| Name | Description | Year | Manufacturer | Rom | Clone | Sample |
| royalcrdb | Royal Card (German/Polish, set 3) | 1991 | TAB Austria | royalcrd | royalcrd | |
| royalcrdc | Royal Card (German, set 4) | 1991 | TAB Austria | royalcrd | royalcrd | |
| royalcrdd | Royal Card (German, set 5) | 1991 | TAB Austria | royalcrd | royalcrd | |
| royalcrde | Royal Card (German, set 6) | 1991 | TAB Austria | royalcrd | royalcrd | |
| royalcrdf | Royal Card (Evona, Polish, encrypted) | 1991 | Evona Electronic | royalcrd | royalcrd | |
| royalcrdg | Royal Card (German, set 7, CMC C1030 HW) | 1990 | bootleg | royalcrd | royalcrd | |
| royalcrdh | Royal Card (German, set 8) | 1991 | TAB Austria | royalcrd | royalcrd | |
| royalcrdp | Royal Card v2.0 Professional | 1993 | Digital Dreams | royalcrd | royalcrd | |
| royalcrdt | Royal Card (TAB original) | 1991 | TAB Austria | royalcrd | royalcrd | |
| royale | Royale (set 1) | 198? | <unknown> | | | |
| royalea | Royale (set 2) | 198? | <unknown> | royale | royale | |
| royaljp | Royal Card / Royal Jackpot (with a third draw)(encrypted) | 199? | TAB / Video Klein | royalcrd | royalcrd | |
| royalmah | Royal Mahjong (Falcon bootleg, v1.01) | 1982 | bootleg | royalmj | royalmj | |
| royalmj | Royal Mahjong (Japan, v1.13) | 1981 | Nichibutsu | | | |
| royalngt | Royal Night (Japan 840220 RN 2-00) | 1984 | Royal Denshi | ngtbunny | ngtbunny | |
| royalpk2 | Royal Poker 2 (Network version 3.12) | 1999 | F2 System | | | |
| royalqn | Royal Queen (Japan 841010 RQ 0-07) | 1984 | Royal Denshi | | | |
| royclark | Roy Clark - The Entertainer | 1977 | Fascination Int. | allied | | genpin |
| roylcrdn | Royal Card (Nichibutsu HW) | 1985 | Amusement | | | |
| roylcrdna | Royal Card Part-Two (Nichibutsu HW, Ver. 1.02) | 1982 | Miki Corp. | roylcrdn | roylcrdn | |
| roypok96 | Royal Poker '96 (set 1, v97-3.5) | 1996 | Amcoe | | | |
| roypok96a | Royal Poker '96 (set 2, v98-3.6) | 1996 | Amcoe | roypok96 | roypok96 | |
| roypok96b | Royal Poker '96 (set 3, v98-3.6?) | 1996 | Amcoe | roypok96 | roypok96 | |
| roypok96c | Royal Poker '96 (set 4, C3 board) | 1996 | Amcoe | roypok96 | roypok96 | |
| rp200 | GEM RealPiano RP200 | 1999 | Generalmusic | | | |
| rp2a03 | Ricoh RP2A03 | | | | | |
| rp2a03_core | Ricoh RP2A03 core | | | | | |
| rp2a03_core_swap_op_d5_d6 | RP2A03 core with swapped D5/D6 | | | | | |
| rp2a03g | Ricoh RP2A03G | | | | | |
| rp2c33_snd | Ricoh RP2C33 (sound) | | | | | |
| rp5c01 | Ricoh RP5C01 RTC | | | | | |
| rp5c15 | Ricoh RP5C15 RTC | | | | | |
| rp5h01 | RP5H01 6/7-bit Counter | | | | | |
| rpanic | Rolling Panic (v2.33) | 1992 | Excellent System / Jaleco | d9final | d9final | |
| rpatrol | River Patrol (Japan) | 1981 | Orca | | | |
| rpatrolb | River Patrol (bootleg) | 1981 | bootleg | rpatrol | rpatrol | |
| rpatroln | River Patrol (Japan, unprotected) | 1981 | Orca | rpatrol | rpatrol | |
| rpc600 | Risc PC 600 | 1994 | Acorn | | | |
