Commodore 64, Ultimate-II+ and JiffyDOS 

Thanks and enjoy your Ultimate II+ as much as I do :)

@@c64hobby I had ~8 hours session with this cartridge and what I can tell, I am a little dissapointed. Maybe because I have plenty of cartridges in my collection, like: SD-BOX, Easy Flash 3, Kung Fu Flash and others hardware for c64, like: SD2IEC, pi1541, pi1541 + epyx fast loader cartridge? What I've found, that all my cartridges could be sold to get price of Ultimate II+ L cartridge and adding ~$100 I could get Ultimate 64 motherboard. If I was me, a few months ago, I would sell all my cartridges and add extra $$ to get U64 motherboard instead. But is this retro or emulation? Strange feeling.

You have both options. When you select the ROM file in your flash drive and hit Enter, you can choose "Load Drive ROM". The ROM will then be used until the next reboot happens. If you choose "Set as 1541 ROM" this setting will be stored in the Ultimate II flash memory and then be used on each subsequent reboot until you revert the setting.

@@c64hobby awesom, I put an order for a U II+ L with tape-adapter and the wifi board, hope I'll get it soon and I can get rid of the PI1541 and Kung Fu Flash. Don't get me wrong, but PI1541 do d64 files and Kung Fu Flash CRT, I wanted U II coz it seems it can do booth realy good