I played Electric Yo-Yo quite a bit back in the arcade days. I always liked the game play. Pretty unique. Can't think of a similar game off hand. Seems to be pretty rare now days. Try it in MAME. The controls are pretty simple, joystick and button, so you can get a good idea of the game just playing it with a keyboard. It's a pretty hard game.
I never played or heard of Kram during the arcade days. Only learned of it after getting into the hobby. I got lucky and one pretty much fell in my lap on a local buy. I like the game play a lot. You can try this one in MAME too to get an idea of it. Another pretty rare game though. I think I've only seen one come across on ebay in all these years.
Taito had a main branch in the Chicago area and the guy that wrote Kram lives about 15 minutes from me. Very nice guy. Good stories about Taito back then.