| rpc700 | Risc PC 700 | 1994 | Acorn | rpc600 | rpc600 | |
| rpc86 | RPC 86 | 19?? | Intel | | | |
| rpunch | Rabbit Punch (US) | 1987 | V-System Co. (Bally/Midway/Sente license) | rabiolep | rabiolep | |
| rranger | Rough Ranger (v2.0) | 1988 | SunA (Sharp Image license) | sranger | sranger | |
| rrangerb | Rough Ranger (v2.0, bootleg) | 1988 | bootleg | sranger | sranger | |
| rriders | Ring Riders (Software version v2.2) | 2004 | Gaelco | | | |
| rrreveng | Road Riot's Revenge (prototype, Sep 06, 1994) | 1993 | Atari Games | | | |
| rrrevenga | Road Riot's Revenge (prototype, Jan 27, 1994, set 1) | 1993 | Atari Games | rrreveng | rrreveng | |
| rrrevengb | Road Riot's Revenge (prototype, Jan 27, 1994, set 2) | 1993 | Atari Games | rrreveng | rrreveng | |
| rrvac | Ridge Racer V Arcade Battle (RRV3 Ver. A) | 2000 | Namco | sys246 | | |
| rrvac1 | Ridge Racer V Arcade Battle (RRV1 Ver. A) | 2000 | Namco | rrvac | rrvac | |
| rrvac2 | Ridge Racer V Arcade Battle (RRV2 Ver. A) | 2000 | Namco | rrvac | rrvac | |
| rs_l6 | Red and Ted's Road Show (L-6) | 1994 | Williams | | | |
| rs_la4 | Red and Ted's Road Show (La-4) | 1994 | Williams | rs_l6 | rs_l6 | |
| rs_la5 | Red and Ted's Road Show (La-5) | 1994 | Williams | rs_l6 | rs_l6 | |
| rs_lx2 | Red and Ted's Road Show (Lx-2) | 1994 | Williams | rs_l6 | rs_l6 | |
| rs_lx3 | Red and Ted's Road Show (Lx-3) | 1994 | Williams | rs_l6 | rs_l6 | |
| rs_lx4 | Red and Ted's Road Show (Lx-4) | 1994 | Williams | rs_l6 | rs_l6 | |
| rs_lx5 | Red and Ted's Road Show (Lx-5) | 1994 | Williams | rs_l6 | rs_l6 | |
| rs_pa2 | Red and Ted's Road Show (PA-2 prototype) | 1994 | Williams | rs_l6 | rs_l6 | |
| rs_serial_printer | Radio Shack Serial Printer | | | | | |
| rs128 | RS 128 | 1984 | Memotech Ltd | mtx512 | mtx512 | |
| rs2030 | RS2030 | 1989 | MIPS | | | |
| rs232 | RS-232 Port | | | | | |
| rs232_densei_ups | RS232 Densei UPS | | | | | |
| rs232_loopback | RS-232 Loopback | | | | | |
| rs232_mouse_hle_logitech | Logitech 3-Button Serial Mouse (HLE) | | | | | |
| rs232_mouse_hle_msft | Microsoft 2-Button Serial Mouse (HLE) | | | | | |
| rs232_mouse_hle_msystems | Mouse Systems Non-rotatable Mouse (HLE) | | | | | |
| rs232_mouse_hle_rotatable | Mouse Systems Rotatable Mouse (HLE) | | | | | |
| rs232_mouse_hle_sgi | SGI IRIS Indigo Mouse (HLE) | | | | | |
| rs232_mouse_hle_wheel | Microsoft Serial Mouse with Wheel (HLE) | | | | | |
| rs232_patch_box | RS-232 Patch Box | | | | | |
| rs232_sync_io | RS-232 Synchronous I/O | | | | | |
| rs3230 | Magnum 3000 | 1990 | MIPS | | | |
| rs6k7009 | RS/6000 Type 7009 Model C10 Server | 1994 | International Business Machines | | | |
| rs70_648 | RS-70 648-in-1 | 2019 | CoolBoy | | | |
| rsgun | Radiant Silvergun (JUET 980523 V1.000) | 1998 | Treasure | stvbios | | |
| rshark | R-Shark | 1995 | Dooyong | | | |
| rshark_rom_tilemap | R-Shark ROM Tilemap | | | | | |
| rsp | Nintendo & SGI Reality Signal Processor RSP | | | | | |
