | | | zaxxon |
| zaxxon2 | Zaxxon (set 2, unknown rev) | 1982 | Sega | zaxxon | zaxxon | zaxxon |
| zaxxon3 | Zaxxon (set 3, unknown rev) | 1982 | Sega | zaxxon | zaxxon | zaxxon |
| zaxxonb | Jackson | 1982 | bootleg | zaxxon | zaxxon | zaxxon |
| zaxxonj | Zaxxon (Japan) | 1982 | Sega | zaxxon | zaxxon | zaxxon |
| zdog | ZDog (44 in 1) | 200? | Hummer Technology Co., Ltd. | | | |
| zdrum | Zooty Drum | 2000 | PARA Enterprises | | | |
| zdsupers | SuperSport | 1987 | Zenith Data Systems | ibm5150 | ibm5150 | |
| zdz150 | Z-150 Series | 198? | Zenith Data Systems | ibm5150 | ibm5150 | |
| zdz160 | Z-160 Series | 198? | Zenith Data Systems | ibm5150 | ibm5150 | |
| zdz180 | Z-180 Series | 1987 | Zenith Data Systems | ibm5150 | ibm5150 | |
| zdz248 | Z-248 | 198? | Zenith Data Systems | ibm5170 | ibm5170 | |
| zedblade | Zed Blade / Operation Ragnarok | 1994 | NMK | neogeo | | |
| zeebo | Zeebo (Brazil) | 2009 | Zeebo Inc. | | | |
| zekepeak | Zeke's Peak | 1983 | Taito | icecold | icecold | |
| zektor | Zektor (revision B) | 1982 | Sega | | | |
| zektor_audio | Zektor Sound Board | | | | | |
| zelos | Zelos (Japan, main unit) | 1994 | Namco | | | |
| zelost | Zelos (Japan, terminal) | 1994 | Namco | | | |
| zenponta | Zenigata Ponta (Japan, ver 1.02) | 2005 | Amuzy Corporation | | | |
| zeos386sx | 386 SX-16 | 198? | ZEOS | ibm5170 | ibm5170 | |
| zephy | Zephy (set 1) | 1981 | LTD | | | genpin |
| zephya | Zephy (set 2) | 1981 | LTD | zephy | zephy | genpin |
| zephyr | Zephyr (00-441-01) | 1979 | Zentec | | | |
| zero | Zero (bootleg of Defender, set 1) | 1980 | bootleg (Jeutel) | defender | defender | |
| zero2 | Zero (bootleg of Defender, set 2) | 1980 | bootleg (Amtec) | defender | defender | |
| zerogu2 | Zero Gunner 2 | 2001 | Psikyo | naomi | | |
| zerogun | Zero Gunner (Export, Model 2B) | 1997 | Psikyo | | | |
| zeroguna | Zero Gunner (Export, Model 2A) | 1997 | Psikyo | zerogun | zerogun | |
| zerogunaj | Zero Gunner (Japan, Model 2A) | 1997 | Psikyo | zerogun | zerogun | |
| zerogunj | Zero Gunner (Japan, Model 2B) | 1997 | Psikyo | zerogun | zerogun | |
| zerohour | Zero Hour (set 1) | 1980 | Universal | | | zerohour |
| zerohour_stars | Zero Hour/Red Clash/Space Raider starfield | | | | | |
| zerohoura | Zero Hour (set 2) | 1980 | Universal | zerohour | zerohour | zerohour |
| zerohouri | Zero Hour (bootleg) | 1980 | bootleg (Inder SA) | zerohour | zerohour | zerohour |
| zeropnt | Zero Point (set 1) | 1998 | Unico | | | |