Implemented the first flight-approved microprocessor-based subsystem for DSP-series satellites. Designed hardware and software for microprocessor-based spacecraft subsystems. Defined system architectures and implementations for project proposals. Designed system and detailed hardware (Schottky & CMOS) for a real-time flight unit from initial proposal through engineering model test. Hired as part of the TRW fellowship program. Completed Four Proposals for Spacecraft HW & SW.

Major Project: Mission Data Message (MDM)

• From Proposal to Engineering Model Test
• Real Time Communications Control System

Software System Design

• Architectural approach
• Software sizing (Final SW @ spec!)
• System Timing

Hardware Design

• System Design for four of five boards
• Detailed Design/ Debug/ Documentation for three boards (250 IC’s)
• Provided guidance for design of fourth board
• Approx four jumpers/ board on Eng’g model (none on processor board - 4hr/IC avg)

Designed for Testability

• One to one mapping between breadboard and Engineering Model (adapter shown above)
• Each board designed to perform well defined functions
• Integration plan provided for HW/ SW stubs to be systematically removed as boards were completed.

Hardware Design Highlights

• CMOS/ I²L/ LS/ S/ SOS
• Programmable wait states
• First TRW 9989 flown

Software Design Highlights

• Interrupt driven system
• Approx 2k lines total code
• Coded to be time independent: permitted testing from DC -> full speed