| rst_neg_buffer | RST Interrupt Buffer (negative modification) | | | | | |
| rst_pos_buffer | RST Interrupt Buffer (positive modification) | | | | | |
| rt1715 | Robotron PC-1715 | 1986 | Robotron | | | |
| rt1715lc | Robotron PC-1715 (latin/cyrillic) | 1986 | Robotron | rt1715 | rt1715 | |
| rt1715w | Robotron PC-1715W | 1986 | Robotron | rt1715 | rt1715 | |
| rtc3430040 | Apple 343-0040 clock/PRAM | | | | | |
| rtc3430042 | Apple 343-0042-B clock/PRAM | | | | | |
| rtc4543 | Epson R4543 RTC | | | | | |
| rtc4553 | Epson RTC-4553 RTC/SRAM | | | | | |
| rtc62421 | Epson RTC-62421 RTC | | | | | |
| rtc62423 | Epson RTC-62423 RTC | | | | | |
| rtc65271 | Epson RTC-65271 RTC | | | | | |
| rtc72421 | Epson RTC-72421 RTC | | | | | |
| rtc72423 | Epson RTC-72423 RTC | | | | | |
| rtc9701 | Epson RTC-9701-JE RTC/EEPROM | | | | | |
| rthun2 | Rolling Thunder 2 | 1990 | Namco | | | |
| rthun2j | Rolling Thunder 2 (Japan) | 1990 | Namco | rthun2 | rthun2 | |
| rthunder | Rolling Thunder (rev 3) | 1986 | Namco | | | |
| rthunder0 | Rolling Thunder (oldest) | 1986 | Namco | rthunder | rthunder | |
| rthunder1 | Rolling Thunder (rev 1) | 1986 | Namco | rthunder | rthunder | |
| rthunder2 | Rolling Thunder (rev 2) | 1986 | Namco | rthunder | rthunder | |
| rthundera | Rolling Thunder (rev 3, hack) | 1986 | bootleg | rthunder | rthunder | |
| rtl8019a | RTL8019A Ethernet Controller | | | | | |
| rtl8029as_pci | Realtek RTL8029AS Full-Duplex Ethernet | | | | | |
| rtl8139_pci | Realtek RTL8139 PCI Fast Ethernet Adapter card | | | | | |
| rtpc_iocc | IBM RT PC I/O Channel Converter/Controller | | | | | |
| rtpc_kbd | IBM RT PC Keyboard | | | | | |
| rtpc_kbd_con | RT PC keyboard connector | | | | | |
| rtpc010 | IBM RT PC Model 010 | 1986 | International Business Machines | | | |
| rtpc015 | IBM RT PC Model 015 | 1986 | International Business Machines | | | |
| rtpc020 | IBM RT PC Model 020 | 1986 | International Business Machines | | | |
| rtpc025 | IBM RT PC Model 025 | 1986 | International Business Machines | | | |
| rtpca25 | IBM RT PC Model A25 | 1986 | International Business Machines | | | |
| rtriv | Romar Triv | 198? | Romar | | | |
| rtvgc300 | Retro TV Game Console - 300 Games | 2016 | Lexibook | | | |
| rtvgc300fz | Retro TV Game Console - Frozen - 300 Games | 2017 | Lexibook | | | |
| rtype | R-Type (World) | 1987 | Irem | | | |
| rtype2 | R-Type II (World) | 1989 | Irem | | | |
| rtype2j | R-Type II (Japan) | 1989 | Irem | rtype2 | rtype2 | |
| rtype2jc | R-Type II (Japan, revision C) | 1989 | Irem | rtype2 | rtype2 | |
| rtype2m82b | R-Type II (Japan, bootleg M82 conversion) | 1997 | bootleg | rtype2 | rtype2 | |
| rtypeb | R-Type (World bootleg) | 1987 | bootleg | rtype | rtype | |
| rtypej | R-Type (Japan) | 1987 | Irem | rtype | rtype | |
| rtypejp | R-Type (Japan prototype) | 1987 | Irem | rtype | rtype | |
| rtypeleo | R-Type Leo (World) | 1992 | Irem | | | |
