MediaWiki:Sitenotice:
2025-12-29: I have restored the wiki to a backup from the end of November. Starting in September 2025, accesses went form the 800MB-1.2GB range per month to 26GB in September, 42GB in October, and 70GB in November with most accesses originating from China. As soon as I realized what was causing all the access problems in November, I shut it down (it had reached 36GB by then) behind a password/login screen. The database had gotten corrupted, and I tried a restore from just before the spike in access but that didn't work. Thus, end of November. I still have the other daily backups so if there were any important additions in December, let me know and maybe they can be recovered. - Allen H.
Advanced 8-Bit Microprocessor MC6809
This is a guide to understanding the software and hardware aspects of microprocessors, and the design and testing aspects of microprocessor-based systems. It is designed for students, engineers and electronic/computer technicians, and the focus is on the theory and applications of the 8-bit microprocessor, using the Motorola MC6809 as a model example. The chapters contain illustrative worked examples to aid understanding of the material presented, and a range of problems with their worked solutions are also included. The knowledge gained from this text should enable students to design, construct, test and evaluate their own MC6809 microprocessor systems for any desired specifications.