Video Card

As you might know from a previous post, I built Ben Eater’s 8bit TTL CPU on breadboards in the past. The CPU is fully programmable with 16 bytes of memory and 11 Op Codes that can be used to write programs, one instruction per byte. This programming has to be done manually using DIP switches every time the device is powered on. It is a bit tedious as you have to enter instructions in binary for each memory location by hand. I have been learning PCB design and would like to convert this project to a PCB build in the near future. One of the things I would like to add is a program loader that can automatically load programs into the memory on boot. Before implementing this on a PCB, I wanted to have a working prototype that connects with my Breadboard CPU.

This is my second Ben Eater project. In this video series, Ben talks about how VGA signals work and walks us through building a circuit that provides the correct timing of sync signals so that a monitor recognizes the signal and displays an image stored on an EEPROM.