| rtypeleoj | R-Type Leo (Japan) | 1992 | Irem | rtypeleo | rtypeleo | |
| rtypem82b | R-Type (Japan, bootleg M82 conversion) | 2009 | bootleg | rtype | rtype | |
| rtypeu | R-Type (US) | 1987 | Irem (Nintendo of America license) | rtype | rtype | |
| rubymag | Ruby Magic (10125711, NSW/ACT) | 2002 | Aristocrat | aristmk6 | | |
| rubymaga | Ruby Magic (10148811, ASP) | 2003 | Aristocrat | rubymag | rubymag | |
| rugby | Rugby? (four roses hardware) | 1999 | C.M.C. | | | |
| rugrats | Rug Rats | 1983 | Nichibutsu | wiping | wiping | |
| rulechab | Super Ball (Version EC-3.50 N165) | 1991 | ElectroChance | | | |
| rulechan | Super Ball (Version EC-3.50 N322) | 1991 | ElectroChance | | | |
| rumba | Rumba Lumber (rev 1) | 1984 | Taito | | | |
| rumblef | The Rumble Fish | 2004 | Sammy / Dimps | awbios | | |
| rumblef2 | The Rumble Fish 2 | 2005 | Sammy / Dimps | awbios | | |
| rumblefp | The Rumble Fish (prototype) | 2004 | Sammy / Dimps | rumblef | rumblef | |
| rumblf2p | The Rumble Fish 2 (prototype) | 2005 | Sammy / Dimps | rumblef2 | rumblef2 | |
| rumbreel | Rumble Reels (20288611, NSW/ACT) | 2010 | Aristocrat | aristmk6 | | |
| runark | Runark (Japan) | 1990 | Taito Corporation | growl | growl | |
| runaway | Runaway (Atari, prototype) | 1982 | Atari | | | |
| runaways | Runaway (Sun Electronics, Japan) | 1979 | Sun Electronics | | | dai3wksi |
| rundeep | Run Deep | 1988 | Cream Co., Ltd. | thedeep | thedeep | |
| rungun | Run and Gun (ver EAA 1993 10.8) | 1993 | Konami | | | |
| rungun2 | Run and Gun 2 (ver UAA) | 1996 | Konami | konamigx | | |
| runguna | Run and Gun (ver EAA 1993 10.4) | 1993 | Konami | rungun | rungun | |
| rungunad | Run and Gun (ver EAA 1993 10.4) (dual screen with demux adapter) | 1993 | Konami | rungun | rungun | |
| rungunb | Run and Gun (ver EAA 1993 9.10, prototype?) | 1993 | Konami | rungun | rungun | |
| rungunbd | Run and Gun (ver EAA 1993 9.10, prototype?) (dual screen with demux adapter) | 1993 | Konami | rungun | rungun | |
| rungund | Run and Gun (ver EAA 1993 10.8) (dual screen with demux adapter) | 1993 | Konami | rungun | rungun | |
| rungunua | Run and Gun (ver UBA 1993 10.8) | 1993 | Konami | rungun | rungun | |
| rungunuad | Run and Gun (ver UBA 1993 10.8) (dual screen with demux adapter) | 1993 | Konami | rungun | rungun | |
| rungunud | Run and Gun (ver UAB 1993 10.12, dedicated twin cabinet) | 1993 | Konami | rungun | rungun | |
| runpuppy | Run Run Puppy | 2000 | Konami | | | |
| runrun | Run Run (Do! Run Run bootleg) | 1984 | bootleg | dorunrun | dorunrun | |
| ruprup | Roll Up! Roll Up!! (10115911, NSW/ACT) | 2002 | Aristocrat | aristmk6 | | |
| rush | Rush (1.0) | 20?? | Dave Astill | | | |
| rushatck | Rush'n Attack (US) | 1985 | Konami | gberet | gberet | |
| rushbets | Rushing Beat Shura (SNES bootleg) | 1997 | bootleg | | | |
| rushcrsh | Rush & Crash (Japan) | 1986 | Capcom | srumbler | srumbler | |
