press s and x a bunch and you'll hear it. I thought it might be mattel's football II since the jingle is similar to the touchdown sound, but am not certain. (also mattel supposedly used rockwell chips at least for football I and baseball?) It could be 'long bomb' as well, but that was an early lcd handheld and the process used to make its lcd was crappy, so very few if any examples have the lcd functional anymore (most have died of 'tunnel vision', similar to the powerbook 170 lcds)
"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"