Schematics, code, and images have been posted that might help someone else working through similar computer architecture problems in the future, e.g. keyboard/LCD interfacing, address decoding, 6502 assembly, working with RAM/ROM, etc.
Programmable via custom microcontroller based platform.
16×2 character LCD display.
PS/2 keyboard support.
Built with 7400 series logic contemporary with the original 6502 CPU.
Are you interested in building vintage microprocessor computers? Let us know in the comments below.
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, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, 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.