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insistence to one of the authors (GB) that there should be a reasonable way (especially for students) to build digital systems. This led to a National Science Foundation grant (GY-5160) for undergraduate laboratory equipment which was used to purchase RTM's.

We would also like to thank Professor Angel Jordan, head of the Electrical Engineering Department, and Professor Joseph Traub, head of the Computer Science Department for their support and encouragement. In addition, Mr. Paul Stockhausen, business manager of the Computer Science Department, patiently provided valuable support for this work.

AT CMU there have been a number of students and researchers who have contributed to the modules and to this book A simulator by Messrs. Bhandarkar, Goel, Rege, Schulte, and Staab contributed in -this regard. Mr. Paolo Coraluppi together with Messrs. Berera, Orban, and Philiph set up The PDP-16 laboratory stations at CMU and got the first operational results with the modules in an educational environment.

We have particularly enjoyed the experimentation with the art of textbook production, by using our own computing facility for editing and typesetting -- it being the antithesis of the conventional textbook production process. .. The specific people who used the process and contributed to, the direct production are credited, following the author page. Other than costing less for production, it is also approximately 5 to 10 times faster. The editing and typesetting were done on line using the PDP-1O, in conjunction with the SOS editor and PUB typesetting programs developed at Stanford University. The printing masters were created directly using a Xerox -LDX(Long Distance Xerography) printer which was developed at CMU. The printer has a 200 point/inch resolution and is driven directly by a PDP-11. All characters are thus generated point by point by scanning, and a page is printed in about 10 seconds. The pages are then photoreduced for lithographic offset printing. Professor Raj Reddy led the development of the LDX project. Lee Erman, Richard Neely, George Robertson, Philip Karlton, and Richard Johnsson provided consultation and-programming in making the system convenient to operate . The necessary News. Gothic Roman character sets were formed and input by Janice Karlton.

It is evident that we have had much help with this book. However, we alone remain responsible for the remaining errors and difficulties in the text and problems.

G.B. J.G. A.N.

July, 1972

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