Now that Sim City NES is out, there appear to be emulation problems with MMC5. From the title screen all the way up until the the scenario/practice maps load, the graphics are garbage, possibly due to flaws in the bank switching for MMC5. on Nestopia UE, it's the reverse. Only the map, when the scenario is loaded, shows garbage graphics. FCEUX can emulate the game perfectly (SO FAR, from what I tested, that is), showing no corrupt graphics, which rules out my suspicion that the dump was bad. Any other emulator, is anyone's guess.
This just a heads up. I don't know if this could be fixed in the next few updates, as the game could be using some part of MMC5 that was never utilized by any released game.
EDIT: This was on OS v20-RC7 IIRC, as I don't remember which v20 RC version I had. Tested on an Original Famicom.
Here's the ROM image data, taken from Nestopia UE:
File: Sim City (USA) (Proto).nes
Directory: H:\Famicom\ROMS\Protos\
Soft-patched: No
CRC: FDC7C50B
SHA-1: 5E8F67BEFB2B1BCBD0384E3144ACB2766FC3E443
System: NES-NTSC
Board: EKROM, Mapper 5
PRG-ROM: 128k
CHR-ROM: 128k
W-RAM: 8k
Solder Pad: H:1 V:0
Battery: Yes
File: Sim City (USA) (Proto).sav
Directory: H:\EDFC\SAVE\
Dump: Unknown