Note 12/24/23 - ArkOS now updated to the latest 12-22-23 version!
Quick Highlights:  Setup beautiful bezels for all (over 10,000 bezels)!  Over 165 vertical arcade setup for vertical orientation of handheld in the MAME2010 system folder (also regular versions of these are in the Arcade folder too, so either way its covered).  The RG503 performs great with this card.
 
For Sale (this listing): One (1) loaded 512 GB micro SD card for your Anbernic RG503 handheld retro game system & ALSO includes one (1) 32 GB card for the TF1 slot (they work together and sold in pairs).  Plug them both in to your RG503 and start gaming!  I took the latest ArkOS 2.0 (as of late December 2023) for the system, added my new and improved superior game libraries with full menu art, added custom bezels for all systems/games, added awesome ports with PortMaster, added themes (see pics for many, - 32 themes preloaded and all fixed to properly display all art work), tons of custom collections, added missing bios files, background music (can be turned off or switched out easily), I optimized certain systems , I added overlays for Vectrex… I turned it in to the very best card set for the RG503 of its size. Includes Sega Naomi, Sammy Atomiswave, Playstation, PSP, Arcade (FBNeo/MAME-2003plus), Dreamcast, Sega CD, among many others as listed in detail.
 
NOTE: The games partition (on larger card) is accessible directly in Windows on a PC for super easy game file  transfers/mods / copying/pasting.
32 awesome themes pre-installed. Also I fixed many features of the themes to have proper artwork, etc.
All themes were fixed to properly display all systems. Some of the themes I added include: EpicMax Cody,  Epic Szalik,  Epic-Noir,  Farfenkugell-Crystal, SagaBox, NES-box, CrazyBoy, Sonic-Spin, Metroid-Spin, CRT CabBlast Rogue/Tifa/Morrigan/Chun-Li, Carbon, Farfenkugell-Columns, Farfenkugell-Lazy, Floyd,Freeplay, GBZ35mod, Heychromey, MegamanBlue, Minimal, SagaArtBook, SagaNX, SagaParagon, SagaSlice, SagaWorld, SpinMaster, StarFoxNeon, Supersweet, Switch, & ZeldaGreen.
 
Approximately 20,000+ quality games including their game artwork and gamelists in the roms directory are installed. Games have video snap previews typical, mixart & wheel/marquee art (logos) typical. Cheats are pre-installed available through the retroarch menu for many popular systems.
 
Below is a detailed listing of what is included with this purchase:   
512 GB Sandisk (class 10) micro SD card loaded and ready to game (for TF2 slot) and ALSO a 32 GB micro SD card for the TF1 slot - for your Anbernic RG503 handheld (Note:  Samsung (EVO Select)) card(s) may be provided instead of the Sandisk brand depending on my stock).  No hardware is included, just the loaded sd cards and a tip sheet.
 
Games have video previews that play too as you scroll down through the game list on each system. Awesome menu background themes loaded which can be easily switched up. Most games allow saving game play at ANY spot within the game typical. Games can be identified as "Favorites" simply. Awesome "Custom Collections" are already setup and can be modified. The Arcade Favorites collections have hundreds of the best arcade games (from the thousand+ on system). Vectrex has awesome transparent overlays that I added which are missing on most systems.
 
I left about 1.7 GB free space on the larger sd card available for smooth operation.
This micro SD card has the following systems on it, and I list the approximate game count below:
System - approx. # Games Installed:
NOTE:  The "**" represents new systems I added, not previously included on my other listings... some unique stuff, was a ton of work to get all the themes setup for them.
 
Amiga - 645
Amiga-CD - 93
Amstrad CPC - 211
**Amstrad GX4000 - 26
Arcade (FBneo) - 1836
Daphne - 13
MAME (Arcade) – 323
**Astrocade - 43
ChannelF - 30
**Mega Duck - 25
Daphne - 12
MAME - 327
MAME 2010 - 169 (All the best vertical games duplicated here but setup for vertical play using right joystick as left stick, i.e. rotate handheld vertically)
Atomiswave – 17
Naomi - 45
3DO - 4
Pokemon Mini - 22
Atari 800 - 345
Atari 2600 - 617
Atari 5200 - 96
Atari 7800 - 58
Atari ST - 305
Atari Jaguar - 56
Atari Lynx - 83
Bandai Wonderswan - 110 + 7 English-translations
Bandai Wonderswan Color - 89 + 11 English-translations
Odyssey2 - 85
PC Engine - 290
PC Engine-CD - 46
TurboGrafx16 - 94
TurboGrafx16-CD - 37
SuperGrafx - 5
Famicom - 386
Famicom Disk System (FDS) - 128
Super Famicom - 509
Nintendo (NES) – 1,481 (784 + 697)
    In submenu: NES Hacks - 697
Sufami - 15
Super Nintendo (SNES) – 1043 (795 + 64 + 145 + 39)
    In submenu: SNES Hacks - 64
    In submenu: SFC English Translations - 145
    In submenu: Satellaview - 39
SNES-CD (MSU1) - 39
Nintendo 64 (N64)  - 302 + 20 N64 Hacks in submenu
Virtual Boy - 25
Gameboy - 834
Gameboy Advance – 1084
    Includes GBA Hacks in submenu
    Includes 25 SGB (Super Game Boy) games in submenu
Gameboy Color – 572
    Includes GBC Hacks in submenu
Nintendo Game & Watch - 52
Nintendo DS (NDS) - 100
SG-1000 - 68
Sega Master System - 277
Sega MegaDrive (Japan) - 191
**Sega Megadrive MSU (MSU-MD) - 20
Sega Genesis - 1,040 (784 + 137 + 34 + 44 + 41) 
    In submenu: Genesis - Sonic Hacks - 137
    In submenu: Genesis Streets of Rage Hacks - 34
    In submenu: Genesis - Misc. Hacks - 44
    In submenu: English Megadrive Translations - 41
Sega CD - 97
Sega Genesis 32x - 34
 Sega Saturn - 66
Sega Dreamcast - 185
**Sega VMU - 50
Sega Game Gear - 259
Neo Geo - 140
NeoGeo Pocket - 9
NeoGeo Pocket Color – 40
OpenBOR - 127
Sony PlayStation 1 (PSX) - 487 games
Sony PSP - 131
Sony PSP Minis - 296
Intellivision - 136
Colecovision - 141
**TIC-80 - 1,031
Vectrex – 25
MSX - 635
MSX2 - 100
ZX Spectrum Sinclair - 182
**X1 (Sharp) - 49
X68000 (Sharp) – 100
Commodore 64 - 712
**VIC-20 (Commodore) - 174
PC-FX - 2
MS-DOS - 84
**TI-99 - 90
Supervision (Watara) - 44
Doom - 8 (Including Brutal Doom)
Wolfenstein 3D - 1
EasyRPG - 6
**Pico-8 - 42
**LowRes NX - 102
Solarus - 9
Ports - 74 - including real gems!
ScummVM - 51
**Tiger LCD - 27
**Uzebox - 61