MSX Goa'uld Guardian Angel

⚠️🚨 Warning 🚨⚠️
For firmware 090 check 090 branch

The MSX Goa'uld Guardian Angel for hard tasks.

Wiring

Device	Function	Pin	Connection Note
Tang Nano 20k UART TX	UART TX	79	Connect to RX of RP2040
Tang Nano 20k UART RX	UART RX	80	Connect to TX of RP2040
RP2040 UART TX	UART TX	GPIO 0	Connect to RX of Tang Nano 20k
RP2040 UART RX	UART RX	GPIO 1	Connect to TX of Tang Nano 20k

• 090 and 080 wirings are not compatible
• built only for waveshare RP2040 Zero, builtin LED is GPIO16
• both FPGA and RP2040 must have compatible firmwares together
• Make sure to power Raspberry Pi Pico to MSX 5V power supply to Vout (or Vbus) pin

Build Instructions

Before build, make sure to:

• have pico-sdk with tinyusb library
• check PICO_SDK_PATH environment variable linked to pico-sdk directory

mkdir build && cd build
rm -rf * && cmake -DFAMILY=rp2040 -DBOARD=raspberry_pi_pico -G Ninja .. && cmake --build .

Some ideas

• Scanlines toggle button
• OSD toggle button
• USB Keyboard basic functionalities
• USB Keyboard
• Local Firmware Switching
• Persistent Configuration Files
• USB Gamepad
• Reset button (needs MSX external mod in reset wire, WIP)
• USB Floppy Drives
• USB Mass Storage
• Ethernet USB adapters
• WiFi USB adapters
• BIOS Switching