6801 68701 & 6803 Microcomputer Programming and Interfacing (1980) - Bugbook. Good condition with the main issues being the lower left corner is dog-eared and the inside page (lower-right once again) is ripped a ruffled a bit. Also, there is are some initials inside the book (upper right hand corner of the title page) for CWG, a former Senior Engineer at Bell Laboratories and Western Electric. However, this is a "First Edition/First Printing" of this work and is also very scarce.