| rushhero | Rushing Heroes (ver UAB) | 1996 | Konami | konamigx | | |
| rushrst | Rushin Rooster (0100534V, NSW/ACT) | 1997 | Aristocrat | chickna5 | chickna5 | |
| rvoicepc | Realvoice PC | 1988? | Adaptive Communication Systems | | | |
| rvrbt_l3 | Riverboat Gambler (L-3) | 1990 | Williams | | | genpin |
| rvrbt_p7 | Riverboat Gambler (PA-7) | 1990 | Williams | rvrbt_l3 | rvrbt_l3 | genpin |
| rvschool | Rival Schools: United By Fate (Europe 971117) | 1997 | Capcom | coh3002c | | |
| rvschoola | Rival Schools: United By Fate (Asia 971117) | 1997 | Capcom | rvschool | rvschool | |
| rvschoolu | Rival Schools: United By Fate (USA 971117) | 1997 | Capcom | rvschool | rvschool | |
| rw10r | 10R (Rockwell) | 1974 | Rockwell | | | |
| rw12r | 12R: Square Root | 1975 | Rockwell | | | |
| rw18r | 18R: Memory | 1975 | Rockwell | | | |
| rw24k | 24K (Rockwell) | 1976 | Rockwell | | | |
| rw30r | 30R: Slide Rule Memory (B5500 version) | 1974 | Rockwell | | | |
| rw31r | 31R: Slide Rule Memory | 1975 | Rockwell | rw30r | rw30r | |
| rwtrntcs | Rowtron Television Computer System | 1979 | Rowtron | | | |
| rx01 | RX01 Floppy Disk Controller | | | | | |
| rx01_cpu | DEC RX01 CPU | | | | | |
| rx15 | RX15 Digital Rhythm Programmer | 1984 | Yamaha | | | |
| rx78 | Gundam RX-78 | 1983 | Bandai | | | |
| rygar | Rygar (US set 1) | 1986 | Tecmo | | | |
| rygar2 | Rygar (US set 2) | 1986 | Tecmo | rygar | rygar | |
| rygar3 | Rygar (US set 3 Old Version) | 1986 | Tecmo | rygar | rygar | |
| rygarj | Argus no Senshi (Japan set 1) | 1986 | Tecmo | rygar | rygar | |
| rygarj2 | Argus no Senshi (Japan set 2) | 1986 | Tecmo | rygar | rygar | |
| ryorioh | Gourmet Battle Quiz Ryohrioh CooKing (Japan) | 1998 | Visco | | | |
| ryouran | VS Mahjong Otome Ryouran (revision 2) | 1998 | Electro Design | skns | | |
| ryourano | VS Mahjong Otome Ryouran (revision 1) | 1998 | Electro Design | ryouran | ryouran | |
| ryujin | Ryu Jin (Japan, ET910000B PCB) | 1993 | Taito Corporation | | | |
| ryujina | Ryu Jin (Japan, ET910000A PCB) | 1993 | Taito Corporation | ryujin | ryujin | |
| ryukendn | Ninja Ryukenden (Japan, set 1) | 1989 | Tecmo | shadoww | shadoww | |
| ryukendna | Ninja Ryukenden (Japan, set 2) | 1989 | Tecmo | shadoww | shadoww | |
| ryukobou | Mahjong Ryukobou (Japan, V030J) | 1995 | IGS / Alta | lhb | lhb | |
| ryukyu | RyuKyu (Rev A, Japan) (FD1094 317-5023A) | 1990 | Success / Sega | | | |
| ryukyua | RyuKyu (Japan) (FD1094 317-5023) | 1990 | Success / Sega | ryukyu | ryukyu | |
| ryukyud | RyuKyu (Japan) (bootleg of FD1094 317-5023 set) | 1990 | bootleg | ryukyu | ryukyu | |
| ryuuha | Ryuuha (Japan 871027) | 1987 | Central Denshi | iemoto | iemoto | |
| rz1 | RZ-1 | 1986 | Casio | | | |
| rzbatfor | R-Zone: Batman Forever | 1995 | Tiger Electronics | | | |
| rzindy500 | R-Zone: Indy 500 | 1996 | Tiger Electronics | | | |
| rztoshden | R-Zone: Battle Arena Toshinden | 1996 | Tiger Electronics | | | |
| s_dsp | Nintendo/Sony S-DSP | | | | | |
