I worked on some entry control systems that used the 4004. Lots of glue indeed. The things had about a 1 x 2 foot circuit board, and most of that was glue. Ran fairly warm too. Critters like to live next to warm circuit boards. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist