Pico2-ROM-Emu

Pico2-ROM-Emu is a project designed to emulate 28 pin EEPROM (28C256 compatible) functionality using the Raspberry Pi Pico2 and a fast SRAM.

Theory of Operation

The theory of operation is relatively simple:

1. Assert active-low reset signal
2. Fill SRAM with ROM data using octal latches
3. Hi-Z the latches and de-assert reset
4. SRAM is directly connected to DUT EEPROM socket via ribbon cable

Circuit Schematic

MicroPython Firmware (pico-rom-emu-firmware)

This sub-project contains the firmware written in MicroPython. It is responsible for:

• Copying provided ROM binary images to the embedded SRAM
• Accepting new ROM images over USB serial connection
• Controlling DUT reset signal