Tribute to Louis E. Chall
Lou Chall, our dear friend, valued colleague, and the principal inventor of APA technology, passed away on October 31, 2015. Lou's enduring legacy to our Company and to the semiconductor industry is the Chall Architecture, a brilliantly innovative and visionary IC packaging and communications architecture that overcomes the inherent limitations of the von Neumann design. The Chall Architecture is a distributed processing/memory methodology that is scalable and provides configuration and reconfiguration at the system/fabric/device levels both dynamically and statically. This new design also improves latency and data coherency, overcoming the memory access wall and the power consumption wall that is endemic to the von Neumann architecture.

Lou was an exceptionally gifted engineer - an engineer cubed, who devoted his working life to the advancement of computer science, with particular emphasis on cutting-edge processing techniques and distributed computing. He holds twelve U.S. patents in the field, and is the principal inventor of a thirteenth currently-pending patent application.

Lou proudly served in a Military Intelligence unit of the United States Army during the Korean War. After being honorably discharged from the Army, Lou began a 39 year career with major, publicly-held military and commercial computer systems manufacturers, focusing on the design and development of computer processors and systems. These companies included Burroughs, Lockheed Aircraft, Control Data Corporation, Monolithic Memories, and Ford Aerospace. He also held management and senior staff positions with Varian Data Machines and Micro Data Corporation.

Highlights of Lou's pre-APA career include:

At Burroughs Corporation, Lou held progressively more responsible engineering positions. He was an engineer in the Research & Development Laboratory, where he was part of the team that invented and perfected the bread-board first transistor based, large scale digital computing system constructed of solid state devices. Burroughs sent Lou to Cape Canaveral, Florida (now the Kennedy Space Center) to trouble-shoot and debug a serious malfunction that was delaying a critical missile launch. His success at Cape Canaveral resulted in his assignment to an engineering team that developed key components of the ATLAS ICBM Mod II ground based missile guidance system. Later, he was the Field Research Engineering Development Manager assigned to service deployed ATLAS Mod III missiles. For the rest of his career, Lou would be especially proud of his role in the ATLAS program. Lou's last assignment at Burroughs was as the Design & Development Managing Engineer on a project for the Federal Aviation Authority (FAA).

At Lockheed, Lou was the System Architecture for the development of the first aircraft maintenance recording system for the Douglas Aircraft DC-9. This included flight system test and verification of the proto-type and production system units.

At Varian, Lou was the engineering advisor to the company President for the development of communications interfacing products.

At Control Data Corp., Lou initially served as Development Engineer hired to resolve the "attention interrupt" problem of the IBM buss in the CDC Quad communications system for the IBM Dual 360-65 computer used in the banking industry. Thereafter, Lou was assigned to CDC's Communications Division, where he served as a System Architect to develop a micro-coded Bit Slice Interface made up of 7400 and 74S00 integrated circuit devices of Small Scale Integration (SSI), Medium Scale Integration (MSI) and Large Scale Integration (LSI) devices. On completion of that project, Lou was assigned to CDC's Machine Architecture Division, where he made a significant contribution to the definition of the CDC 1700 micro-programmed interface architecture [a joint development project between National Cash Register (NCR) and CDC].

At Monolithic Memories Corp., Lou was a principal designer of the MMC Bit Slice, including the design for the Carry Look Ahead Control, Interrupt Control, Memory Address Control and the Four Bit Processor Slice 6002.

At Ford Aerospace, Lou initially served as a Senior Hardware Development Engineer for design of the "Multi Mode Target Tracker" (MMTT), which included missile rotational decoupling from carrier-based aircraft. Thereafter, he was the architect of the "Field Programmable Algorithm Development System" (FPADS), software for reprogramming a military helicopter's on-board computer while in-flight and over target using aircraft to ground algorithms. This project was followed by Lou's assignment as System Architect for the control unit on the F-18 Target Designation Pod. His last major assignment at Ford Aerospace was to serve as the Principal System Architect in the In-house Research and Development group, where he spearheaded a project involving selective area deposition of Gallium Arsenide on Silicon (GaAs/Si) to develop eight Giga Hertz (GHz) input and output circuits for high speed interface device circuitry.

Lou retired from Ford Aerospace in 1991, and from then until his death he devoted his prodigious intellect and energies to the development of what is now the Chall Architecture. For the last seven years of his life, Lou served Advanced Processor Architectures, LLC, as Vice President - Technology and as a member of the Company's Board.

Lou Chall was a devoted and loving husband and father, as well as a reliable and ever-helpful neighbor and friend. He touched many lives in a positive and affirming way. He will be sorely missed and never forgotten.

Warren Bennis, a world-renowned expert on leadership and a much-honored business professor and author, once said that "the key to a successful life is for an individual to draw out the best in himself and then to develop his best talents." By this standard, Lou Chall most certainly lived a very successful life.

Advanced Processor Archectures, LLC (APA) 2017