The original IBM Thinkpad
acontinuouslean.com
acontinuouslean.com
http://logogear.americanid.com/ProductDetail.aspx?pid=42148
Having a vintage one, though, would be like ten times better than having a Field Notes pad (or Moleskine, or one of those rare unruled composition books).
Just the thing to do with my HP-16C.