Ahoyhoy, ended up patching this all together to help develop ROMS (helped having a robust ROM that still allowed flashing when half of it was messed up), but I figured others might find it useful to have around, or as a usefull all-in-one beginner solution. Happy instaboots =) UniROM combines: -Caetla 0.34 (for catflap/etc over LPT) -X-Flash (for X-Killer over LPT) -PSXSerial 1.3 (for use with PSXSerial over serial) -MYAR (Foo Chen Hong's third party AR style comms) Load with Switch on = Caetla Load with Switch off = UniROM screen @ UniROM screen: - Triangle = Load xFlash (supports XLink/XKiller) - Circle = Load PSXSerial (supports PSXSerial) - Square = Boot to PSX BIOS (supports 24bit colour) - Cross = Caetla's Comms Screen (supports Catflap,etc) - UniROM screen (supports MYAR/PAR protocol) Included in the download: PC Side: - PSXSerial 1.3 (Shadow & Jihad) - MyAR (Foo Chen Hon) - XKiller & GiveIO (Tim Schuerwegen & Sickle) - CatflapIO (Intar Technologies & Orion_) PSX Side: - 326kb Compat version with Caetla for Xplorer FX - 236kb Full version with Caetla for Xplorer/PAR, etc - 136kb Lite version without caetla - ISO With XFlash + All Caetla, All XPlorer, UniROM Lite, UniROM Full (Burn with ImgBurn @ slowest speed, boot with swap trick or whatever) Note: As you might know, Caetla 0.34 can be a bit finnicky on the XplorerFX, if you're using an FX, try flashing the official ROM for the cart first, or flashing one of the other versions, then flashing the compat version via X-Killer. Generally, it's a good idea to flash the rom with the switch ON. Thanks/Credits: (All original authors are credited in the .zip for their respective contributions/) Orion_, Intar Technologies, Foo Chen Hon, Shadow, Jihad/HITMEN, Silpheed/HITMEN, Tim Schuerwegen, Barog/Napalm, Cat, K-Comms, Herben, CybDyn, Type 79, Inc/Lightforce, nocash/no$, TriMesh and all you lovely PSX Peeps. ~Sickle, Apr 2015 http://sicklebrick.com/wp-downloads/sicklebrick.com_unirom_release_01.rar