With the experiments from the Digital Design Doohickey Project, which include a 555 timer system clock, a 4-bit binary counter for micro-program decoding, and a CPLD based I/O, along with the Mega-One-8-One ALU project, and the 4-bit architecture experiments done here, we can now begin a new project combining these projects together to create a robust modular 4-bit microprocessor system!