I just finished wiring up the NVRAM chips to the computer. They are being addressed by a 8-bit program counter separate from the computer’s control counter. The control matrix changes its control word on the falling edge of the clock pulse. This allows the control to set up the 16-bit word, needed to tell which registers or operations are to be active, for the rising clock pulse.
There are a few problems, however, that have made this a bit more difficult than it should be. Since the NVRAM chips I am using are CMOS driven, the TTL chips do not always provide the correct voltage to address the NVRAM chips correctly. Inversely, the NVRAM chips also have the tenancy to output incompatible voltages in regards to TTL. To remedy this I am using the last of my 8-bit three state buffers to convert the input and output of the chips to higher voltages. After I get the NVRAM chips functioning correctly, I only have to add the input and write/run logic as well as the output and the computer is finished (circuit-wise). I will be designing a steampunk-themed case for the enclosure. The case will be the final step before this project is complete.