CNROM-256 ----- What does the 256 mean?

Tormenter · Post by **Tormenter** » Tue Apr 13, 2010 2:23 pm

Does it mean that the slots only accept up to a 32k chip, or the entire board only allows 32k (Say a 16k prg and 16k chr)

kyuusaku · Post by **kyuusaku** » Tue Apr 13, 2010 2:55 pm

256 = 256 kilobits = 32 kibibytes.

tokumaru · Post by **tokumaru** » Tue Apr 13, 2010 5:05 pm

I didn't know they used these numbers with CNROM boards too, but in NROM boards the number is exclusive to the PRG-ROM chip (128 = 16KB, 256 = 32KB), and there are always 8KB of CHR-ROM.

I imagine that in CNROM boards the number is the maximum size of the PRG-ROM chip too. I don't know if they ever limited the size of the CHR-ROM chip to less than 32KB...

AWal · Post by **AWal** » Wed Apr 14, 2010 6:43 pm

According to NesCartDB, CNROM-128 never existed, so I'd assume they always came with 32KB of PRG-ROM.

Bregalad · Post by **Bregalad** » Thu Apr 15, 2010 1:56 am

On a few boards I've seen there is solder pads that would allow for a 128kbit (16 kB) CNROM RPG. Maybe the -256 boards doesn't have those pads tough.

Post by **tepples** » Thu Apr 15, 2010 8:20 am

How big is Star Force (U) again?