A)

Did they have typewriters?

Yes, they did.

Did they have computers?

No, they didn't

Did they have cars?

Yes, they did

Did they have telephones?

Yes, they did

Did they have compact discs?

No, they didn't

Did they have TVs?

No, they didn't

B)

They hadn't computers 100 years ago, but they had cars

They hadn't compact discs 100 years ago, but they had telephones