| s_smp | Nintendo/Sony S-SMP | | | | | |
| s10 | S-10 Digital Sampling Keyboard | 1986 | Roland | | | |
| s100_8k_sc | Seals 8K SC Memory Board | | | | | |
| s100_8k_sc_bb | Seals 8K SC Memory Board with Battery Backup | | | | | |
| s100_am310 | Alpha Micro AM-310 Communications Controller | | | | | |
| s100_bus | S100 bus | | | | | |
| s100_djdma | Morrow Disk Jockey/DMA FDC | | | | | |
| s100_mm65k16s | Morrow MM65K16S | | | | | |
| s100_nsmdsa | North Star MDS-A | | | | | |
| s100_nsmdsad | North Star MDS-A-D | | | | | |
| s100_sj2db | Morrow Disk Jockey 2D/B | | | | | |
| s100_slot | S100 slot | | | | | |
| s100_wunderbus | Morrow Winderbus I/O | | | | | |
| s11_bg | Williams System 11 Background Audio Board | | | | | |
| s11_bgm | Williams System 11 Background Sound/Music Board | | | | | |
| s11_bgs | Williams System 11 Background Sound Board | | | | | |
| s11_obg | Williams System 11 (Older) Background Audio Board | | | | | |
| s11c_bg | Williams System 11C Background Audio Board | | | | | |
| s14001a | SSi TSI S14001A | | | | | |
| s1410 | Xebec S1410 | | | | | |
| s16lf01 | Samsung 16LF01 Series VFD | | | | | |
| s1945 | Strikers 1945 (World) | 1995 | Psikyo | | | |
| s1945a | Strikers 1945 (Japan / World) | 1995 | Psikyo | s1945 | s1945 | |
| s1945bl | Strikers 1945 (Hong Kong, bootleg) | 1995 | bootleg | s1945 | s1945 | |
| s1945ii | Strikers 1945 II | 1997 | Psikyo | | | |
| s1945iii | Strikers 1945 III (World) / Strikers 1999 (Japan) | 1999 | Psikyo | | | |
| s1945iiibl | Strikers 1945 III (World) / Strikers 1999 (Japan) (bootleg, set 1) | 1999 | bootleg | s1945iii | s1945iii | |
| s1945iiibla | Strikers 1945 III (World) / Strikers 1999 (Japan) (bootleg, set 2) | 1999 | bootleg | s1945iii | s1945iii | |
| s1945j | Strikers 1945 (Japan) | 1995 | Psikyo | s1945 | s1945 | |
| s1945k | Strikers 1945 (Korea) | 1995 | Psikyo | s1945 | s1945 | |
| s1945n | Strikers 1945 (World, unprotected) | 1995 | Psikyo | s1945 | s1945 | |
| s1945nj | Strikers 1945 (Japan, unprotected) | 1995 | Psikyo | s1945 | s1945 | |
| s1945p | Strikers 1945 Plus | 1999 | Psikyo | neogeo | | |
| s1c33209 | Epson S1C33209 | | | | | |
| s1c33221 | Epson S1C33221 | | | | | |
| s1c33222 | Epson S1C33222 | | | | | |
| s220 | S-220 Digital Sampler | 1987 | Roland | | | |
| s2636 | Signetics 2636 PVI | | | | | |
| s2650 | Signetics 2650 | | | | | |
| s29190_16 | Serial EEPROM S29190 (64x16) | | | | | |
| s29290_16 | Serial EEPROM S29290 (128x16) | | | | | |
| s29390_16 | Serial EEPROM S29390 (256x16) | | | | | |
| s3_764 | Number Nine 9FX Vision 330 (S3 764) | | | | | |
| s3_86c764_vga | S3 86c764 Trio64 VGA i/f | | | | | |
| s3_86c864_vga | S3 86c864 Vision864 VGA i/f | | | | | |
| s3_86c964_vga | S3 86c964 Vision964 VGA i/f | | | | | |
| s3_86c968_vga | S3 86c968 Vision968 VGA i/f | | | | | |
| s32comm | System 32 Communication Board | | | | | |
| s3520cf | Seiko Epson S-3520CF RTC | | | | | |