What sort of cable will I need?

[emurozii]

Whenever I play NTSC Genesis games on my PAL TV, they're in black and white.

What lead will I need for them to be in normal colour? Will I need a RGB av/scart lead or something?

I'm currently using a standard RYW/AV lead.

[BoringSupreez]

I think it's more likely that you just need an actual NTSC TV than some fancy cord.

[emwearz]

Actually the Megadrive wont output 60hz with color due to the freq of the color crystal, a RGB cable will solve the problem.

EDIT: Sorry are you playing on a 60hz modded Megadrive or are you using a Genesis on a PAL TV, if it's a genesis on a PAL TV then yes, it sounds like your TV does not support 60hz, or if it does you need to switch it to 60hz using the remote!

[Hobie-wan]

If your TV doesn't support NTSC or isn't set to expect it, that's normal for an NTSC signal to end up as fuzzy B&W on a PAL display. Conversly PAL on an NSTC TV will give a picture that rolls.