There are a total of 16 pins I need to control and the Arduino Mega is great for this job as it has enough digital pins. There are also 3 control lines for the Write Enable, Output Enable, and Chip Enable pins specifically, that I needed to redirect to the Arduino as well. The first step was to solder a bunch of wires for the address and data bus. I decided to use an Arduino shield with a ROM socket to flash a ROM file from my computer to the EEPROM. The EEPROM chip that I'm using is the AT28C25615U from ATMEL. The goal of this project is to provide a way to flash a ROM file in an EEPROM chip using an Arduino Mega. The plan is to build a very simple computer using one of these CPUs, a ROM, RAM, IO, Serial, and other logic chips. ![]() The 6502 and the z80 CPUs started the personal computer revolution back in the 70s and 80s. ![]() I started following the Ben Eater's awesome tutorials to create my own retro computer using chips from the golden age of PCs.
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