I was on the original team that developed ABEL, the Data I/O PLD language. I co-authored a book "Digital Design using ABEL" in 1994 that came with a special copy of ABEL version 5.0. I have this book in electronic form. I also have versions of ABEL from 1.0 to 5.0 that run without a dongal. These are DOS versions. I have a mag tape of ABEL 1.0 for VMS (I think.) Xilinx owns the current ABEL software and Prentice Hall owns the copyright on the book. However I will post a copy of my book and a full version of ABEL 5.0 on the web somewhere. I will make the link available on request. ------------------------------- Michael Holley swtpc6800(a)comcast.net www.swtpc.com -------------------------------