For the control matrix of my computer I am using some NVRAM chips to store a 16-bit control word for the various registers and control wires of my CPU. I decided not to use EEPROM as the chips that I bought were all faulty and wouldn’t write (I consulted many people and they agreed). I also decided that moving breadboard wires around was an extremely inefficient way to program 70 control words at 70 addresses. Which is why I decided to create a simple NVRAM (or EEPROM) programmer using the Arduino to send out addresses and data as well as control the write enable pin. My sketch cycles through bytes of data in an array of a specified length. My code is available for anyone who would find it useful, it can be modified quite easily for your programming needs.
The aptly-named 8 Bit Spaghetti blog chronicles a TTL logic journey encompassing many breadboards. The Arduino-powered NVRAM programmer is handy and uses an Adafruit Protoshield!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
