| Name | Description | Year | Manufacturer | Rom | Clone | Sample |
| zombrvn | Zombie Revenge (Rev A) | 1999 | Sega | naomi | | |
| zombrvne | Zombie Revenge (Export) | 1999 | Sega | zombrvn | zombrvn | |
| zombrvno | Zombie Revenge | 1999 | Sega | zombrvn | zombrvn | |
| zon32bit | Zone 32-bit Gaming Console System (Family Sport 41-in-1) | 200? | Ultimate Products (HK) Ltd / Senca | | | |
| zone100 | Zone 100 | 200? | Ultimate Products (HK) Ltd / Jungle's Soft | | | |
| zone3d | Zone 3D | 201? | Zone | | | |
| zone40 | Zone 40 | 2009 | Ultimate Products Ltd. / Waixing | | | |
| zone60 | Zone 60 | 2010 | Ultimate Products (HK) Ltd / Jungle's Soft | | | |
| zone7in1 | Zone 7-in-1 Sports (NTSC) | 200? | Ultimate Products Ltd. | | | |
| zone7in1p | Zone 7-in-1 Sports (PAL) | 200? | Ultimate Products Ltd. | zone7in1 | zone7in1 | |
| zonefamf | Zone Family Fit | 201? | Zone | | | |
| zonefusn | Zone Fusion | 200? | Ultimate Products / Jungle's Soft | | | |
| zonemini | Zone Mini | 200? | Ultimate Products Ltd. / Waixing | | | |
| zoo | Zoo (Ver. ZO.02.D, Aug 27 2004) | 2004 | Astro Corp. | | | |
| zoofari | Zoofari | 2006 | ICE/Play Mechanix | | | |
| zookeep | Zoo Keeper (set 1) | 1982 | Taito America Corporation | | | |
| zookeep2 | Zoo Keeper (set 2) | 1982 | Taito America Corporation | zookeep | zookeep | |
| zookeep3 | Zoo Keeper (set 3) | 1982 | Taito America Corporation | zookeep | zookeep | |
| zookeepbl | Zoo Keeper (bootleg) | 1982 | bootleg | zookeep | zookeep | |
| zoom909 | Zoom 909 | 1982 | Sega | buckrog | buckrog | buckrog |
| zoomania | Zoomania (Version 10.04, set 1) | 200? | Industrias Brasileiras | | | |
| zoomaniaa | Zoomania (Version 10.04, set 2) | 200? | Industrias Brasileiras | zoomania | zoomania | |
| zoomer | Zoomer (Z-PDA / Z-7000) | 1993 | Casio / Tandy | | | |
| zoomer_rtc | Zoomer Real Time Clock | | | | | |
| zooo | Zooo (V2.01JA 2004/04/13 12:00) | 2004 | Success | coh3002t | | |
| zorba | Zorba (Modular Micros) | 1984? | Modular Micros | | | |
| zorba_kbd | Zorba Keyboard | | | | | |
| zorro2 | Zorro-II Bus | | | | | |
| zorro2_slot | Zorro-II slot | | | | | |
| zorroa6 | Zorro (30130611, NSW/ACT) | 2003 | Aristocrat | aristmk6 | | |
| zorroa6a | Zorro (20167511, ASP) | 2006 | Aristocrat | zorroa6 | zorroa6 | |
| zorroa6u | Zorro (0151372, US) | 2005 | Aristocrat | zorroa6 | zorroa6 | |
| zortonbr | Zorton Brothers / Los Justicieros (v1.01) | 1994 | Picmatic | alg_bios | | |
| zortonbr_100 | Zorton Brothers / Los Justicieros (v1.00) | 1993 | Picmatic | zortonbr | zortonbr | |
| zr36057 | Zoran ZR36057-based Enhanced Multimedia Controller | | | | | |
| zr36060 | Zoran ZR36060 Integrated JPEG codec | | | | | |
| zr36110 | Zoran ZR36110 mpeg decoder | | | | | |
| zrt80 | ZRT-80 | 1982 | Digital Research Computers | | | |
| zs01 | Konami ZS01 PIC | | | | | |
| zsbc3 | ZSBC-3 | 1980 | Digital Microsystems | | | |
| zsg2 | ZOOM ZSG-2 | | | | | |
| zsl5500 | Zaurus SL-5500 "Collie" | 2002 | Sharp | | | |
| zsl5600 | Zaurus SL-5600 / SL-B500 "Poodle" | 2002 | Sharp | | | |
| zslc1000 | Zaurus SL-C3000 "Akita" (Japan) | 200? | Sharp | | | |
| zslc3000 | Zaurus SL-C3000 "Spitz" (Japan) | 200? | Sharp | | | |
| zslc500 | Zaurus SL-C500 | 2002 | Sharp | | | |
| zslc750 | Zaurus SL-C750 "Shepherd" (Japan) | 2003 | Sharp | | | |
| zslc760 | Zaurus SL-C760 "Husky" (Japan) | 2004 | Sharp | | | |
| zt8802 | ZT-8802 SBC | 1994 | Ziatech | | | |
| zuanshiw | Zuanshi Wutai (V110II) | 1996 | IGS | | | |
| zudugo | Zudu-go / 2udu-go | 200? | Macro Winners / Waixing | | | |
| zulu | Zulu (Ver. 2.04J, Feb 3 2004) | 2004 | Astro Corp. | zoo | zoo | |
| zunknecta | unknown Zanussi / Necta vending machine | 1992 | Zanussi / Necta | | | |
| zunkyou | Zunzunkyou no Yabou (Japan) | 1994 | Sega | | | |
| zunou | Touch De Zunou (Japan, Rev A) | 2006 | Sega | naomi | | |
| zupapa | Zupapa! | 2001 | SNK | neogeo | | |
| zupapah8 | Zupapa (Italian gambling game) | 200? | <unknown> | | | |
| zvenezia | Venezia (coffee vending machine) | 1995 | Zanussi / Necta | | | |
| zvezda | Zvezda | 1990 | <unknown> | spectrum | spectrum | |
| zwackery | Zwackery | 1984 | Bally Midway | | | |
| zx80 | ZX-80 | 1980 | Sinclair Research Ltd | | | |
| zx81 | ZX-81 | 1981 | Sinclair Research Ltd | | | |
| zx8301 | Sinclair ZX8301 | | | | | |
| zx8302 | Sinclair ZX8302 | | | | | |
| zx97 | ZX97 | 1997 | Wilf Rigter | zx81 | zx81 | |
| zxbus | ZXBUS bus | | | | | |
| zxbus_nemoide | Nemo IDE Controller | | | | | |
| zxbus_neogs | NeoGS / General Sound | | | | | |
| zxbus_slot | ZXBUS slot | | | | | |
| zxbus_smuc | SMUC | | | | | |
| zzblock | Zun Zun Block | 1979 | Taito | | | |
| zzyzzyxx | Zzyzzyxx (set 1) | 1982 | Cinematronics / Advanced Microcomputer Systems | | | |
| zzyzzyxx2 | Zzyzzyxx (set 2) | 1982 | Cinematronics / Advanced Microcomputer Systems | zzyzzyxx | zzyzzyxx | |
| zzzap_audio | Midway 280-ZZZAP Audio | | | | | |